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  <doc>
    <id>24436</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>223</pageFirst>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_noref</type>
    <publisherName/>
    <publisherPlace>Münster</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-10-08</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Modelling photosynthesis and carbon fluxes of moss- and lichen-dominated biological soil crusts in temperate dry acid grasslands in Brandenburg</title>
    <abstract language="eng">Top soils in temperate climates are regularly covered by cryptogames. Depending on the climatic and environmental conditions and their development stage, these biocrusts are built up by different species of cyanobacteria, bacteria, green algae, mosses, liverworts, lichens and fungi, which crosslink the uppermost soil particles. Biocrusts create a thin surface layer of high biotic activity, with high C and nutrient pools and fluxes to deeper soil layers, where the soil tends to be biotically and biogeochemically less active. Changes in soil structure, e.g. due to the accumulation of organic material and the ability of biological nitrogen fixation, result in significant feedback and control of biogeochemical processes. We analysed the response of photosynthesis and respiration to changing temperature and light in two moss-and lichen-dominated soil crusts from a dry acid grassland in the vicinity of a pine forest in Brandenburg, Germany. For the estimation of carbon fluxes, we combined lab-based CO2 gas exchange measurements and continuous determination of biocrust drying and rewetting cycles under field conditions. These experiments facilitated the development of an empirical photosynthesis model that allows for an estimation of the carbon dynamics of biological soil crusts based on their ecophysiological performance.</abstract>
    <parentTitle language="eng">GfÖ 2019, Science Meets Practice, 49th Annual Meeting of the Ecological Society of Germany, Austria and Switzerland, university of Münster, 9-13 September 2019</parentTitle>
    <identifier type="url">https://www.gfoe-conference.de/WEBS/GFOe2019.pages.download/Book_of_Abstracts2019.pdf</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <author>
      <firstName>Miriam</firstName>
      <lastName>Dietz</lastName>
    </author>
    <submitter>
      <firstName>Werner</firstName>
      <lastName>Gerwin</lastName>
    </submitter>
    <author>
      <firstName>Manfred</firstName>
      <lastName>Küppers</lastName>
    </author>
    <author>
      <firstName>Magnus</firstName>
      <lastName>Wachendorf</lastName>
    </author>
    <author>
      <firstName>Thorsten</firstName>
      <lastName>Stefan</lastName>
    </author>
    <author>
      <firstName>Maik</firstName>
      <lastName>Veste</lastName>
    </author>
    <author>
      <firstName>Stella</firstName>
      <lastName>Gypser</lastName>
    </author>
    <collection role="institutes" number="2402H01">FG Bodenschutz und Rekultivierung (ehemals)</collection>
  </doc>
  <doc>
    <id>25771</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>1</pageNumber>
    <edition/>
    <issue/>
    <volume>2019</volume>
    <type>conferenceobject_noref</type>
    <publisherName/>
    <publisherPlace>North Stradbroke Island, Queensland , Australia</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-06-29</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Monitoring of biocrust development and physiological activity in disturbed ecosystems in Central Europe</title>
    <abstract language="eng">In many ecosystems of the earth, biocrusts influence the successive development of vegetation through their influence on the soil formation. This change in soil structure, e.g. due to the accumulation of organic material and the ability of biological nitrogen fixation, results in significant feedback and controls of ecosystem processes, especially in arid regions. In Brandenburg, located in NE Germany, the dry grasslands on sand dunes and the post-mining landscapes, characterized by edaphic drought and lack of nutrients as well as disturbances, are ecologically interesting locations for investigations of the biocrusts. In recent years, the species composition, structure, N-fixation, C-fluxes, and accumulation as well as their soil hydrological properties of biocrusts have been characterized and ecophysiological measurements of biocrust activity and CO2 exchange of different biocrust types under standardized environmental conditions have been performed in the laboratory. These ecophysiological measurements were correlated for the first time with NDVI measurements using a modified consumer camera, thus enabling a spatial analysis of the photosynthesis hotspots and a transfer from the lab into the landscape. The development and physiological activity of biocrusts are significantly influenced by microclimatic boundary conditions and moisture-dry cycles. The duration of these moisture phases is decisive for their spatial and temporal development and for the differentiation of the developmental stages. The permanent recording of moisture in the biocrusts in the uppermost millimeters using a newly developed biocrust wetness sensor in combination with NDVI measurements enable detailed information about biocrust activities and carbon fluxes. These continuous measurements of NDVI and physiological activity with PRI sensors allows determining seasonal activity phases in relation to microclimatological site conditions. More recent technological developments in sensor technology make it possible to carry out detailed and cost-effective investigations of the biocrust activity over the course of the year.</abstract>
    <parentTitle language="eng">Biocrust 4 - 4th International Workshop on Biological Soil Crusts</parentTitle>
    <identifier type="doi">10.13140/RG.2.2.11042.99523</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <author>
      <firstName>Stella</firstName>
      <lastName>Gypser</lastName>
    </author>
    <submitter>
      <firstName>Stella</firstName>
      <lastName>Gypser</lastName>
    </submitter>
    <author>
      <firstName>Miriam</firstName>
      <lastName>Diez</lastName>
    </author>
    <author>
      <firstName>Daniel</firstName>
      <lastName>Boelli</lastName>
    </author>
    <author>
      <firstName>Magnus</firstName>
      <lastName>Wachendorf</lastName>
    </author>
    <author>
      <firstName>Manfred</firstName>
      <lastName>Küppers</lastName>
    </author>
    <author>
      <firstName>Maik</firstName>
      <lastName>Veste</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>biological soil crusts</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>physiological activity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>ecosystem development</value>
    </subject>
    <collection role="institutes" number="2402H01">FG Bodenschutz und Rekultivierung (ehemals)</collection>
  </doc>
</export-example>
