Global forest carbon uptake due to nitrogen and phosphorus deposition from 1850 to 2100

Medientyp: E-Artikel
Titel: Global forest carbon uptake due to nitrogen and phosphorus deposition from 1850 to 2100
Beteiligte: Wang, Rong; Goll, Daniel; Balkanski, Yves; Hauglustaine, Didier; Boucher, Olivier; Ciais, Philippe; Janssens, Ivan; Penuelas, Josep; Guenet, Bertrand; Sardans, Jordi; Bopp, Laurent; Vuichard, Nicolas; Zhou, Feng; Li, Bengang; Piao, Shilong; Peng, Shushi; Huang, Ye; Tao, Shu
Erschienen: Wiley, 2017
Erschienen in: Global Change Biology
Sprache: Englisch
DOI: 10.1111/gcb.13766
ISSN: 1354-1013; 1365-2486
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Beschreibung: <jats:title>Abstract</jats:title><jats:p>Spatial patterns and temporal trends of nitrogen (N) and phosphorus (P) deposition are important for quantifying their impact on forest carbon (C) uptake. In a first step, we modeled historical and future change in the global distributions of the atmospheric deposition of N and P from the dry and wet deposition of aerosols and gases containing N and P. Future projections were compared between two scenarios with contrasting aerosol emissions. Modeled fields of N and P deposition and P concentration were evaluated using globally distributed in situ measurements. N deposition peaked around 1990 in European forests and around 2010 in East Asian forests, and both increased sevenfold relative to 1850. P deposition peaked around 2010 in South Asian forests and increased 3.5‐fold relative to 1850. In a second step, we estimated the change in C storage in forests due to the fertilization by deposited N and P (∆C<jats:sub>ν dep</jats:sub>), based on the retention of deposited nutrients, their allocation within plants, and C:N and C:P stoichiometry. ∆C<jats:sub>ν dep</jats:sub> for 1997–2013 was estimated to be 0.27 ± 0.13 Pg C year<jats:sup>−1</jats:sup> from N and 0.054 ± 0.10 Pg C year<jats:sup>−1</jats:sup> from P, contributing 9% and 2% of the terrestrial C sink, respectively. Sensitivity tests show that uncertainty of ∆C<jats:sub>ν dep</jats:sub> was larger from P than from N, mainly due to uncertainty in the fraction of deposited P that is fixed by soil. ∆<jats:styled-content style="fixed-case">C<jats:sub>P</jats:sub></jats:styled-content> <jats:sub>dep</jats:sub> was exceeded by ∆<jats:styled-content style="fixed-case">C<jats:sub>N</jats:sub></jats:styled-content> <jats:sub>dep</jats:sub> over 1960–2007 in a large area of East Asian and West European forests due to a faster growth in N deposition than P. Our results suggest a significant contribution of anthropogenic P deposition to C storage, and additional sources of N are needed to support C storage by P in some Asian tropical forests where the deposition rate increased even faster for P than for N.</jats:p>

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