Long-term warming increased carbon sequestration capacity in a humid subtropical forest
Liu, Xujun (Chinese Academy of Sciences)
Lie, Zhiyang (Chinese Academy of Sciences)
Reich, Peter (University of Michigan. Institute for Global Change Biology)
Zhou, Guoyi (Chinese Academy of Sciences)
Yan, Junhua (Chinese Academy of Sciences)
Huang, Wenjuan (Iowa State University. Department of Ecology, Evolution, and Organismal Biology)
Wang, Ying-Ping (CSIRO Oceans and Atmosphere)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Tissue, D. (Western Sydney University)
Zhao, Mengdi (Chinese Academy of Sciences)
Wu, Ting (Chinese Academy of Sciences)
Wu, Donghai (Chinese Academy of Sciences)
Xu, Wenfang (Chinese Academy of Sciences)
Li, Yuelin (Chinese Academy of Sciences)
Tang, Xuli (Chinese Academy of Sciences)
Zhou, Shuyidan (Chinese Academy of Sciences)
Meng, Ze (Chinese Academy of Sciences)
Liu, Shizhong (Chinese Academy of Sciences)
Chu, Guowei (Chinese Academy of Sciences)
Zhang, Deqiang (Chinese Academy of Sciences)
Zhang, Qianmei (Chinese Academy of Sciences)
He, Xinhua (University of California. Department of Land, Air and Water Resources)
Liu, Juxiu (Chinese Academy of Sciences)

Data:	2024
Resum:	Tropical and subtropical forests play a crucial role in global carbon (C) pools, and their responses to warming can significantly impact C-climate feedback and predictions of future global warming. Despite earth system models projecting reductions in land C storage with warming, the magnitude of this response varies greatly between models, particularly in tropical and subtropical regions. Here, we conducted a field ecosystem-level warming experiment in a subtropical forest in southern China, by translocating mesocosms (ecosystem composed of soils and plants) across 600 m elevation gradients with temperature gradients of 2. 1°C (moderate warming), to explore the response of ecosystem C dynamics of the subtropical forest to continuous 6-year warming. Compared with the control, the ecosystem C stock decreased by 3. 8% under the first year of 2. 1°C warming; but increased by 13. 4% by the sixth year of 2. 1°C warming. The increased ecosystem C stock by the sixth year of warming was mainly attributed to a combination of sustained increased plant C stock due to the maintenance of a high plant growth rate and unchanged soil C stock. The unchanged soil C stock was driven by compensating and offsetting thermal adaptation of soil microorganisms (unresponsive soil respiration and enzyme activity, and more stable microbial community), increased plant C input, and inhibitory C loss (decreased C leaching and inhibited temperature sensitivity of soil respiration) from soil drying. These results suggest that the humid subtropical forest C pool would not necessarily diminish consistently under future long-term warming. We highlight that differential and asynchronous responses of plant and soil C processes over relatively long-term periods should be considered when predicting the effects of climate warming on ecosystem C dynamics of subtropical forests.
Ajuts:	Ministerio de Ciencia e Innovación TED2021-132627B-I00 Ministerio de Ciencia e Innovación PID2022-140808NB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-1333
Nota:	Altres ajuts: Fundación Ramón Areces Grant CIVP20A6621
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Global change biology, Vol. 30, Issue 1 (January 2024) , art. e17072, ISSN 1365-2486

DOI: 10.1111/gcb.17072

Disponible a partir de: 2025-01-31 Postprint

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