Pervasive decreases in living vegetation carbon turnover time across forest climate zones
Yu, Kailiang (University of Utah)
Smith, William K. (University of Arizona)
Trugman, Anna T. (University of Utah)
Condit, Richard (The Morton Arboretum)
Hubbell, Stephen P. (The Morton Arboretum)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peng, Changhui (Université du Québec à Montréal. Department of Biological Sciences)
Zhu, Kai (University of California)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Cailleret, Maxime (Eidgenössische Technische Hochschule Zürich. Institute of Terrestrial Ecosystems)
Levanic, Tom (Slovenian Forestry Institute)
Gessler, Arthur (The Swiss Federal Institute for Forest Snow and Landscape Research)
Schaub, Marcus (The Swiss Federal Institute for Forest Snow and Landscape Research)
Ferretti, Marco (The Swiss Federal Institute for Forest Snow and Landscape Research)
Anderegg, William R. L. (Universty of Utah. Department of Biology)

Data:	2019
Resum:	Forests play a major role in the global carbon cycle. Previous studies on the capacity of forests to sequester atmospheric CO2 have mostly focused on carbon uptake, but the roles of carbon turnover time and its spatiotemporal changes remain poorly understood. Here, we used long-term inventory data (1955 to 2018) from 695 mature forest plots to quantify temporal trends in living vegetation carbon turnover time across tropical, temperate, and cold climate zones, and compared plot data to 8 Earth system models (ESMs). Long-term plots consistently showed decreases in living vegetation carbon turnover time, likely driven by increased tree mortality across all major climate zones. Changes in living vegetation carbon turnover time were negatively correlated with CO2 enrichment in both forest plot data and ESM simulations. However, plot-based correlations between living vegetation carbon turnover time and climate drivers such as precipitation and temperature diverged from those of ESM simulations. Our analyses suggest that forest carbon sinks are likely to be constrained by a decrease in living vegetation carbon turnover time, and accurate projections of forest carbon sink dynamics will require an improved representation of tree mortality processes and their sensitivity to climate in ESMs.
Ajuts:	European Commission 610028
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Carbon cycle ; Carbon turnover ; Forest carbon stocks ; Forest productivity ; Tree mortality
Publicat a:	Proceedings of the National Academy of Sciences of the United States of America, Vol. 116, Issue 49 (December 2019) , p. 24662-24667, ISSN 1091-6490

DOI: 10.1073/pnas.1821387116
PMID: 31740604

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