Carbon exchanges and their responses to temperature and precipitation in forest ecosystems in Yunnan, Southwest China
Fei, Xuehai1,2,3; Song, Qinghai1,2; Zhang, Yiping1,2; Liu, Yuntong1,2; Sha, Liqing1,2; Yu, Guirui8; Zhang, Leiming8; Duan, Changqun9; Deng, Yun1,4; Wu, Chuansheng1,5; Lu, Zhiyun1,5; Luo, Kang1,3,5; Chen, Aiguo1,6; Xu, Kun1,7; Liu, Weiwei1,7; Huang, Hua1,7; Jin, Yanqiang1,2,3; Zhou, Ruiwu1,2,3; Li, Jing1,2,3; Lin, Youxing1,2,3; Zhou, Liguo1,2,3; Fu, Yane1,3; Bai, Xiaolong1,3; Tang, Xianhui1,2,3; Gao, Jinbo1,2,3; Zhou, Wenjun1,2; Grace, John10
摘要Forest ecosystems play an increasingly important role in the global carbon cycle. However, knowledge on carbon exchanges, their spatio-temporal patterns, and the extent of the key controls that affect carbon fluxes is lacking. In this study, we employed 29-site-years of eddy covariance data to observe the state, spatio-temporal variations and climate sensitivity of carbon fluxes (gross primary productivity (GPP), ecosystem respiration (R-eco), and net ecosystem carbon exchange (NEE)) in four representative forest ecosystems in Yunnan. We found that 1) all four forest ecosystems were carbon sinks (the average NEE was -3.40 tC ha(-1) yr(-1)); 2) contrasting seasonality of the NEE among the ecosystems with a carbon sink mainly during the wet season in the Yuanjiang savanna ecosystem (YJ) but during the dry season in the Xishuangbanna tropical rainforest ecosystem (XSBN), besides an equivalent NEE uptake was observed during the wet/dry season in the Ailaoshan subtropical evergreen broad-leaved forest ecosystem(ALS) and Lijiang subalpine coniferous forest ecosystem(LJ); 3) as the GPP increased, the net ecosystem production (NEP) first increased and then decreased when the GPP > 17.5 tC ha(-1) yr(-1); 4) the precipitation determines the carbon sinks in the savanna ecosystem (e.g., YJ), while temperature did so in the tropical forest ecosystem (e.g., XSBN); 5) overall, under the circumstances of warming and decreased precipitation, the carbon sink might decrease in the YJ but maybe increase in the ALS and LJ, while future strength of the sink in the XSBN is somewhat uncertain. However, based on the redundancy analysis, the temperature and precipitation combined together explained 39.7%, 32.2%, 25.3%, and 29.6% of the variations in the NEE in the YJ, XSBN, ALS and LJ, respectively, which indicates that considerable changes in the NEE could not be explained by variations in the temperature and precipitation. Therefore, the effects of other factors (e.g., CO2 concentration, N/P deposition, aerosol and other variables) on the NEE still require extensive research and need to be considered seriously in carbon-cycle-models. (c) 2017 Published by Elsevier B.V.
关键词Carbon Fluxes Critical Factors Path Analysis Redundancy Analysis Climate Change Forest Ecosystems Eddy Covariance
作者单位1.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Key Lab Trop Forest Ecol, Menglun 666303, Yunnan, Peoples R China
2.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Global Change Ecol Grp, Menglun 666303, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Xishuangbanna Stn Trop Rainforest Ecosyst Studies, Xishuangbanna 666303, Yunnan, Peoples R China
5.Ailaoshan Stn Subtrop Forest Ecosyst Studies, Jingdong 676209, Yunnan, Peoples R China
6.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Yuanjiang Savanna Ecosyst Res Stn, Yuanjiang 653300, Yunnan, Peoples R China
7.Chinese Acad Sci, Kunming Inst Bot, Lijiang Forest Ecosyst Res Stn, 132 Lanhei Rd, Kunming 650201, Yunnan, Peoples R China
8.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Synth Res Ctr Chinese Ecosyst Res Network, Beijing 100101, Peoples R China
9.Yunnan Univ, Sch Ecol & Environm Sci, Inst Environm Sci & Ecol Restorat, Kunming 650091, Yunnan, Peoples R China
10.Univ Edinburgh, Sch GeoSci, Edinburgh EH9 3FF, Midlothian, Scotland
GB/T 7714
Fei, Xuehai,Song, Qinghai,Zhang, Yiping,et al. Carbon exchanges and their responses to temperature and precipitation in forest ecosystems in Yunnan, Southwest China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,616:824-840.
APA Fei, Xuehai.,Song, Qinghai.,Zhang, Yiping.,Liu, Yuntong.,Sha, Liqing.,...&Grace, John.(2018).Carbon exchanges and their responses to temperature and precipitation in forest ecosystems in Yunnan, Southwest China.SCIENCE OF THE TOTAL ENVIRONMENT,616,824-840.
MLA Fei, Xuehai,et al."Carbon exchanges and their responses to temperature and precipitation in forest ecosystems in Yunnan, Southwest China".SCIENCE OF THE TOTAL ENVIRONMENT 616(2018):824-840.
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