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  Foliar and soil δ15N values reveal increased nitrogen partitioning among species in diverse grassland communities

Gubsch, M., Roscher, C., Gleixner, G., Habekost, M., Lipowsky, A., Schmid, B., et al. (2011). Foliar and soil δ15N values reveal increased nitrogen partitioning among species in diverse grassland communities. Plant, Cell and Environment, 34, 895-908. doi:10.1111/j.1365-3040.2011.02287.x.

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Gubsch, M., Autor
Roscher, C.1, Autor           
Gleixner, Gerd2, Autor           
Habekost, Maike2, Autor           
Lipowsky, A.3, Autor           
Schmid, B., Autor
Schulze, E. D.1, Autor           
Steinbeiss, Sibylle2, Autor           
Buchmann, N., Autor
Affiliations:
1Emeritus Group, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497756              
2Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497775              
3Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497752              

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 Zusammenfassung: Plant and soil nitrogen isotope ratios (d15N) were studied in experimental grassland plots of varying species richness. We hypothesized that partitioning of different sources of soil nitrogen among four plant functional groups (legumes, grasses, small herbs, tall herbs) should increase with diversity. Four years after sowing, all soils were depleted in 15N in the top 5 cm whereas in non-legume plots soils were enriched in 15N at 5–25 cm depth. Decreasing foliar d15N and Dd15N (= foliar d15N - soil d15N) values in legumes indicated increasing symbiotic N2 fixation with increasing diversity. In grasses, foliar Dd15N also decreased with increasing diversity suggesting enhanced uptake of N depleted in 15N. Foliar Dd15N values of small and tall herbs were unaffected by diversity. Foliar Dd15N values of grasses were also reduced in plots containing legumes, indicating direct use of legume-derived N depleted in 15N. Increased foliar N concentrations of tall and small herbs in plots containing legumes without reduced foliar d15N indicated that these species obtained additional mineral soil N that was not consumed by legumes. These functional group and species specific shifts in the uptake of different N sources with increasing diversity indicate complementary resource use in diverse communities.

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 Datum: 2011
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1111/j.1365-3040.2011.02287.x
Anderer: BGC1539
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Titel: Plant, Cell and Environment
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford, England : Blackwell Science
Seiten: - Band / Heft: 34 Artikelnummer: - Start- / Endseite: 895 - 908 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925471334
ISSN: 0140-7791