Atmospheric deposition, CO₂, and change in the land carbon sink
Fernández-Martínez, Marcos (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Vicca, Sara (Universiteit Antwerpen. Departement Biologie)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Janssens, Ivan (Universiteit Antwerpen. Departement Biologie)
Ciais, Philippe (Laboratoire des Sciences du Climat et de l'Environnement)
Obersteiner, Michael (International Institute for Applied Systems Analysis (Àustria))
Bartrons Vilamala, Mireia (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Verger, Aleixandre (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Canadell, Josep G. (Global Carbon Project)
Chevallier, Frédéric (Laboratoire des Sciences du Climat et de L'Environnement)
Wang, Xuhui (Sino-French Institute for Earth System Science)
Bernhofer, Christian (Technische Universität Dresden. Institut für Hydrologie und Meteorologie)
Curtis, Peter S. (The Ohio State University. Department of Evolution, Ecology, and Organismal Biology)
Gianelle, Daminao (Fondazione Edmund Mach. Istituto agrario di San Michele all'Adige)
Grünwald, Thomas (Technische Universität Dresden. Institut für Hydrologie und Meteorologie)
Heinesch, Bernhard (Université de Liege. Gembloux Agro-Bio Tech)
Ibrom, Andreas (Danmarks Tekniske Universitet. Department of Environmental Engineering)
Knohl, Alexander (Georg-August University of Göttingen. Faculty of Forest Sciences and Forest Ecology)
Laurila, Tuomas (Ilmatieteen laitos)
Law, Beverly (Oregon State University. Department of Forest Ecosystems & Society)
Limousin, Jean-Marc (Centre d'Ecologie Fonctionnelle et Evolutive)
Longdoz, Bernard (Université de Lorraine)
Loustau, Denis (Institut national de la recherche agronomique. Interactions Sol Plante Atmosphère)
Mammarella, Ivan (Helsingfors Universitet. Department of Physics)
Matteucci, Giorgio (Consiglio Nazionale delle Ricerche. Istituto di Biologia Agroambientale e Forestale)
Monson, Russell K. (University of Arizona. School of Natural Resources and the Environment)
Montagnani, Leonardo (Libera Università di Bolzano. Facoltà di Scienze e Tecnologie informatiche)
Moors, Eddy J. (Universiteit van Amsterdam)
Munger, J. William (Harvard University. School of Engineering and Applied Sciences)
Papale, Dario (Università degli studi della Tuscia. Dipartimento per l'Innovazione dei sistemi biologici, agroalimentari e forestali)
Piao, Shilonog Long (Sino-French Institute for Earth System Science)

Data:	2017
Resum:	Concentrations of atmospheric carbon dioxide (CO₂) have continued to increase whereas atmospheric deposition of sulphur and nitrogen has declined in Europe and the USA during recent decades. Using time series of flux observations from 23 forests distributed throughout Europe and the USA, and generalised mixed models, we found that forest-level net ecosystem production and gross primary production have increased by 1% annually from 1995 to 2011. Statistical models indicated that increasing atmospheric CO₂ was the most important factor driving the increasing strength of carbon sinks in these forests. We also found that the reduction of sulphur deposition in Europe and the USA lead to higher recovery in ecosystem respiration than in gross primary production, thus limiting the increase of carbon sequestration. By contrast, trends in climate and nitrogen deposition did not significantly contribute to changing carbon fluxes during the studied period. Our findings support the hypothesis of a general CO₂-fertilization effect on vegetation growth and suggest that, so far unknown, sulphur deposition plays a significant role in the carbon balance of forests in industrialized regions. Our results show the need to include the effects of changing atmospheric composition, beyond CO₂, to assess future dynamics of carbon-climate feedbacks not currently considered in earth system/climate modelling.
Ajuts:	European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR--274
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Carbon cycle ; Climate-change ecology ; Forest ecology
Publicat a:	Scientific reports, Vol. 7, art. 9632 (2017) , ISSN 2045-2322

DOI: 10.1038/s41598-017-08755-8
PMID: 28851977

13 p, 3.2 MB

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