Description: Das Projekt "Impact of warming on the direct uptake of amino acids and peptides by herbaceous plant species" wird vom Umweltbundesamt gefördert und von University Manchester, Department of of Environmental Biology, School of Biological Sciences durchgeführt. It has been shown that in low-productive ecosystems, for example due to temperature limitation, microbial soil processes are often inhibited and therefore, organic forms become an important N source for plants. Thereby, it has been shown that low-fertile species take up more N in organic form than high-fertile species. However, plant nitrogen (N) uptake has traditionally been studied in the context of inorganic N use, namely ammonium (NH4+) and nitrate (NO3-). In contrast, the knowledge about the uptake of organic N is restricted to only few, low-weight amino acids. Hardly anything is known about the direct uptake of complex organic forms as peptides. Due to global change, air and soil temperatures are predicted to increase by about 2 - 4 C and therefore, temperature-limited soil N and C cycles will be enhanced. We expect that the availability of inorganic N, in relation to organic N, and decomposition rates of organic matter will increase. However, warming effects on soil N concentrations and the N forms taken up by plants, especially in respect of complex amino acids and peptides, have not been studied yet. Further, there are knowledge gaps in interaction processes between N and C cycles and the consequences on low-productivity grasslands to sequester C under a warmer climate. To evaluate the potential of organic N uptake (amino acids and peptides) by different herbaceous plant species, each with different requirements to soil nutrient availability, a labelling experiment with 15N and 13C is proposed. If this greenhouse experiment turns out satisfactory, the results will be verified at three different field sites in England and Wales. The influence of increased temperature on the availability and uptake of organic N by one to two herbaceous species will be evaluated in an additional climate chamber experiment using 3 different temperature regimes.
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Origin: /Bund/UBA/UFORDAT
Tags: Ammonium ? Populationsdynamik ? England ? Wales ? Aminosäure ? Bodennährstoff ? Bodenstickstoff ? Süßgräser ? Peptid ? Pflanzennährstoff ? Nitrat ? Biologische Wirkung ? Organische Stickstoffverbindung ? Temperaturabhängigkeit ? Gewächshaus ? Wiese ? Pflanzenverfügbarkeit ? Bodenmikroorganismen ? Bodentemperatur ? Grünland ? Isotopentechnik ? Lufttemperatur ? Pflanzenart ? Kohlenstoffsenke ? Organisches Material ? Topographie ? Globale Erwärmung ? Kohlenstoffkreislauf ? Standortwahl ? Feldstudie ? Stickstoffkreislauf ? Vergleichsanalyse ? Schule ? Biologische Aktivität ? Ökosystemforschung ? Bodenprozess ? Bioverfügbarkeit ? Alpines Ökosystem ? Klimafolgen ? Bodenluft ? Standortbedingung ? Klimawandel ? Klimawirkung ? Ökosystem ? Interaktionsanalyse ? Pflanzenwachstum ? Prüfstand ? Stickstoffisotop ? climate chamber experiment ? Klimakammer ? Kohlenstoffisotop ? Nährstoffaufnahme ? Atmungsaktivität ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2013-03-01 - 2014-02-28
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