Long-term warming increased carbon sequestration capacity in a humid subtropical forest,Global Change Biology

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Long-term warming increased carbon sequestration capacity in a humid subtropical forest
Global Change Biology ( IF 10.8 ) Pub Date : 2023-12-11 , DOI: 10.1111/gcb.17072
Xujun Liu _{1,

2} , Zhiyang Lie _{1,

2} , Peter B Reich ₃ , Guoyi Zhou ₁ , Junhua Yan _{1,

2} , Wenjuan Huang _{4,

5} , Yingping Wang ₆ , Josep Peñuelas _{7,

8} , David T Tissue ₉ , Mengdi Zhao _{1,

2} , Ting Wu _{1,

2} , Donghai Wu _{1,

2} , Wenfang Xu _{1,

2} , Yuelin Li _{1,

2} , Xuli Tang _{1,

2} , Shuyidan Zhou _{1,

2} , Ze Meng _{1,

2} , Shizhong Liu _{1,

2} , Guowei Chu _{1,

2} , Deqiang Zhang _{1,

2} , Qianmei Zhang _{1,

2} , Xinhua He _{1,

10,

11} , Juxiu Liu _{1,

2}

Affiliation

Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Institute for Global Change Biology and School for Environment and Sustainability, University of Michigan, Ann Arbor, Michigan, USA.
Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, Iowa, USA.
School of Integrative Plant Science, Cornell University, Ithaca, New York, USA.
CSIRO Oceans and Atmosphere, Aspendale, Victoria, Australia.
CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Catalonia, Spain.
CREAF, Barcelona, Catalonia, Spain.
Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales, Australia.
School of Biological Sciences, University of Western Australia, Perth, Western Australia, Australia.
Department of Land, Air and Water Resources, University of California at Davis, Davis, California, USA.

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.

更新日期：2023-12-12

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