Willinghöfer, Sandra

[["dc.bibliographiccitation.firstpage","6633"],["dc.bibliographiccitation.issue","23"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","6656"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Babel, Wolfgang"],["dc.contributor.author","Biermann, Tobias"],["dc.contributor.author","Falge, E."],["dc.contributor.author","Seeber, Elke"],["dc.contributor.author","Ingrisch, Johannes"],["dc.contributor.author","Schleuss, Per Marten"],["dc.contributor.author","Gerken, Tobias"],["dc.contributor.author","Leonbacher, J."],["dc.contributor.author","Leipold, Thomas"],["dc.contributor.author","Willinghöfer, S."],["dc.contributor.author","Schützenmeister, Klaus"],["dc.contributor.author","Shibistova, Olga"],["dc.contributor.author","Becker, L."],["dc.contributor.author","Hafner, Silke"],["dc.contributor.author","Spielvogel, S."],["dc.contributor.author","Li, Xiaogang"],["dc.contributor.author","Sun, Yue"],["dc.contributor.author","Zhang, L."],["dc.contributor.author","Yang, Yongping"],["dc.contributor.author","Ma, Yaoming"],["dc.contributor.author","Wesche, Karsten"],["dc.contributor.author","Graf, Hans-F."],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.author","Guggenberger, Georg"],["dc.contributor.author","Kuzyakov, Yakov"],["dc.contributor.author","Miehe, Georg"],["dc.contributor.author","Foken, Thomas"],["dc.date.accessioned","2018-07-30T14:03:40Z"],["dc.date.available","2018-07-30T14:03:40Z"],["dc.date.issued","2014"],["dc.description.abstract","The Tibetan Plateau has a significant role with regard to atmospheric circulation and the monsoon in particular. Changes between a closed plant cover and open bare soil are one of the striking effects of land use degradation observed with unsustainable range management or climate change, but experiments investigating changes of surface properties and processes together with atmospheric feedbacks are rare and have not been undertaken in the world's two largest alpine ecosystems, the alpine steppe and the Kobresia pygmaea pastures of the Tibetan Plateau. We connected measurements of micro-lysimeter, chamber, 13C labelling, and eddy covariance and combined the observations with land surface and atmospheric models, adapted to the highland conditions. This allowed us to analyse how three degradation stages affect the water and carbon cycle of pastures on the landscape scale within the core region of the Kobresia pygmaea ecosystem. The study revealed that increasing degradation of the Kobresia turf affects carbon allocation and strongly reduces the carbon uptake, compromising the function of Kobresia pastures as a carbon sink. Pasture degradation leads to a shift from transpiration to evaporation while a change in the sum of evapotranspiration over a longer period cannot be confirmed. The results show an earlier onset of convection and cloud generation, likely triggered by a shift in evapotranspiration timing when dominated by evaporation. Consequently, precipitation starts earlier and clouds decrease the incoming solar radiation. In summary, the changes in surface properties by pasture degradation found on the highland have a significant influence on larger scales."],["dc.identifier.doi","10.5194/bg-11-6633-2014"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11933"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15216"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0"],["dc.title","Pasture degradation modifies the water and carbon cycles of the Tibetan highlands"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","330"],["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Göbel, Leonie"],["dc.contributor.author","Coners, Heinz"],["dc.contributor.author","Hertel, Dietrich"],["dc.contributor.author","Willinghöfer, Sandra"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2019-07-09T11:51:18Z"],["dc.date.available","2019-07-09T11:51:18Z"],["dc.date.issued","2019"],["dc.description.abstract","In high-elevation grasslands, plants can encounter periods with high air temperature while the soil remains cold, which may lead to a temporary mismatch in the physiological activity of leaves and roots. In a climate chamber experiment with graminoid species from three elevations (4400, 2400, and 250 m a.s.l.), we tested the hypothesis that soil temperature can influence photosynthesis and stomatal conductance independently of air temperature. Soil monoliths with swards of Kobresia pygmaea (high alpine), Nardus stricta (lower alpine), and Deschampsia flexuosa (upper lowland) were exposed to soil temperatures of 25, 15, 5, and -2°C and air temperatures of 20 and 10°C for examining the effect of independent soil and air temperature variation on photosynthesis, leaf dark respiration, and stomatal conductance and transpiration. Soil frost (-2°C) had a strong negative effect on gas exchange and stomatal conductance in all three species, independent of the elevation of origin. Leaf dark respiration was stimulated by soil frost in D. flexuosa, but not in K. pygmaea, which also had a lower temperature optimum of photosynthesis. Soil cooling from 15 to 5°C did not significantly reduce stomatal conductance and gas exchange in any of the species. We conclude that all three graminoids are able to maintain a relatively high root water uptake in cold, non-frozen soil, but the high-alpine K. pygmaea seems to be especially well adapted to warm shoot - cold root episodes, as it has a higher photosynthetic activity at 10 than 20°C air temperature and does not up-regulate leaf dark respiration upon soil freezing, as was observed in the grasses from warmer climates."],["dc.identifier.doi","10.3389/fpls.2019.00330"],["dc.identifier.pmid","30936890"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16097"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59919"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","1664-462X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","570"],["dc.title","The Role of Low Soil Temperature for Photosynthesis and Stomatal Conductance of Three Graminoids From Different Elevations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]