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| Titel |
Plant species richness increases phosphatase activities in an experimental grassland |
| VerfasserIn |
Nina Hacker, Wolfgang Wilcke, Yvonne Oelmann |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093474
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| Publikation (Nr.) |
 EGU/EGU2014-8222.pdf |
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| Zusammenfassung |
| Plant species richness has been shown to increase aboveground nutrient uptake
requiring the mobilization of soil nutrient pools. For phosphorus (P) the underlying
mechanisms for increased P release in soil under highly diverse grassland mixtures
remain obscure because aboveground P storage and concentrations of inorganic
and organic P in soil solution and differently reactive soil P pools are unrelated
(Oelmann et al. 2011). The need of plants and soil microorganisms for P can increase
the exudation of enzymes hydrolyzing organically bound P (phosphatases) which
might represent an important release mechanism of inorganic P in a competitive
environment such as highly diverse grassland mixtures. Our objectives were to
test the effects of i) plant functional groups (legumes, grasses, non-leguminous
tall and small herbs), and of (ii) plant species richness on microbial P (Pmic) and
phosphatase activities in soil. In autumn 2013, we measured Pmic and alkaline
phosphomonoesterase and phosphodiesterase activities in soil of 80 grassland mixtures
comprising different community compositions and species richness (1, 2, 4, 8, 16, 60) in the
Jena Experiment.
In general, Pmic and enzyme activities were correlated (r=0.59 and 0.46 for
phosphomonoesterase and phosphodiesterase activities, respectively; p |
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