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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., Author
Roscher, C.1, Author           
Gleixner, Gerd2, Author           
Habekost, Maike2, Author           
Lipowsky, A.3, Author           
Schmid, B., Author
Schulze, E. D.1, Author           
Steinbeiss, Sibylle2, Author           
Buchmann, N., Author
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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 Abstract: 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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 Dates: 2011
 Publication Status: Issued
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 Identifiers: DOI: 10.1111/j.1365-3040.2011.02287.x
Other: BGC1539
PII: 545
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Title: Plant, Cell and Environment
Source Genre: Journal
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Publ. Info: Oxford, England : Blackwell Science
Pages: - Volume / Issue: 34 Sequence Number: - Start / End Page: 895 - 908 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925471334
ISSN: 0140-7791