Centennial-scale reductions in nitrogen availability in temperate forests of the United States

Abstract Forests cover 30% of the terrestrial Earth surface and are a major component of the global carbon (C) cycle. Humans have doubled the amount of global reactive nitrogen (N), increasing deposition of N onto forests worldwide. However, other global changes—especially climate change and elevate...

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Autores principales:	K. K. McLauchlan, L. M. Gerhart, J. J. Battles, J. M. Craine, A. J. Elmore, P. E. Higuera, M. C. Mack, B. E. McNeil, D. M. Nelson, N. Pederson, S. S. Perakis
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/639f19b344514aa2b82413a9e552ec88
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spelling	oai:doaj.org-article:639f19b344514aa2b82413a9e552ec882021-12-02T16:06:14ZCentennial-scale reductions in nitrogen availability in temperate forests of the United States10.1038/s41598-017-08170-z2045-2322https://doaj.org/article/639f19b344514aa2b82413a9e552ec882017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08170-zhttps://doaj.org/toc/2045-2322Abstract Forests cover 30% of the terrestrial Earth surface and are a major component of the global carbon (C) cycle. Humans have doubled the amount of global reactive nitrogen (N), increasing deposition of N onto forests worldwide. However, other global changes—especially climate change and elevated atmospheric carbon dioxide concentrations—are increasing demand for N, the element limiting primary productivity in temperate forests, which could be reducing N availability. To determine the long-term, integrated effects of global changes on forest N cycling, we measured stable N isotopes in wood, a proxy for N supply relative to demand, on large spatial and temporal scales across the continental U.S.A. Here, we show that forest N availability has generally declined across much of the U.S. since at least 1850 C.E. with cool, wet forests demonstrating the greatest declines. Across sites, recent trajectories of N availability were independent of recent atmospheric N deposition rates, implying a minor role for modern N deposition on the trajectory of N status of North American forests. Our results demonstrate that current trends of global changes are likely to be consistent with forest oligotrophication into the foreseeable future, further constraining forest C fixation and potentially storage.K. K. McLauchlanL. M. GerhartJ. J. BattlesJ. M. CraineA. J. ElmoreP. E. HigueraM. C. MackB. E. McNeilD. M. NelsonN. PedersonS. S. PerakisNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q K. K. McLauchlan L. M. Gerhart J. J. Battles J. M. Craine A. J. Elmore P. E. Higuera M. C. Mack B. E. McNeil D. M. Nelson N. Pederson S. S. Perakis Centennial-scale reductions in nitrogen availability in temperate forests of the United States
description	Abstract Forests cover 30% of the terrestrial Earth surface and are a major component of the global carbon (C) cycle. Humans have doubled the amount of global reactive nitrogen (N), increasing deposition of N onto forests worldwide. However, other global changes—especially climate change and elevated atmospheric carbon dioxide concentrations—are increasing demand for N, the element limiting primary productivity in temperate forests, which could be reducing N availability. To determine the long-term, integrated effects of global changes on forest N cycling, we measured stable N isotopes in wood, a proxy for N supply relative to demand, on large spatial and temporal scales across the continental U.S.A. Here, we show that forest N availability has generally declined across much of the U.S. since at least 1850 C.E. with cool, wet forests demonstrating the greatest declines. Across sites, recent trajectories of N availability were independent of recent atmospheric N deposition rates, implying a minor role for modern N deposition on the trajectory of N status of North American forests. Our results demonstrate that current trends of global changes are likely to be consistent with forest oligotrophication into the foreseeable future, further constraining forest C fixation and potentially storage.
format	article
author	K. K. McLauchlan L. M. Gerhart J. J. Battles J. M. Craine A. J. Elmore P. E. Higuera M. C. Mack B. E. McNeil D. M. Nelson N. Pederson S. S. Perakis
author_facet	K. K. McLauchlan L. M. Gerhart J. J. Battles J. M. Craine A. J. Elmore P. E. Higuera M. C. Mack B. E. McNeil D. M. Nelson N. Pederson S. S. Perakis
author_sort	K. K. McLauchlan
title	Centennial-scale reductions in nitrogen availability in temperate forests of the United States
title_short	Centennial-scale reductions in nitrogen availability in temperate forests of the United States
title_full	Centennial-scale reductions in nitrogen availability in temperate forests of the United States
title_fullStr	Centennial-scale reductions in nitrogen availability in temperate forests of the United States
title_full_unstemmed	Centennial-scale reductions in nitrogen availability in temperate forests of the United States
title_sort	centennial-scale reductions in nitrogen availability in temperate forests of the united states
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/639f19b344514aa2b82413a9e552ec88
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Centennial-scale reductions in nitrogen availability in temperate forests of the United States

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