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Type: Artigo
Title: Convergence of soil nitrogen isotopes across global climate gradients
Author: Craine, Joseph M.
Elmore, Andrew J.
Wang, Lixin
Augusto, Laurent
Baisden, W. Troy
Brookshire, E. N. J.
Cramer, Michael D.
Hasselquist, Niles J.
Hobbie, Erik A.
Kahmen, Ansgar
Koba, Keisuke
Kranabetter, J. Marty
Mack, Michelle C.
Marin-Spiotta, Erika
Mayor, Jordan R.
McLauchlan, Kendra K.
Michelsen, Anders
Nardoto, Gabriela B.
Oliveira, Rafael S.
Perakis, Steven S.
Peri, Pablo L.
Quesada, Carlos A.
Richter, Andreas
Schipper, Louis A.
Stevenson, Bryan A.
Tumer, Benjamin L.
Viani, Ricardo A. G.
Wanek, Wolfgang
Zeller, Bernd
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 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
Subject: Matéria orgânica do solo
Country: Reino Unido
Editor: Springer
Rights: Aberto
Identifier DOI: 10.1038/srep08280
Date Issue: 2015
Appears in Collections:IB - Artigos e Outros Documentos

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