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Convergence of soil nitrogen isotopes across global climate gradients

Craine, Joseph M. and Elmore, Andrew J. and Wang, Lixin and Augusto, Laurent and Baisden, W. Troy and Brookshire, E. N. J. and Cramer, Michael D. and Hasselquist, Niles J. and Hobbie, Erik A. and Kahmen, Ansgar and Koba, Keisuke and Kranabetter, J. Marty and Mack, Michelle C. and Marin-Spiotta, Erika and Mayor, Jordan R. and McLauchlan, Kendra K. and Michelsen, Anders and Nardoto, Gabriela B. and Oliveira, Rafael S. and Perakis, Steven S. and Peri, Pablo L. and Quesada, Carlos A. and Richter, Andreas and Schipper, Louis A. and Stevenson, Bryan A. and Turner, Benjamin L. and Viani, Ricardo A. G. and Wanek, Wolfgang and Zeller, Bernd. (2015) Convergence of soil nitrogen isotopes across global climate gradients. Scientific Reports, 5 (8280).

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Abstract

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 (15)N:(14)N 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 (15)N than in corresponding cold ecosystems or wet ecosystems. Below a MAT of 9.8°C, soil δ(15)N 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 δ(15)N 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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Botanik > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Nature Publishing Group
e-ISSN:2045-2322
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:12 Oct 2017 09:40
Deposited On:05 Jun 2015 08:53

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