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Pàgina inicial > Articles > Articles publicats > Global forest carbon uptake due to nitrogen and phosphorus deposition from 1850 to 2100 |
Data: | 2017 |
Resum: | 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 (∆Cν dep), based on the retention of deposited nutrients, their allocation within plants, and C:N and C:P stoichiometry. ∆Cν dep for 1997-2013 was estimated to be 0. 27 ± 0. 13 Pg C year−1 from N and 0. 054 ± 0. 10 Pg C year−1 from P, contributing 9% and 2% of the terrestrial C sink, respectively. Sensitivity tests show that uncertainty of ∆Cν dep was larger from P than from N, mainly due to uncertainty in the fraction of deposited P that is fixed by soil. ∆CP dep was exceeded by ∆CN dep 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. |
Ajuts: | European Commission 610028 European Commission 628735 |
Nota: | Agraïments: The authors thank Ether/ECCAD for the distribution of emissions used in this study. This study was funded by FABIO, a Marie Curie International Incoming Fellowship funded by the European Commission (Project No 628735) and the IMBALANCE-P project of the European Research Council (ERC-2013-SyG-610028). The simulations were performed using DSM-CCRT resources under the GENCI (Grand Equipement National de Calcul Intensif) allocation of computer time (grant 2016-t2014012201). |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Aerosol ; Forest carbon sink ; Nitrogen deposition ; Nutrient limitation ; Nutrient retention ; Phosphorus deposition ; Stoichiometry |
Publicat a: | Global change biology, Vol. 23, issue 11 (Nov. 2017) , p. 4854-4872, ISSN 1365-2486 |
Post-print 33 p, 2.0 MB |