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English prepositions take only a small proportion of the language but play a substantial role. Although prepositions are of course also frequently used in English textbooks for secondary school, students fail to incidentally acquire them and often show low achievements in using prepositions correctly. The strategy commonly employed by language instructors is teaching the multiple senses of prepositions by rote which fails to help the students to draw links between the different meanings in usage. New findings in Cognitive Linguistics (CL) suggest a different approach to teaching prepositions and thus might have a strong impact on the methodologies of foreign language teaching and learning on the aspects of meaningful learning. Based on the Theory of Domains (Langacker, 1987), the notions of image schemas (Johnson, 1987) as well as the Conceptual Metaphor Theory (Lakoff & Johnson, 1980), the present study developed a CL-inspired approach to teaching prepositions, which was compared to the traditional teaching method by an empirical study conducted in a German school setting. Referring to the participants from the higher track and the medium track, who are at different proficiency levels, the results indicate that the CL-inspired teaching approach improved students" performance significantly more than the traditional approach in all the cases for the higher track and in some cases for the medium track. Thus, these findings open up a new perspective of the CL-inspired meaningful learning approach on language teaching. In addition, the CL-inspired approach demonstrates the unification of the integrated model of text and picture comprehension (the ITPC model) in integrating the new knowledge with related prior knowledge in the cognitive structure. According to the learning procedure of the ITPC model, the image schema as visual image is first perceived through the sensory register, then is processed in the working memory by conceptual metaphor, and finally it is integrated with cognitive schemata in the long term memory. Moreover, deep-seated factors, such as transfer of mother tongue, the difficulty of teaching materials, and the influence of prior knowledge, have strong effects on the acquisition of English prepositions.
Grundwasser ist eine lebenswichtige Ressource und gleichzeitig ein thermisch stabiler Lebensraum mit einer außergewöhnlichen Fauna. Aufgrund der Klimageschichte der letzten ca. 1,8 Millionen Jahre in Mitteleuropa war die Ausgangshypothese, dass die meisten Grundwasserarten an Temperaturen unterhalb von 14 °C angepasst sind und sich Temperaturerhöhungen daher negativ auf die Grundwasserfauna auswirken.
Um die Folgen einer Klimaerwärmung in situ beurteilen zu können, wurden anthropogen erwärmte Grundwässer als Modelle herangezogen. In ersten Teil dieser Arbeit wurden die Crustaceagemeinschaften natürlich temperierter und anthropogen erwärmter Standorte untersucht. Dazu wurden insgesamt 70 Grundwassermessstellen im Oberrheingraben über ein Jahr (2011 bis 2012) sechsmal beprobt. Ergänzend zu diesem synökologischen Ansatz wurde in einem zweiten Teil die Temperaturpräferenz ausgewählter Arten überprüft. Für diese autökologische Betrachtung wurde ein deutschlandweiter Datensatz herangezogen.
Die ausgewählten Untersuchungsgebiete haben sich als geeignete Modelle für die prognostizierten Temperaturerhöhungen herausgestellt. Die Temperatur erwies sich als einer der wichtigsten Parameter für die Crustaceagemeinschaften. Erwärmungen beeinflussen die Zusammensetzung der Gemeinschaften und die Diversität. Dabei zeigte sich, dass es artspezifisch unterschiedliche Temperaturpräferenzen gibt. Einige vermutlich weniger streng stygobionte Arten scheinen höhere Temperaturen zu tolerieren. Der Großteil der stygobionten Grundwasserarten bevorzugt allerdings Temperaturen unterhalb von 14 °C, wobei wenige Arten als „extrem kalt¬steno-therm“ einzustufen sind. Diese Arten wurden an Standorten nachgewiesen, die aufgrund der hydrologischen Verhältnisse relativ kühl sind und der Fauna auch zukünftig als kalte Refugien Schutz bieten könnten. Einer dieser Standorte ist aufgrund seiner Artenvielalt als „Hot Spot“ einzustufen. Die Ergebnisse legen nahe, dass vor allem kaltstenotherme Arten durch eine Klimaerwärmung und anthropogene Wärmeeinträge gefährdet sind.
Die Untersuchung zeigt, dass Grundwasserlebensräume vor Temperaturerhöhungen zu bewahren sind. Lokale anthropogene Wärmeeinträge sollten keine dauerhafte und großflächige Grundwassererwärmung über 14 °C zur Folge haben. Thermische Ein-träge sollten überwacht und bewertet werden. Es wird empfohlen, die bestehenden rechtlichen Rahmenbedingungen den ökologischen Erfordernissen anzupassen.
The digital transformation of the public sector and the development of suitable implementation mechanisms are currently major challenges in the area of E-Government. While Germany is one of the leading countries in the private sector in terms of digital offerings, the digital transformation processes in the public sector are progressing only slowly. In particular, compared to other European countries, German administrations offer few digital and interoperable services, which prevents them from catching up with a government-wide dig-ital transformation.
The aim of this dissertation is to investigate the reasons for the slow progress of digital transformation in the public sector and to understand why Germany is not making significant progress in the digitization of administrative services compared to other European member states. Furthermore, it aims to gradually build a comprehensive understanding of why digital transformation is not being driven, supported or applied in the public sector and what positive or negative factors ultimately prevent cross-organizational exchange.
The focus of this dissertation is on organizational and interdisciplinary collaboration in socio-technical systems and its influence on the digital transformation of public administrations. The investigation of science and practice is based on the principles of qualitative social research and qualitative content analysis according to Mayring. Deductive categories are systematically derived and supplemented by further inductive categories along the empirical investigation in the five case studies.
The identified phenomena are analyzed in a scientific explanatory model and described with the help of the holistic approach and the actor-network theory. On this basis, solutions are developed that can either prevent or at least reduce the influencing factors. An interdiscipli-nary approach that combines theoretical foundations from business informatics, administrative informatics/e-government and organizational science not only creates a comprehensive understanding of the problem, but also develops approaches for the scientific description of informatics phenomena with the help of social constructivist approaches.
In Anbetracht der steigenden Scheidungszahlen und der damit immer höher werdenden Zahl betroffener Kinder, erscheint eine Trennung und Scheidung als eine der größten pädagogischen Herausforderungen der Gegenwart (vgl. Figdor, 2000, S. 89). Der Beginn der Scheidungsforschung war durch eine Defizitperspektive geprägt und bewertete die elterliche Scheidung, die sogenannten "broken homes" (vgl. Lexikon der Psychologie), als eine Abweichung von der "Normalfamilie", als generelles Entwicklungsrisiko für Kinder (vgl. Schwarz und Noack, 2002, S. 316). Eine Trennung und Scheidung zählt heute längst nicht mehr zu den familiären Ausnahmesituationen. Gegenwärtig werden in Deutschland circa 50 Prozent der Ehen geschieden. Doch nicht zwangsläufig führt diese Erfahrung zu Traumatisierungen und Entwicklungsbeeinträchtigungen der betroffenen Kinder, sondern kann Entwicklungschancen mit sich bringen.
In der Wissenschaft besteht heute Konsens darüber, dass eine elterliche Trennung und Scheidung zahlreiche negative Folgen für die Entwicklung der Kinder haben kann, aber nicht muss (vgl. Nave-Herz, 2009, S. 96). Unter welchen Voraussetzungen führt nun die Scheidung der Eltern nicht zu negativen Langzeitfolgen der Kinder? Welche Faktoren beeinflussen das Scheidungserleben? Wie bewältigen Kinder das Scheidungsgeschehen und was hilft ihnen im Umgang mit der Problemsituation? Die Motivation zur Bearbeitung dieser Forschungsfragen entstand zum einen durch zahlreiche persönliche Begegnungen mit betroffenen Scheidungskindern in der beruflichen Praxis.
Zum anderen gab die Tatsache, dass in Deutschland trotz steigender Scheidungszahlen Längsschnittstudien fehlen, die altershomogene Gruppen jüngerer Kinder über einen längeren Zeitraum nach der Trennung und Scheidung untersuchen, Anlass, die vorliegende Studie anzustreben. Die Altersgruppe der Fünf- bis Neunjährigen steht im Mittelpunkt der Arbeit, da es sich bei diesen Probanden um eine Gruppe handelt, zu der wenig detaillierte und konkrete Untersuchungen vorliegen.
Assessment of bat activity in agricultural environments and the evaluation of the risk of pesticides
(2012)
Although agriculture dominates with around 50% area much of Europe- landscape, there is virtually no information on how bats use this farmed environment for foraging. Consequently, little is known about effective conservation measures to compensate potential negative effects of agrarian management practice on the food availability for bats in this habitat. Moreover, there are currently no specific regulatory requirements to include bats in European Union risk assessments for the registration of pesticides since no information about pesticide exposure on this mammal group is available. To evaluate the potential pesticide exposure of bats via ingestion of contaminated insects, information about bat presence and activity in agricultural habitats is required. In order to examine bat activity on a landscape scale it was necessary to establish a suitable survey method. Contrary to capture methods, telemetry, and direct observations, acoustic surveys of bat activity are a logistically feasible and cost-effective way of obtaining bat activity data. However, concerns regarding the methodological designs of many acoustic surveys are expressed in the scientific literature. The reasons are the failing of addressing temporal and spatial variation in bat activity patterns and the limitations of the suitability of the used acoustic detector systems. By comparing different methods and detector systems it was found that the set up of several stationary calibrated detector systems which automatically trigger the ultrasonic recording has the highest potential to produce reliable, unbiased and comparable data sets on the relative activity of bats.
By using the proposed survey method, bat diversity and activity was recorded in different crops and semi-natural habitats in southern Rhineland-Palatinate. Simultaneously, the availability of aerial prey insects was studied by using light and sticky traps. In more than 500 sampling nights about 110,000 call sequences were acoustically recorded and almost 120,000 nocturnal insects were sampled. A total of 14 bat species were recorded, among them the locally rare and critically endangered northern bat (Eptesicus nilssonii) and the barbastelle (Barbastella barbastellum), all of them also occurring over agricultural fields. The agricultural landscape of southern Palatinate is dominated by vineyards, a habitat that was shown to be of low quality for most bat species because of the demonstrated low availability of small aerial insects. By surveying bat activity and food availably in a pair-wise design on several rain water retention ponds and neighbouring vineyards it was demonstrated that aquatic insect emergence in artificial wetlands can provide an important resource subsidy for bats. The creation of artificial wetlands would be a possibility to create important foraging habitats for bats and mitigate negative effects of management practice in the agricultural landscape.
In several other agricultural crops, however, high abundances of suitable prey insects and high bat activity levels, comparable or even higher than in the nearby forests and meadows known to be used as foraging habitats were demonstrated. Especially high bat activity levels were recorded over several fruit orchards and vegetable fields where insects were also present. Both crops are known for high pesticide inputs, and, therefore, a pesticide exposure through ingestion of contaminated insects can not be excluded. To follow the current risk assessment approach for birds and mammals pesticide residues were measured on bat-specific food items in an apple orchard following insecticide applications and bat activity was recorded in parallel. The highest residue values were measured on foliage-dwelling arthropods which may results in a reproductive risk for all bat species that, even to a small extent, include this prey group in their diet. The presence of bats in agricultural landscapes that form a majority of the land area in Europe but also on a global scale leads to exposure of bats by contaminated food and depletion of their food resources by pesticide use. So far conservation efforts for bats focussed on securing hibernation sites and the creation of artificial roost sites since especially the latter were thought to be limiting population growth. However the potential pesticide effects might be also crucial for the population persistence in agricultural landscapes of bats and need to be addressed adequately, especially in risk assessment procedures for the regulation of pesticides.
Veränderungen in dem komplexen Wirkungsgefüge eines Agrarökosystems können erhebliche Auswirkungen auf die lokale Biozönose zur Folge haben. Die Überdachung von Obstkulturen mit Netzen oder Folien zum Schutz vor Hagel und Regen stellt eine solche Veränderung dar. Im Rahmen dieser Dissertation wurde anhand einer biozönotischen Risikoanalyse der Einfluss intensiver Landnutzung in Obstkulturen sowie der Einfluss von Kulturschutzeinrichtungen auf die drei Gilden tagaktive Greifvögel, insektivore Vögel und Arthropoden untersucht. Greifvögel, insektivore Vögel und räuberische Arthropoden üben als Prädatoren wichtige Regulationsfunktionen im Nahrungsnetz eines Ökosystems aus. Arthropoden stellen zudem eine wichtige Nahrungsressource dar. Arten aller drei Gilden gelten als Bioindikatoren für Veränderungen im Ökosystem. Phytophage Arthropoden können landwirtschaftlich genutzte Monokulturen erheblich schädigen, weshalb die konventionelle Landwirtschaft zur gezielten Tötung solcher Schädlinge Insektizide einsetzt. Pestizidbehandlungen haben allerdings oft auch Auswirkungen auf viele Nützlinge und andere Organismen im Agrarökosystem.
Die visuelle Erfassung beider Vogelgilden sowie das Fangen der Arthropoden mit Boden- und Flugfallen erfolgte von März bis Juli in den Jahren 2011-2013 auf fünf Untersuchungsflächen im rheinland-pfälzischen Obstanbaugebiet Mainz-Bingen. Es wurden zwei benachbarte Apfelkulturen (eine Kontrollfläche und eine Versuchsfläche mit Hagelschutznetz) und zwei benachbarte Kirschkulturen (eine Kontrollfläche und eine Versuchsfläche ab 2012 mit Folien-Netz-Überdachung) sowie eine nahegelegene Streuobstfläche im lokalen NSG Höllenberg als naturnahe Kontrollfläche untersucht. Zusätzlich wurden im ersten Untersuchungsjahr vom 15. März bis 28. Juli 2011 auf allen Flächen die Ergebnisse einer täglichen automatischen akustischen Erfassung durch ein Stereo-Aufnahmegerät („Songmeter 2“, Wildlife Acoustics) mit denen einer wöchentlichen rein visuellen Erfassung der Vögel verglichen. Es gab keine signifikanten Unterschiede in Detektionseffizienz und Arterfassung der Avifauna zwischen beiden Methoden. Die lokale α-Diversität nach Simpson unterschied sich ebenfalls nicht signifikant zwischen beiden Methoden. Das akustische Monitoring detektierte mehr seltene (=weniger als zehn Funde im Untersuchungszeitraum) Vogelarten; 29% der Arten wurden ausschließlich akustisch nachgewiesen und knapp 13% ausschließlich visuell. Sieben Vogelarten unterschieden sich signifikant in ihrer ermittelten Abundanz zwischen beiden Methoden: Bachstelze, Feldlerche, Mauersegler und die Greifvögel Mäusebussard und Turmfalke waren besser bzw. der Schwarzmilan ausschließlich mit dem visuellen Monitoring zu erfassen, während der Fasan ausschließlich durch das akustische Monitoring nachgewiesen werden konnte. Für die Abundanzschätzung von 48 Vogelarten war es unerheblich, ob sie akustisch oder visuell erfasst wurden. Da seltene Arten bei biozönotischen Untersuchungen keine wesentliche Rolle spielen und die Auswertung der Akustikaufnahmen sehr zeitaufwändig war, wurden für die Risikoanalyse nur die visuell ermittelten Daten berücksichtigt.
Für die Greifvogel-Gilde wurden sechs Arten nachgewiesen, fünf auf der Kirschkontrollfläche und jeweils vier Arten auf den anderen Flächen. Die drei häufigsten Arten waren Mäusebussard, Turmfalke und Schwarzmilan. Greifvögel wurden im Luftraum der Flächen oder auf Sitzwarten wie Zäunen, Pfählen, Bäumen und Kulturschutzeinrichtungen bei der Nahrungssuche oder beim Revierverhalten beobachtet. Es konnte kein Einfluss der Landnutzung auf Greifvögel aufgezeigt werden, Diversität und Abundanz unterschieden sich nicht zwischen den Obstkulturen und der naturnahen Streuobstfläche im NSG. Ein Einfluss von Kulturschutzeinrichtungen auf Greifvögel konnte ebenfalls nicht nachgewiesen werden, die überdachten Flächen wurden genauso oft frequentiert wie die Kontrollflächen. Greifvögel überflogen innerhalb ihrer großen Aktionsräume auch die überdachten Obstkulturen zur Nahrungssuche und wurden weiterhin bei der Ansitzjagd am Rand der Versuchsflächen gesichtet. Zudem wurde der Turmfalke beim Ansitzen unter der Folien-Netz-Überdachung der Kirschkultur sowie beim Fressen auf dieser Überdachung sitzend beobachtet. Für die Insektivoren-Gilde wurden 52 Vogelarten nachgewiesen. Die Streuobstfläche im NSG wies die höchste Artenzahl von 40 auf, gefolgt von der Apfelkontrollfläche mit 27 Arten. Die Apfelversuchsfläche wies dagegen eine geringere Artenzahl von 19 auf, während die Artenzahlen beider Kirschkulturen mit 19 und 18 annähernd gleich gewesen sind. Die zehn häufigsten Arten waren in Reihenfolge ihrer Abundanz Kohlmeise, Star, Rabenkrähe, Amsel, Mauersegler, Bachstelze, Blaumeise, Buchfink, Feldlerche und Stieglitz. Insektivore Vögel wurden überwiegend nahrungssuchend am Boden und in Bäumen der Flächen oder beim Revierverhalten wie Singen, Rufen und Vigilanz auf Sitzwarten Zäunen, Pfählen sowie Kulturschutzeinrichtungen beobachtet. Die intensive Landnutzung der Obstkulturen führte im Vergleich zur naturnahen Streuobstfläche im NSG sowohl auf der Apfel- als auch auf der Kirschkontrollfläche zu einer hochsignifikant geringeren monatlichen Vogelartenzahl. Eine signifikant niedrigere Abundanz der insektivoren Vögel wies jedoch nur die Kirschkontrollfläche auf. Es wurden negative Effekte der intensiven Landnutzung auf die monatliche Abundanz von Gartenrotschwanz, Amsel und Blaumeise nachgewiesen, welche in den Obstkulturen hochsignifikant seltener beobachtet wurden. Der Einsatz von Kulturschutzeinrichtungen führte lediglich beim Hagelschutznetz zu einer zusätzlichen signifikanten Verringerung der monatlichen Vogelartenzahl. Die Folien-Netz-Kombination zeigte keinen signifikanten Einfluss auf die Vogeldiversität. Die Gesamtabundanz der Insektivoren-Gilde blieb in beiden Obstkulturen von Kulturschutzeinrichtungen unbeeinflusst. Abundanzen einzelner Arten zeigten jedoch abweichende Ergebnisse: Die Ringeltaube wurde unter dem Hagelschutznetz der Apfelkultur im Vergleich zur Kontrollfläche gar nicht beobachtet. Die Kohlmeise kam unter der Folien-Netz-Überdachung der Kirschkultur signifikant seltener vor, während der Wiedehopf hier etwa zehnmal häufiger vorkam als auf der Kirschkontrollfläche und der Streuobstfläche im NSG Höllenberg. Entscheidender Faktor für die starke Nutzung der Kirschkulturen waren für den Wiedehopf die vorhandenen vegetationsfreien Bodenbereiche, in denen diese Art bevorzugt nach Nahrungsinsekten sucht. Störungen durch die bei Wind laut flatternde Folienüberdachung auf darunter nahrungssuchende Wiedehopfe wurden nicht beobachtet.
Für die Arthropoden-Gilde wurden 185963 Individuen aus 18 Gruppen gefangen. Der Großteil von 79% dieser Individuen ließ sich Springschwänzen, Ameisen, Zweiflüglern oder Käfern zuordnen. Weitere 20% verteilten sich auf Webspinnen, Asseln, Hautflügler, Milben, Doppelfüßer, Weberknechte, Schnabelkerfe und Ohrwürmer. Die restlichen sechs Arthropodengruppen stellten den restlichen Individuenanteil von 0,9%. Hinsichtlich der determinierten 12910 Käfer-Imagines aus 403 Arten waren Artenzahl, Diversität sowie Anzahl seltener Arten und Habitatspezialisten sandiger Lebensräume in allen drei Untersuchungsjahren auf der naturnahen Streuobstfläche im NSG Höllenberg am höchsten. Die über Bodenfallen ermittelte Arthropoden-Trockenbiomasse lag je nach Fläche bei 9 bis 26 Gramm pro Jahr und die über Flugfallen ermittelte Arthropoden-Trockenbiomasse bei 0,6 bis 4,8 Gramm pro Jahr. Obwohl im Mittel jährlich 5,8 Pestizidbehandlungen in den Kirschkulturen sowie 14,6 Behandlungen in den Apfelkulturen durchgeführt wurden und Insektizide dabei anteilig bis zu 57% ausmachten, konnte kein Einfluss der intensiven Landnutzung mit dem Einsatz von Pestiziden auf die Arthropoden-Trockenbiomasse nachgewiesen werden. Kulturschutzeinrichtungen zeigten ebenfalls keinen Einfluss auf die Arthropoden-Trockenbiomasse.
Diese biozönotische Risikoanalyse belegt, dass der Einsatz von Kulturschutzeinrichtungen zumindest bei Hagelschutznetzen langfristig nachweisbare negative Effekte auf die Diversität von insektivoren Vögeln bewirken kann, welche über die vorhandenen negativen Folgen der intensiven Landnutzung in Obstkulturen hinausgehen. Da intensiv bewirtschaftete Obstkulturen bereits ohne Kulturschutzeinrichtungen zu einer Verarmung der lokalen Biozönose führen, sollte aus ökologischer Sicht vor der Errichtung von Kulturschutzeinrichtungen verlässlich abgewogen werden, ob der zusätzliche Verlust an Biodiversität durch die Verbesserung von Flächenstrukturen der Obstkulturen kompensierbar ist.
Aquatic macrophytes can contribute to the retention of organic contaminants in streams, whereas knowledge on the dynamics and the interaction of the determining processes is very limited. The objective of the present study was thus to assess how aquatic macrophytes influence the distribution and the fate of organic contaminants in small vegetated streams. In a first study that was performed in vegetated stream mesocosms, the peak reductions of five compounds were significantly higher in four vegetated stream mesocosms compared to a stream mesocosm without vegetation. Compound specific sorption to macrophytes was determined, the mass retention in the vegetated streams, however, did not explain the relationship between the mitigation of contaminant peaks and macrophyte coverage. A subsequent mesocosm study revealed that the mitigation of peak concentrations in the stream mesocosms was governed by two fundamentally different processes: dispersion and sorption. Again, the reductions of the peak concentrations of three different compounds were in the same order of magnitude in a sparsely and a densely vegetated stream mesocosm, respectively, but higher compared to an unvegetated stream mesocosm. The mitigation of the peak reduction in the sparsely vegetated stream mesocosm was found to be fostered by longitudinal dispersion as a result of the spatial distribution of the macrophytes in the aqueous phase. The peak reduction attributable to longitudinal dispersion was, however, reduced in the densely vegetated stream mesocosm, which was compensated by compound-specific but time-limited and reversible sorption to macrophytes. The observations on the reversibility of sorption processes were subsequently confirmed by laboratory experiments. The experiments revealed that sorption to macrophytes lead to compound specific elimination from the aqueous phase during the presence of transient contaminant peaks in streams. After all, these sorption processes were found to be fully reversible, which results in the release of the primarily adsorbed compounds, once the concentrations in the aqueous phase starts to decrease. Nevertheless, the results of the present thesis demonstrate that the processes governing the mitigation of contaminant loads in streams are fundamentally different to those already described for non-flowing systems. In addition, the present thesis provides knowledge on how the interaction of macrophyte-induced processes in streams contributes to mitigate loads of organic contaminants and the related risk for aquatic environments.
Global crop production increased substantially in recent decades due to agricultural intensification and expansion and today agricultural areas occupy about 38% of Earth’s terrestrial surface - the largest use of land on the planet. However, current high-intensity agricultural practices fostered in the context of the Green Revolution led to serious consequences for the global environment. Pesticides, in particular, are highly biologically active substances that can threaten the ecological integrity of aquatic and terrestrial ecosystems. Although the global pesticide use increases steadily, our field-data based knowledge regarding exposure of non-target ecosystems such as surface waters is very restricted. Available studies have by now been limited to spatially restricted geographical areas or had rather specific objectives rendering the extrapolation to larger spatial scales questionable.
Consequently, this thesis evaluated based on four scientific publications the exposure, effects, and regulatory implications of particularly toxic insecticides` concentrations detected in global agricultural surface waters. FOCUS exposure modelling was used to characterise the highly specific insecticide exposure patterns and to analyse the resulting implications for both monitoring and risk assessment (publication I). Based on more than 200,000 scientific database entries, 838 peer-reviewed studies finally included, and more than 2,500 sites in 73 countries, the risks of agricultural insecticides to global surface waters were analysed by means of a comprehensive meta-analysis (publication II). This meta-analysis evaluated whether insecticide field concentrations exceed legally accepted regulatory threshold levels (RTLs) derived from official EU and US pesticide registration documents and, amongst others, how risks depend on insecticide development over time and stringency of environmental regulation. In addition, an in-depth analysis of the current EU pesticide regulations provided insights into the level of protection and field relevance of highly elaborated environmental regulatory risk assessment schemes (publications III and IV).
The results of this thesis show that insecticide surface water exposure is characterized by infrequent and highly transient concentration peaks of high ecotoxicological relevance. We thus argue in publication I that sampling based on regular intervals is inadequate for the detection of insecticide surface water concentrations and that traditional risk assessment concepts based on all insecticide concentrations including non-detects lead to severely biased results and critical underestimations of risks. Based on these considerations, publication II demonstrates that out of 11,300 measured insecticide concentrations (MICs; i.e., those actually detected and quantified), 52.4% (5,915 cases; 68.5%) exceeded the RTL for either water (RTLSW) or sediments. This indicates a substantial risk for the biological integrity of global water resources as additional analyses on pesticide effects in the field clearly evidence that the regional aquatic biodiversity is reduced by approximately 30% at pesticide concentrations equalling the RTLs. In addition, publication II shows that there is a complete lack of scientific monitoring data for ~90% of global cropland and that both the actual insecticide contamination of surface waters and the resulting ecological risks are most likely even greater due to, for example, inadequate sampling methods employed in the studies and the common occurrence of pesticide mixtures. A linear model analysis identified that RTLSW exceedances depend on the catchment size, sampling regime, sampling date, insecticide substance class, and stringency of countries` environmental regulations, as well as on the interactions of these factors. Importantly, the risks are significantly higher for newer-generation insecticides (i.e., pyrethroids) and are high even in countries with stringent environmental regulations. Regarding the latter, an analysis of the EU pesticide regulations revealed critical deficiencies and the lack of protectiveness and field-relevance for current presumed highly elaborated FOCUS exposure assessment (publication IV) and overall risk assessment schemes (publication III). Based on these findings, essential risk assessment amendments are proposed.
In essence, this thesis analyses the agriculture–environment linkages for pesticides at the global scale and it thereby contributes to a new research frontier in global ecotoxicology. The overall findings substantiate that agricultural insecticides are potential key drivers for the global freshwater biodiversity crisis and that the current regulatory risk assessment approaches for highly toxic anthropogenic chemicals fail to protect the global environment. This thesis provides an integrated view on the environmental side effects of global high-intensity agriculture and alerts that beside worldwide improvements to current pesticide regulations and agricultural pesticide application practices, the fundamental reformation of conventional agricultural systems is urgently needed to meet the twin challenges of providing sufficient food for a growing human population without destroying the ecological integrity of global ecosystems essential to human existence.
Bauxite is, among other raw materials, an important material for the production of refractories. However, the availability of refractory raw material grades is limited worldwide. As high iron contents have a negative influence on the temperature resistance of the refractory material produced, a maximum iron oxide content of 2 wt.-% in the bauxite is acceptable. This means that only native raw materials from a few deposits can be used. In order to counteract the problem of too high iron oxide contents in natural bauxites, the possibility of processing bauxite for the refractory industry by using an acid leaching process was to be investigated within the scope of this work. In previous studies on this topic, some investigations on iron leaching have already been carried out on individual bauxites. However, the resulting bauxite composition was mostly neglected in its entirety and only the influences of individual leaching parameters on the leaching result were investigated independently. Moreover, the results and procedures generated are not generally valid and cannot be transferred to bauxites of other chemical or mineralogical compositions.
In order to clarify the open questions in the processing of natural bauxites, leaching tests with hydrochloric acid were carried out on five different bauxites within this work. By using computerized statistical design of experiments, an individual model was generated for each bauxite to predict the optimal factor settings. The factors investigated were acid concentration, solid-acid ratio, leaching temperature, leaching time and grain fraction. The general planning method for bauxite processing developed in this context contains all necessary factors, useful factor settings and the effects to be considered during planning and evaluation. It could be shown that, based on this planning method, a significant, individual model can be created for each of the bauxites investigated, which predicts the optimal leaching settings for the corresponding bauxite. Furthermore, it was found that the transfer of an already created model to another bauxite of similar composition is possible. Based on the results obtained from the leaching tests and model fittings, in combination with further results on the structural analysis of the bauxites, insights into the leachability of various aluminium and iron minerals from bauxite could be gained.
To develop a sustainable acid leaching process, the possibility of regenerating the contaminated acid produced was also tested as an example. It was shown that liquid-liquid extraction can extract more than 99 % of the iron present in the solution and that the regenerated acid can then be reused for the leaching process.
The conservation of groundwater ecosystems requires an assessment and evaluation scheme that shows the state of the ecosystem. Consequently, faunal and microbial criteria are required for groundwater monitoring, in addition to physico-chemical analyses. To proof the adequacy of the application of groundwater organisms for the biological assessment of groundwater quality, an extensive sampling collection of various groundwater systems was accomplished between 2002 and 2009 in Germany. Key aspects were the examination of the indicator potential of groundwater communities towards surface-groundwater interactions and anthropogenic impacts, as well as the analysis of stygofaunal distribution patterns, as a base and reference for a faunal assessment scheme of groundwater systems. The sampling design considered local, regional, and biogeographic conditions. To test the indicator potential of groundwater organisms on a local and regional scale, groundwater systems in Nordrhein-Westfalen (NRW) and Baden-Württemberg (BW) were examined. The faunal and microbial data from unconsolidated aquifers (Erftgebiet, NRW) show the sensitivity of groundwater organisms against land use effects, e.g. extensive agriculture. Data analyses revealed positive correlations of organic material (estimated amount of detritus, TOC) and nitrate with faunal abundance, species richness, diversity and the proportions of stygoxene species. Moreover, the bacterial abundance and diversity in the groundwater of the Erftgebiet was high compared to oligotrophic groundwater systems, indicating an effect of surface influence due to agricultural land use. The groundwater colonization in the Alb-Donau-Kreis (BW) was analyzed for regional effects (landscape, type of aquifer, hydrogeology) and local effects (comparing single wells). The results show that the fauna reflects the strength of the hydrological exchange on different spatial scales. Furthermore, the fauna reflects the interaction of regional and local conditions. Accordingly, the diversity and abundance of groundwater organisms was influenced by the high connectivity of the karst and unconsolidated alluvial aquifers, the type of land use, covering layers of soil, the age of groundwater, and the sampling depths. In general, faunal and microbial data of the Alb-Donau-Kreis are characteristic for oligotrophic, oligoalimonic groundwaters. The large scale analyses of stygofaunal distribution patterns revealed significant biogeographical differences of the communities. These community patterns of the groundwater fauna do not coincide with existing classification schemes defined for surface landscapes or freshwater systems. The largest differences between faunal surface and subsurface distribution patterns were found between the groundwater of northern and southern Germany and the foothills of the central mountain ranges - all of them regions shaped by the last ice ages.
In accordance with the faunal data assessed in groundwater, four different stygoregions were defined that are populated by distinct faunal assemblages. These are 1) the "Northern lowlands", 2) the "Central mountain ranges", 3) the "South-western mountain ranges", and 4) the "Southern mountain ranges and northern alps". The study corroborates that stygofaunal and microbial communities are an adequate tool for the qualitative assessment and monitoring of groundwater ecosystems. The best indicators to detect anthropogenic impacts on groundwater ecosystems are the faunal diversity, abundance, the proportions of stygobitic (obligate groundwater species) and stygoxene species (species not obligate for groundwater), and the bacterial abundance. The development of an ecologically based groundwater assessment and management, is crucial for the conservation of our groundwater ecosystems and thus, healthy drinking water. The defintion of "stygoregions" is an important base for the development of an assessment and reference scheme for groundwater ecosystems. The assessment of the ecological state of groundwater systems must be conducted on local scale, because the strength of the local hydrological influence determines the amount of food and oxygen as well as stygoxene animals within the aquifer, and thus shapes the local groundwater communities. Nevertheless, information of the biogeographic and regional conditions is needed as a reference for the type of species and abundances that potentially can occur in certain groundwater systems.
In recent decades, there has been a growing awareness in our society of the impor-
tance of medicines that are personalized to the needs of patients. This dissertation
contributes to the research on personalized dosage forms with controlled drug release.
The basis of our investigations is the simulation of the expected diffusion properties
of these personalized dosage forms using computer-aided statistical methods and the
subsequent adaptation of suitable models to experimentally obtained data. This
novel approach makes it possible to verify the parameters determined from exper-
imental data, such as the diffusion coefficient. A key finding is that, for instance,
the homogeneity of the sample, the precision of the measurement data collection
and the consideration of the measurement environment have a greater influence on
the validity of the diffusion coefficient than the choice of the diffusion model. The
experimental part of this thesis comprises the development and characterization of
drug-loaded polymer resins, the implant fabrication, and the pharmaceutical and
physical investigation of the polymer-drug implants. The formulation of polymer
resins and their suitability for 3D printing (3DP), as well as their use in pharmaceu-
tical applications, are extensively addressed. The release properties and, in partic-
ular, the polymer network’s mesh size influence on the active ingredient’s diffusion
rate in aqueous solution are studied. In addition, the production of polymer sam-
ples by means of UV photopolymerization in a molding process developed for this
purpose, as well as by using stereolithographic 3DP, are examined comparatively.
The polymerization process and the polymer properties resulting from the different
production methods are presented. The major findings from these studies include
the successful development of a polymer resin formulation whose release and swelling
properties are comprehensively demonstrated using a model drug. Furthermore, the
optimization of this resin for the use of the active pharmaceutical ingredient (API)
testosterone was achieved. A comparison of the two developed resin formulations
clearly shows the limitations and the possibilities of transferability of both systems.
In addition, the results concerning the release of API from the polymer, as well as
the diffusion of the solvent into the polymer and the resulting increase in the volume,
provide insight into the changed interfacial diffusion resistance in 3D printed poly-
mers compared to molded polymers. This work thus contributes to the development
of personalized drug forms and paves the way for the production of release-controlled
polymer resin implants for future follow-up work.
Leichte Sprache (LS, easy-to-read German) is a simplified variety of German. It is used to provide barrier-free texts for a broad spectrum of people, including lowliterate individuals with learning difficulties, intellectual or developmental disabilities (IDD) and/or complex communication needs (CCN). In general, LS authors are proficient in standard German and do not belong to the aforementioned group of people. Our goal is to empower the latter to participate in written discourse themselves. This requires a special writing system whose linguistic support and ergonomic software design meet the target group’s specific needs. We present EasyTalk a system profoundly based on natural language processing (NLP) for assistive writing in an extended variant of LS (ELS). EasyTalk provides users with a personal vocabulary underpinned with customizable communication symbols and supports in writing at their individual level of proficiency through interactive user guidance. The system minimizes the grammatical knowledge needed to produce correct and coherent complex contents by intuitively formulating linguistic decisions. It provides easy dialogs for selecting options from a natural-language paraphrase generator, which provides context-sensitive suggestions for sentence components and correctly inflected word forms. In addition, EasyTalk reminds users to add text elements that enhance text comprehensibility in terms of audience design (e.g., time and place of an event) and improve text coherence (e.g., explicit connectors to express discourse-relations). To tailor the system to the needs of the target group, the development of EasyTalk followed the principles of human-centered design (HCD). Accordingly, we matured the system in iterative development cycles, combined with purposeful evaluations of specific aspects conducted with expert groups from the fields of CCN, LS, and IT, as well as L2 learners of the German language. In a final case study, members of the target audience tested the system in free writing sessions. The study confirmed that adults with IDD and/or CCN who have low reading, writing, and computer skills can write their own personal texts in ELS using EasyTalk. The positive feedback from all tests inspires future long-term studies with EasyTalk and further development of this prototypical system, such as the implementation of a so-called Schreibwerkstatt (writing workshop)
The use of agricultural plastic covers has become common practice for its agronomic benefits such as improving yields and crop quality, managing harvest times better, and increasing pesticide and water use efficiency. However, plastic covers are suspected of partially breaking down into smaller debris and thereby contributing to soil pollution with microplastics. A better understanding of the sources and fate of plastic debris in terrestrial systems has so far been hindered by the lack of adequate analytical techniques for the mass-based and polymer-selective quantification of plastic debris in soil. The aim of this dissertation was thus to assess, develop, and validate thermoanalytical methods for the mass-based quantification of relevant polymers in and around agricultural fields previously covered with fleeces, perforated foils, and plastic mulches. Thermogravimetry/mass spectrometry (TGA/MS) enabled direct plastic analyses of 50 mg of soil without any sample preparation. With polyethylene terephthalate (PET) as a preliminary model, the method limit of detection (LOD) was 0.7 g kg−1. But the missing chromatographic separation complicated the quantification of polymer mixtures. Therefore, a pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) method was developed that additionally exploited the selective solubility of polymers in specific solvents prior to analysis. By dissolving polyethylene (PE), polypropylene (PP), and polystyrene (PS) in a mixture of 1,2,4-trichlorobenzene and p-xylene after density separation, up to 50 g soil became amenable to routine plastic analysis. Method LODs were 0.7–3.3 mg kg−1, and the recovery of 20 mg kg−1 PE, PP, and PS from a reference loamy sand was 86–105%. In the reference silty clay, however, poor PS recoveries, potentially induced by the additional separation step, suggested a qualitative evaluation of PS. Yet, the new solvent-based Py-GC/MS method enabled a first exploratory screening of plastic-covered soil. It revealed PE, PP, and PS contents above LOD in six of eight fields (6% of all samples). In three fields, PE levels of 3–35 mg kg−1 were associated with the use of 40 μm thin perforated foils. By contrast, 50 μm PE films were not shown to induce plastic levels above LOD. PP and PS contents of 5–19 mg kg−1 were restricted to single observations in four fields and potentially originated from littering. The results suggest that the short-term use of thicker and more durable plastic covers should be preferred to limit plastic emissions and accumulation in soil. By providing mass-based information on the distribution of the three most common plastics in agricultural soil, this work may facilitate comparisons with modeling and effect data and thus contribute to a better risk assessment and regulation of plastics. However, the fate of plastic debris in the terrestrial environment remains incompletely understood and needs to be scrutinized in future, more systematic research. This should include the study of aging processes, the interaction of plastics with other organic and inorganic compounds, and the environmental impact of biodegradable plastics and nanoplastics.
Diese Studie leistet einen Beitrag zur Weiterentwicklung der Nachrichtenwerttheorie. Hierzu wird das Konzept der Fotonachrichtenfaktoren zunächst theoretisch aufgearbeitet und seine Plausibilität anhand verschiedener Teilbereiche der Journalismusforschung dargelegt. Darauf aufbauend wird es im Rahmen einer Inhaltsanalyse eingesetzt, die die Prüfung des erweiterten Modells der Nachrichtenwerttheorie ermöglicht. Dieses Modell geht von einem gemeinsamen Einfluss der textbasierten Nachrichtenfaktoren und der Fotonachrichtenfaktoren auf den Nachrichtenwert bzw. die journalistische Beachtung eines Beitrags aus. Ergänzend werden die Fotonachrichtenfaktoren zur Bildung von Fototypen herangezogen. Die Analysen werden am Beispiel der Kriegs- und Krisenberichterstattung deutscher Tageszeitungen durchgeführt. Dieser Themenbereich des Journalismus genießt viel Aufmerksamkeit sowohl bei Medienrezipienten als auch bei Kommunikationswissenschaftlern. Die Ergebnisse der Studie unterstützen die Grundidee der Fotonachrichtenfaktoren: Sie können, ähnlich wie die textbasierten Nachrichtenfaktoren, zu übergeordneten Bündeln zusammengefasst werden. Diese Bündel zeigen Einflüsse auf die formale Gestaltung der Fotos und können gemeinsam mit den Textnachrichtenfaktoren teilweise die journalistische Beachtung des Artikels erklären. Darüber hinaus ist die gewählte Operationalisierung der Fotonachrichtenfaktoren geeignet, Fototypen bzw. zentrale Motive der visuellen Kriegsberichterstattung deutscher Tageszeitungen zu identifizieren. Die Ergebnisse dieser Studie liefern Ausgangspunkte für weitere Fragestellungen zum Zusammenwirken der Text- und Fotonachrichtenfaktoren, der Anwendung der Zwei-Komponenten-Theorie und der Wirkung von typischen Bildmotiven.
In der Dissertation Freiheit und Werte bei Jean-Paul Sartre wird das Verhältnis zwischen
Freiheit und Werten in der Philosophie von Jean-Paul Sartre analysiert. Es wird untersucht, auf
welche Weise die existenzielle Freiheit des Menschen mit seinen moralischen und
außermoralischen Werten nach Sartre zusammenhängt. Ziel der Untersuchung ist es, einen
Beitrag zum Verständnis von Sartres Wertlehre sowie seiner Ethik der Authentizität zu leisten.
Grundlage für die Untersuchung bilden neben Sartres philosophischen Werken, seine
literaturtheoretischen sowie politisch-gesellschaftlichen Schriften. Ausgehend von einer
Analyse der existenziellen Freiheit bei Sartre wird der vielschichtige Zusammenhang zwischen
Freiheit und Werten bei Sartre analysiert und in den Gesamtkontext seiner Philosophie gestellt.
Die Dissertation zeigt, dass sich in Sartres Werk sowohl eine subjektivistische als auch eine
objektivistische Wertlehre ausmachen lässt. Während Sartre in vielen Passagen seines Werkes
die subjektivistische Position vertritt, dass alle moralischen und außermoralischen Werte auf
das bewertende Subjekt zurückgehen, präsentiert er an anderen Stellen seines Werkes den
moralischen Wert der Freiheit sowie den außermoralischen Wert des An-sich-für-sich.
Abgesehen von jenem Spannungsverhältnis macht die Untersuchung deutlich, dass der
moralische Wert der Freiheit für Sartre innerhalb seiner gesamten Philosophie von großer
Bedeutung ist. Eine Verwirklichung jenes Wertes ist nach Sartre nicht nur zentraler Bestandteil
einer engagierten Literatur, sondern auch für eine gerechte Gesellschaft wesentlich.
Analyse und Bewertung der Resilienz von Unternehmen und Geschäftsprozessen aus Ressourcensicht
(2025)
Companies can be affected by events that adversely impact their business operations. These events can originate from corporate environments or within companies themselves. The effects of these events may be quite diverse and can threaten the survival of companies in the worst case. To deal with events that can adversely impact business operations of companies, the concept of resilience can be used. The concept of resilience relates to the ability of companies to handle adverse circumstances. It encompasses different aspects from measuring to restoring and strengthening the resilience of companies. This dissertation deals with the concept of resilience within the corporate context. It considers the concept of resilience from a company and business process perspective and provides different research contributions for this contexts. From a company perspective, a concept and a model are presented that serve as the basis to analyse the resilience of companies. The concept shows essential elements that are important for considering the resilience of companies. The model outlines the range that can be used to analyse the resilience of companies. Furthermore, a corporate maturity model is introduced to assess the resilience of companies. It encompasses different attributes and resilience levels to determine and improve the resilience of compannies. From a business process perspective, a lifecycle and metrics for business process resilience are presented. The lifecycle shows different phases relating to resilience considerations of business processes. The metrics are used to measure the resilience of business processes.
Perfluorocarboxylic acids (PFCA) are substances of anthropogenic origin and have been used for several decades. These compounds are a new class of environmental pollutants. Their high surface activity, thermal stability, amphipathicity and weak intermolecular interactions lead to persistence and bioaccumulation. Therefore, there is a great need for reliable analytical methods for detecting the presence and determination of concentration in both environmental samples and everyday products. GC-MS is a cost-effective alternative and supplement to established LC-MS/MS methods. The greatest challenge in the method development is the derivatization reaction. Many of the previously published derivatization reactions for PFCA are time consuming and require high reaction temperatures or toxic reagents.
In the present dissertation, two new derivatization reactions for PFCA have been developed and optimized. The first part of the thesis shows the development and optimization of the reaction with triethylsilanol in water. In addition to optimizing the reaction, classical solid-phase extraction was modified to simplify the sample preparation.
In the second part of the work, the reaction products of perfluorooctanoic acid (PFOA) with N,N-dimethylformamide dimethyl acetal (DMF-DMA) and -diethyl acetal (DMF-DEA) were identified. From these measurements, it follows that both DMF-DMA and DMF-DEA in the presence of PFOA form an iminium cation, which leads to salt formation. This PFOA salt react further in the GC injector and a corresponding amine is produced.
In the last part of the thesis, an analytical method based on the DMF-DMA reaction was developed. The matrix effects have been described in detail. The method has been successfully applied for three different types of samples: dental floss, textiles and sewage sludge. The results were verified by LC-MS/MS analysis in an external laboratory. The differences between the PFCA values for a spiked sample measured by GC-MS and LC-MS/MS were less than 10%.
The belief in a just world in face of injustice: victim, observer, and perpetrator perspectives
(2021)
Injustice happens every day either to us, to our neighbors, or people across the world. Yet, believing that the world is a fair place helps us to cope with this injustice and motivates us to behave fairly. Scholars have found that these functions that the belief in a just world (BJW) serves are crucial for maintaining mental health. However, the conditions under which BJW is functional and when people give up this belief are not well studied. The current dissertation aims to examine: when the BJW can be shattered, the role of the external world and other internal resources in face of injustice, and the role of BJW in predicting corrupt behavior. Three studies were conducted corresponding to each party of injustice: a victim, an observer, and a perpetrator.
Study 1 examined the effects of criminal victimization on BJW and buffering role of perceptions of justice in the criminal justice process. A cross-sectional study showed that victims of very severe crimes such as domestic violence and human trafficking had lower personal BJW than non-victims and victims of less severe crimes, and higher informational justice perceptions reduced the effect of victimization on the personal BJW. Study 2 aimed to test the changes in BJW after observing severe injustice. A longitudinal study showed that after observing school rampage attacks that happened at other schools, BJW of adolescent participants increased. Moreover, life satisfaction and perceived social support moderated the change of BJW. Study 3 examined relationships between BJW and corrupt behavior. A cross-sectional study showed that personal BJW can predict bribery behavior.
The findings of three studies provided evidence that BJW does not function in isolation. An external world and internal resources can reduce the threat of injustice on BJW. BJW plays an important role in predicting unfair behavior therefore authorities should aim to maintain the BJW of their citizens.
Statistical eco(-toxico)logy
(2017)
Freshwaters are of immense importance for human well-being.
Nevertheless, they are currently facing unprecedented levels of threat from habitat loss and degradation, overexploitation, invasive species and
pollution.
To prevent risks to aquatic ecosystems, chemical substances, like agricultural pesticides, have to pass environmental risk assessment (ERA) before entering the market.
Concurrently, large-scale environmental monitoring is used for surveillance of biological and chemical conditions in freshwaters.
This thesis examines statistical methods currently used in ERA.
Moreover, it presents a national-scale compilation of chemical monitoring data, an analysis of drivers and dynamics of chemical pollution in streams and, provides a large-scale risk assessment by combination with results from ERA.
Additionally, software tools have been developed to integrate different datasets used in ERA.
The thesis starts with a brief introduction to ERA and environmental monitoring and gives an overview of the objectives of the thesis.
Chapter 2 addresses experimental setups and their statistical analyses using simulations.
The results show that current designs exhibit unacceptably low statistical power, that statistical methods chosen to fit the type of data provide higher power and that statistical practices in ERA need to be revised.
In chapter 3 we compiled all available pesticide monitoring data from Germany.
Hereby, we focused on small streams, similar to those considered in ERA and used threshold concentrations derived during ERA for a large-scale assessment of threats to freshwaters from pesticides.
This compilation resulted in the most comprehensive dataset on pesticide exposure currently available for Germany.
Using state-of-the-art statistical techniques, that explicitly take the limits of quantification into account, we demonstrate that 25% of small streams are at threat from pesticides.
In particular neonicotinoid pesticides are responsible for these threats.
These are associated with agricultural intensity and can be detected even at low levels of agricultural use.
Moreover, our results indicated that current monitoring underestimates pesticide risks, because of a sampling decoupled from precipitation events.
Additionally, we provide a first large-scale study of annual pesticide exposure dynamics.
Chapters 4 and 5 describe software solutions to simplify and accelerate the integration of data from ERA, environmental monitoring and ecotoxicology that is indispensable for the development of landscape-level risk assessment.
Overall, this thesis contributes to the emerging discipline of statistical ecotoxicology and shows that pesticides pose a large-scale threat to small streams.
Environmental monitoring can provide a post-authorisation feedback to ERA.
However, to protect freshwater ecosystems ERA and environmental monitoring need to be further refined and we provide software solutions to utilise existing data for this purpose.
The global problematic issue of the olive oil industry is in its generation of large amounts of olive mill wastewater (OMW). The direct discharge of OMW to the soil is very common which presents environmental problems for olive oil producing countries. Both, positive as well as negative effects on soil have been found in earlier studies. Therefore, the current study hypothesized that whether beneficial effects or negative effects dominate depends on the prevailing conditions before and after OMW discharge to soil. As such, a better understanding of the OMW-soil interaction mechanisms becomes essential for sustainable safe disposal of OMW on soil and sustainable soil quality.
A field experiment was carried out in an olive orchard in Palestine, over a period of 24 months, in which the OMW was applied to the soil as a single application of 14 L m-2 under four different environmental conditions: in winter (WI), spring (SP), and summer with and without irrigation (SUmoist and SUdry). The current study investigated the effects of seasonal conditions on the olive mill wastewater (OMW) soil interaction in the short-term and the long-term. The degree and persistence of soil salinization, acidification, accumulation of phenolic compounds and soil water repellency were investigated as a function of soil depth and time elapsed after the OMW application. Moreover, the OMW impacts on soil organic matter SOM quality and quantity, total organic carbon (SOC), water-extractable soil organic carbon (DOC), as well as specific ultraviolet absorbance analysis (SUVA254) were also investigated for each seasonal application in order to assess the degree of OMW-OM decomposition or accumulation in soil, and therefore, the persisting effects of OMW disposal to soil.
The results of the current study demonstrate that the degree and persistence of relevant effects due to OMW application on soil varied significantly between the different seasonal OMW applications both in the short-term and the long-term. The negative effects of the potentially hazardous OMW residuals in the soil were highly dependent on the dominant transport mechanisms and transformation mechanisms, triggered by the ambient soil moisture and temperature which either intensified or diminished negative effects of OMW in the soil during and after the application season. The negative effects of OMW disposal to the soil decreased by increasing the retention time of OMW in soil under conditions favoring biological activity. The moderate conditions of soil moisture and temperature allowed for a considerable amount of applied OMW to be biologically degraded, while the prolonged application time under dry conditions and high temperature resulted in a less degradable organic fraction of the OMW, causing the OMW constituents to accumulate and polymerize without being degraded. Further, the rainfall during winter season diminished negative effects of OMW in the soil; therefore, the risk of groundwater contamination by non-degraded constituents of OMW can be highly probable during the winter season.