@article{Schaaf, author = {Schaaf, Wolfgang}, title = {Chemismus hochkonzentrierter Bodenl{\"o}sungen aus kohle- und pyrithaltigen Kippenb{\"o}den und Wechselwirkungen mit Festphase}, language = {de} } @article{Puhlmann, author = {Puhlmann, M.}, title = {Stoffkonzentrations{\"a}nderungen in der Bodenl{\"o}sung dreier unterschiedlich vorbelasteter Kiefern{\"o}kosysteme im nordostdeutschen Tiefland}, language = {de} } @article{HangenGerkeSchaafetal., author = {Hangen, Edzard and Gerke, Horst H. and Schaaf, Wolfgang and H{\"u}ttl, Reinhard F.}, title = {Hydrophobie und pr{\"a}ferentieller Fluß in einem aufgeforsteten Kippenboden}, language = {de} } @article{Wilden, author = {Wilden, R.}, title = {Kiefern-Aufforstung auf Kippen - Applikation von Minerald{\"u}nger, Kl{\"a}rschlamm und Kompost}, language = {de} } @article{Schaaf, author = {Schaaf, Wolfgang}, title = {Wasser- und Stoffhaushalt von Kiefern{\"o}kosystemen auf Kippe}, language = {de} } @incollection{FischerBergmannHuettl, author = {Fischer, Thomas and Bergmann, Charlotte and H{\"u}ttl, Reinhard F.}, title = {Auswirkungen sich zeitlich {\"a}ndernder Schadstoffdepositionen auf Prozesse des Kohlenstoff- und Stickstoffumsatzes im Boden}, series = {Atmosph{\"a}rensanierung und Wald{\"o}kosysteme}, booktitle = {Atmosph{\"a}rensanierung und Wald{\"o}kosysteme}, editor = {H{\"u}ttl, Reinhard F. and Bellmann, Klaus and Seiler, Wolfgang}, publisher = {Eberhard-Blottner-Verlag}, address = {Taunusstein}, isbn = {3-89367-053-X}, pages = {144 -- 160}, language = {de} } @misc{SchaafZech, author = {Schaaf, Wolfgang and Zech, Wolfgang}, title = {D{\"u}ngung mit gebranntem Magnesit und Magnesiumhydroxid zur Standortmelioration in einem stark gesch{\"a}digten Fichten{\"o}kosystem}, language = {de} } @incollection{Weisdorfer, author = {Weisdorfer, M.}, title = {Auswirkungen sich zeitlich {\"a}ndernder Schadstoffdepositionen auf Stofftransport und -umsetzung im Boden}, language = {de} } @misc{Huettl, author = {H{\"u}ttl, Reinhard F.}, title = {{\"O}kologisches Entwicklungspotential der Bergbaufolgelandschaften im Lausitzer Braunkohlerevier - ein interdisziplin{\"a}rer Forschungsschwerpunkt an der Brandenburgischen Technischen Universit{\"a}t Cottbus}, language = {de} } @article{SchaafWeisdorferHuettl, author = {Schaaf, Wolfgang and Weisdorfer, M. and H{\"u}ttl, Reinhard F.}, title = {SANA E: {\"O}kosystemare Untersuchungen in drei Kiefernbest{\"a}nden unterschiedlicher atmosph{\"a}rischer Belastung im Nordostdeutschen Tiefland}, language = {de} } @article{SchaafWeisdorferHuettl, author = {Schaaf, Wolfgang and Weisdorfer, M. and H{\"u}ttl, Reinhard F.}, title = {Soil solution chemistry and element budgets of three Scots pine ecosystems along a deposition gradient in north-eastern Germany}, language = {en} } @misc{SchaafZech, author = {Schaaf, Wolfgang and Zech, Wolfgang}, title = {Element turnover in a heavily damaged Norway spruce ecosystem influenced by N deposition}, pages = {277 -- 285}, language = {en} } @article{Schaaf, author = {Schaaf, Wolfgang}, title = {Sickerwasserchemie dreier Kiefern{\"o}kosysteme entlang eines Depositionsgradienten im Nordostdeutschen Tiefland}, language = {de} } @article{Huettl, author = {H{\"u}ttl, Reinhard F.}, title = {Nutrient supply of forest soils in relation to management and site history}, language = {en} } @misc{FischerVesteEiseleetal., author = {Fischer, Thomas and Veste, Maik and Eisele, Andreas and Bens, Oliver and Spyra, Wolfgang and H{\"u}ttl, Reinhard F.}, title = {Small Scale Spatial Heterogeneity of Normalized Difference Vegetation Indices (NDVI) and Hot Spots of Photosynthesis in Biological Soil Crusts}, series = {Flora}, volume = {207}, journal = {Flora}, number = {3}, doi = {10.1016/j.flora.2012.01.001}, pages = {159 -- 167}, abstract = {Normalized Difference Vegetation Indices (NDVIs) are typically determined using satellite or airborne remote sensing, or field portable spectrometers, which give an averaged signal on centimetre to metre scale plots. Biological soil crust (BSC) patches may have smaller sizes, and ecophysiological, hydrological as well as pedological processes may be heterogeneously distributed within this level of resolution. A ground-based NDVI imaging procedure using low-cost equipment (Olympus Camedia 5000z digital camera equipped with a Hoya R72 infrared filter) was developed in this study to fill this gap at the level of field research, where carrying costly and bulky equipment to remote locations is often the limiting factor for data collection. Method principle and field data are presented, and the field experiment was deepened comparing NDVI measurements and CO2 turnover of soil crust samples in the laboratory, backing the reliability of the approach. A commercially available colour rendition chart with known red (600-700 nm) and NIR (800-900 nm) reflectances was placed into each scene and used for calibration purposes on a per-image basis. Generation of NDVI images involved (i) determination of red and NIR reflectances from the pixel values of the red and NIR channels, respectively, and (ii) calculation and imaging of the NDVI, where NDVI values of -1 to +1 were mapped to grey values of 0 to 255. The correlation between NDVI values retrieved from these images and NDVI values determined using field spectrometry was close (r2 = 0.91), the 95\% confidence interval amounted to 0.10 NDVI units. The pixel resolution was 0.8 mm in the field and 0.2 mm in the laboratory, but can still be improved significantly with closer distance to the crust or with higher camera resolution. NDVI values obtained using the new method were related to the net CO2 uptake of BSCs, where both slope and correlation coefficient of the respective regression function conformed with literature data. Geostatistical analysis revealed that both spatial variability of net CO2 uptake as well as size of individual hot spots of this parameter increased with crust development. The latter never exceeded 4 mm in the investigated crusts, which points to the necessity of high resolution imaging for linking remote sensing with ecophysiology. Perspectively, the new method could be used for field monitoring of both biological soil crusts and vascular vegetation.}, language = {en} } @misc{ZyakunNiiAnnangFrankeetal., author = {Zyakun, Anatoly and Nii-Annang, Seth and Franke, Gabriele and Fischer, Thomas and Buegger, Franz and Dilly, Oliver}, title = {Microbial Actvity and 13C/12C Ratio as Evidence of N-Hexadecane and N-Hexadecanoic Acid Biodegradation in Agricultural and Forest Soils}, series = {Geomicrobiology Journal}, volume = {28}, journal = {Geomicrobiology Journal}, number = {7}, issn = {1521-0529}, doi = {10.1080/01490451.2010.489922}, pages = {632 -- 647}, abstract = {The dynamics of microbial degradation of exogenous contaminants, n-hexadecane and its primary microbial oxidized metabolite, n-hexadecanoic (palmitic) acid, was studied for topsoils, under agricultural management and beech forest on the basis the changes in O2 uptake, CO2 evolution and its associated microbial and non-microbial carbon isotopic signature, the respiratory quotient (RQ) and the priming effect (PE) of substrates. Soil microbial communities in agricultural soil responded to the n-hexadecane addition more rapidly compared to those of forest soil, with lag-periods of about 23 ± 10 and 68 ± 13 hours, respectively. Insignificant difference in the lag-period duration was detected for agricultural (tlag = 30 ± 13 h) and forest (tlag = 30 ± 14 h) soils treated with n-hexadecanoic (palmitic) acid. These results demonstrate that the soil microbiota differed in metabolic activities for using n-hexadecane as a reductive hydrocarbon and n-hexadecanoic acid as a partly oxidized hydrocarbon. The corresponding δ13C of respired CO2 after the addition of the hydrocarbon contaminants to soils indicates a shift in microbial activity towards the consumption of exogenous substrates with a more complete degradation of n-hexadecane in the agricultural soil, for which some initial contents of hydrocarbons are inherent. It was reflected in the carbon isotope signature of microbial biomass. It is supposed that the observed deviation of RQ from theoretically calculated value under microbial substrate mineralization is determined by difference in the time (Δti) of registration of CO2 production and O2 consumption. Positive priming effect (PE) of n-hexadecane and negative PE of n-hexadecanoic (palmitic) acid were detected in agricultural and forest soils. It is suggested that positive PE of n-hexadecane is conditioned by the induction of microbial enzymes that perform hydroxylation/oxygenation of stable SOM compounds mineralized by soil microbiota to CO2. The microbial metabolism coupled with oxidative decarboxylation of n-hexadecanoic acid is considered as one of the most probable causes of the revealed negative PE value.}, language = {en} } @misc{DillyNiiAnnangFrankeetal., author = {Dilly, Oliver and Nii-Annang, Seth and Franke, Gabriele and Fischer, Thomas and Buegger, Franz and Zyakun, Anatoly}, title = {Resilience of microbial respiration, respiratory quotient and stable isotope characteristics to soil hydrocarbon addition}, series = {Soil Biology and Biochemistry}, volume = {43}, journal = {Soil Biology and Biochemistry}, number = {9}, issn = {0038-0717}, doi = {10.1016/j.soilbio.2010.09.026}, pages = {1808 -- 1811}, abstract = {On the basis of CO2 evolution rate, O2 uptake rate, and 13C isotopic signature of respired CO2, the metabolic response to the addition of 13C labelled n-hexadecane and palmitic acid each with supplementary nitrogen was studied for two topsoils, one under continuous agricultural management and the other under beech forest. The CO2 evolution rate was immediately stimulated in the agricultural soil and the respiratory quotient (RQ) decreased from 0.8 to 0.4 mol CO2 evolution rate per mol O2 uptake rate, which was below the theoretically expected value of 0.65 and 0.70 for the degradation of n-hexadecane and palmitic acid, respectively. The microbial response was delayed in the forest soil, but developed better than in the agricultural soil throughout the subsequent 2-4 weeks. Consequently, the respiration rate returned earlier to the initial level for the beech forest soil and the δ13C of respired CO2 and RQ approached values before hydrocarbon addition. Based on the link among respiration rates, RQ and 13C-CO2 value, the added oil-analogue compounds induced a more rapid response in the agricultural soil and were degraded more completely in the forest soil. We concluded that the resilience, which we defined here as the capacity of the soil microbiota to buffer perturbance and to reorganise in response to change resulting in a more desirable system, was higher in our forest soil than for the agricultural soil.}, language = {de} } @misc{MedinskiFreeseBoehmetal., author = {Medinski, Tanya V. and Freese, Dirk and B{\"o}hm, Christian and Slazak, Anna}, title = {Soil carbon fractions in short rotation poplar and black locust coppices, Germany}, series = {Agroforestry Systems}, volume = {88}, journal = {Agroforestry Systems}, number = {3}, issn = {1572-9680}, doi = {10.1007/s10457-014-9709-2}, pages = {505 -- 515}, abstract = {Short rotation coppice (SRC) is seen as a successful management system, which in addition to energy wood production may enhance soil carbon sequestration. The objective of this study was to investigate total, labile and stable soil carbon fractions at SRCs composed of poplar clones Max 1 (Populus nigra x P. maximowiczii), Muhle Larsen (Populus Trichocarpa), and black locust (Robinia pseudoacacia L.). Study was conducted at three SRC sites (Allendorf, Dornburg, and Forst) varying in age (1-4 years old), soil texture and climatic characteristics, in Germany. Composite soil samples collected at SRCs from 0 to 3; 0-10; 10-30; and 30-60 cm depth layers were compared with soils collected from adjacent crop strips. Samples were analysed for total organic carbon (TOC), hot-water extractable carbon (HWC), and organic carbon (OC) at 250-2,000; 53-250; and\53 lm soil-size aggregates. Total OC stocks in 0-60 cm soil layer were the highest at the site with the heaviest texture, Dornburg, followed by Forst and Allendorf, comprising 92-107; 59-74; and 53-64 Mg ha-1, respectively. Although no significant differences in the total OC stocks between SRCs and adjacent crops were found for the 0-60 cm layer, a significantly (p\0.05) higher TOC, HWC, OC at macroaggregates (250-2,000 lm), and the amount of macro-aggregates were found in the top 0-3 cm layer in all SRC sites (except the youngest poplar SRC in Forst) compared to adjacent crop strips. A greater macro-aggregate formation in SRCs related to the lower soil disturbance compared to the tilled crops, revealed a potential of SRC for C sequestration, as C occluded within soil aggregates has a slower decomposition rates and longer residence time.}, language = {en} } @misc{KueppersKueppersHornaetal., author = {K{\"u}ppers, Manfred and K{\"u}ppers, Barbara I. L. and Horna, Viviana and Veste, Maik and Zimmermann, Reiner and Lauerer, Marianne and Aas, Gregor}, title = {Green barks of trees from drought deciduous forests ("bosque seco") in northern Peru/southern Ecuador do not perform CAM}, series = {Basic and Applied Dryland research}, journal = {Basic and Applied Dryland research}, issn = {1864-3191}, doi = {10.1127/badr/2015/0002}, pages = {15}, abstract = {Trees from drought deciduous forests ("bosque seco") in northern Peru and southern Ecuador regularly shed their leaves at the onset of seven months-long periods without rain. This way they very effectively reduce the bulk water consumption by leaf transpiration, still loosing small amounts of water through their bark, but at the risk of too little or no carbon gain when leaf-less. Seven species studied here have good developed green cortex tissue on stems and axes, as especially evident for the "bottle tree" Ceiba trischistandra (A. Gray) Bakhuisen (Bombacaceae). In several leaf-less tree species at the end of summer drought, when xylem sap flows are very low, indications of higher xylem flows at night as compared to day-time were found, which led to the question of whether the trees are capable of performing CAM in their axes. However, although quite low in some cases, the pH of the cortex tissues did not fluctuate diurnally. In addition, no night-time carbon uptake could be observed. Although no net carbon gain was measured in C. trischistandra and Erythrina smithiana Krukoff (Fabaceae) photosynthetic activity of the green cortex was sufficient to re-assimilate between 50\% to 60\% of the carbon released by mitochondrial respiration. In contrast, the obligate CAM plant Cereus diffusus (Britton \& Rose) Werdermann (Cactaceae), which was studied as a reference in the same environment, showed both diurnal pH-fluctuations in its green tissue with lowest values before sun rise, and net carbon fixation at night.}, language = {en} } @incollection{BensFelixHenningsen, author = {Bens, Oliver and Felix-Henningsen, Peter}, title = {Variability of litter decomposition and nitrogen turnover in different Scots pine (Pinus sylvestris) ecosystems in Northwest Germany under the influence of groundwater lowering}, language = {en} }