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  Foliar δ 15N values characterize soil N cycling and reflect nitrate or ammonium preference of plants along a temperate grassland gradient

Kahmen, A., Wanek, W., & Buchmann, N. (2008). Foliar δ 15N values characterize soil N cycling and reflect nitrate or ammonium preference of plants along a temperate grassland gradient. Oecologia, 156(4), 861-870. doi:10.1007/s00442-008-1028-8.

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BGC1135.pdf (Publisher version), 340KB
 
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Kahmen, A.1, Author           
Wanek, W., Author
Buchmann, N.1, Author           
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1Research Group Biodiversity Ecosystem, Dr. N. Buchmann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497759              

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Free keywords: Stable isotopes Mineral nutrition Competition Nitrogen Mineralization Biodiversity N-15 natural-abundance Extensively managed grassland Nitrogen isotope composition Sub-arctic plants Mycorrhizal fungi Forest soils Fractionation Diversity Ecosystem Dynamics
 Abstract: The natural abundance of stable N-15 isotopes in soils and plants is potentially a simple tool to assess ecosystem N dynamics. Several open questions remain, however, in particular regarding the mechanisms driving the variability of foliar delta N-15 values of non-N-2 fixing plants within and across ecosystems. The goal of the work presented here was therefore to: ( 1) characterize the relationship between soil net mineralization and variability of foliar Delta delta N-15 (delta(15)Nleaf - delta(15) Nsoil) values from 20 different plant species within and across 18 grassland sites; (2) to determine in situ if a plant's preference for NO3- - or NH4+ uptake explains variability in foliar Delta delta N-15 among different plant species within an ecosystem; and (3) test if variability in foliar Delta delta N-15 among species or functional group is consistent across 18 grassland sites. Delta delta N-15 values of the 20 different plant species were positively related to soil net mineralization rates across the 18 sites. We found that within a site, foliar Dd15N values increased with the species' NO3- to NH4+ uptake ratios. Interestingly, the slope of this relationship differed in direction from previously published studies. Finally, the variability in foliar Delta delta N-15 values among species was not consistent across 18 grassland sites but was significantly influenced by N mineralization rates and the abundance of a particular species in a site. Our findings improve the mechanistic understanding of the commonly observed variability in foliar Delta delta N-15 among different plant species. In particular we were able to show that within a site, foliar delta N-15 values nicely reflect a plant's N source but that the direction of the relationship between NO3- to NH4+ uptake and foliar Delta delta N-15 values is not universal. Using a large set of data, our study highlights that foliar Delta delta N-15 values are valuable tools to assess plant N uptake patterns and to characterize the soil N cycle across different ecosystems. [References: 45]

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 Dates: 2008
 Publication Status: Issued
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 Identifiers: DOI: 10.1007/s00442-008-1028-8
Other: BGC1135
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Title: Oecologia
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag.
Pages: - Volume / Issue: 156 (4) Sequence Number: - Start / End Page: 861 - 870 Identifier: ISSN: 0029-8549
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000265440