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The biodiversity - N cycle relationship: a $^{15}$N tracer experiment with soil from plant mixtures of varying diversity to model N pool sizes and transformation rates [in press]

Lama, Soni; Kuhn, Thomas; Lehmann, Moritz F.; Müller, Christoph; Gonzalez, Odette; Eisenhauer, Nico; Lange, Markus; Scheu, Stefan; Oelmann, Yvonne; Wilcke, Wolfgang

Abstract:
We conducted a $^{15}$N tracer experiment in laboratory microcosms with field-fresh soil samples from a biodiversity xperiment to evaluate the relationship between grassland biodiversity and N cycling. To embrace the complexity of the N cycle, we determined N exchange between five soil N pools (labile and recalcitrant organic N, dissolved NH$_{4}$$^{+}$ and NO3$^{-}$ in soil solution, and exchangeable NH$_{4}$$^{+}$) and eight N transformations (gross N mineralization from labile and recalcitrant organic N, NH$_{4}$$^{+}$ immobilization into labile and recalcitrant organic N, autotrophic nitrification, heterotrophic nitrification, NO$_{3}$$^{-}$ immobilization, adsorption of NH$_{4}$$^{+}$) expected in aerobic soils with the help of the N-cycle model Ntrace. We used grassland soil of the Jena Experiment, which includes plant mixtures with 1 to 60 species and 1 to 4 functional groups (legumes, grasses, tall herbs, small herbs). The 19 soil samples of one block of the Jena Experiment were labeled with either 15NH$_{4}$$^{+}$ or 15NO3- or both. In the presence of legumes, gross N mineralization and autotrophic nitrification increased significantly because of higher soil N concentrations in legume-containing plots and high microbial activity. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000121062
Veröffentlicht am 08.07.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0178-2762, 1432-0789
KITopen-ID: 1000121062
Erschienen in Biology and fertility of soils
Vorab online veröffentlicht am 13.06.2020
Nachgewiesen in Scopus
Web of Science
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