Convergence of soil nitrogen isotopes across global climate gradients

Craine, J. M.; Elmore, A. J.; Wang, L. X.; Augusto, L.; Baisden, W. T.; Brookshire, E. N. J.; Cramer, M. D.; Hasselquist, N. J.; Hobbie, E. A.; Kahmen, A.; Koba, K.; Kranabetter, J. M.; Mack, M. C.; Marin-Spiotta, E.; Mayor, J. R.; McLauchlan, Kendra K.

doi:10.1038/srep08280

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dc.contributor.author	Craine, J. M.
dc.contributor.author	Elmore, A. J.
dc.contributor.author	Wang, L. X.
dc.contributor.author	Augusto, L.
dc.contributor.author	Baisden, W. T.
dc.contributor.author	Brookshire, E. N. J.
dc.contributor.author	Cramer, M. D.
dc.contributor.author	Hasselquist, N. J.
dc.contributor.author	Hobbie, E. A.
dc.contributor.author	Kahmen, A.
dc.contributor.author	Koba, K.
dc.contributor.author	Kranabetter, J. M.
dc.contributor.author	Mack, M. C.
dc.contributor.author	Marin-Spiotta, E.
dc.contributor.author	Mayor, J. R.
dc.contributor.author	McLauchlan, Kendra K.
dc.date.accessioned	2016-04-04T22:46:14Z
dc.date.available	2016-04-04T22:46:14Z
dc.date.issued	2015-02-06
dc.date.issued	2014-11-01
dc.identifier.uri	http://hdl.handle.net/2097/32310
dc.description	Citation: Craine, J. M., Elmore, A. J., Wang, L. X., Augusto, L., Baisden, W. T., Brookshire, E. N. J., . . . Zeller, B. (2015). Convergence of soil nitrogen isotopes across global climate gradients. Scientific Reports, 5, 8. doi:10.1038/srep08280
dc.description	Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems, and climate forcing. With limited direct measures of soil N cycling at the global scale, syntheses of the N-15 : N-14 ratio of soil organic matter across climate gradients provide key insights into understanding global patterns of N cycling. In synthesizing data from over 6000 soil samples, we show strong global relationships among soil N isotopes, mean annual temperature (MAT), mean annual precipitation (MAP), and the concentrations of organic carbon and clay in soil. In both hot ecosystems and dry ecosystems, soil organic matter was more enriched in N-15 than in corresponding cold ecosystems or wet ecosystems. Below a MAT of 9.8 degrees C, soil delta N-15 was invariant with MAT. At the global scale, soil organic C concentrations also declined with increasing MAT and decreasing MAP. After standardizing for variation among mineral soils in soil C and clay concentrations, soil delta N-15 showed no consistent trends across global climate and latitudinal gradients. Our analyses could place new constraints on interpretations of patterns of ecosystem N cycling and global budgets of gaseous N loss.
dc.description	Additional Authors: Michelsen, A.;Nardoto, G. B.;Oliveira, R. S.;Perakis, S. S.;Peri, P. L.;Quesada, C. A.;Richter, A.;Schipper, L. A.;Stevenson, B. A.;Tumer, B. L.;Viani, R. A. G.;Wanek, W.;Zeller, B.
dc.relation.uri	https://doi.org/10.1038/srep08280
dc.rights	Attribution 4.0 International (CC BY 4.0)
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/
dc.subject	N-15 Natural-Abundance
dc.subject	Organic-Matter
dc.subject	Litter Decomposition
dc.subject	Inorganic
dc.subject	Nitrogen
dc.subject	Tropical Forests
dc.title	Convergence of soil nitrogen isotopes across global climate gradients
dc.type	Article
dc.date.published	2015
dc.citation.doi	10.1038/srep08280
dc.citation.issn	2045-2322
dc.citation.jtitle	Scientific Reports
dc.citation.spage	8
dc.citation.volume	5
dc.contributor.authoreid	mclauch