Water availability is more important than temperature in driving the carbon fluxes of an alpine meadow on the Tibetan Plateau
Water availability is more important than temperature in driving the carbon fluxes of an alpine meadow on the Tibetan Plateau
复制标题
在驱动青藏高原高寒草甸的碳通量方面，水资源的可用性比温度更重要
DOI：
10.1016/j.agrformet.2018.02.027
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发表时间：
2018-06
影响因子：
6.2
通讯作者：
Guirui Yu
中科院分区：
文献类型：
--
作者：
Tao Zhang;Yangjian Zhang;Mingjie Xu;Juntao Zhu;Ning Chen;Yanbin Jiang;Ke Huang;Jiaxing Zu;Yaojie Liu;Guirui Yu
温度是影响青藏高原高寒草甸碳通量的主导因子，而水分的贡献具有较大的不确定性。利用涡度相关（EC）资料，研究了温度和水分对高寒草甸生态系统碳通量的相对贡献。结果表明，土壤水分含量是影响净生态系统生产力（NEP）、总初级生产力（GPP）和生态系统响应（Re）的最重要因子。在任何温度条件下，GPP和Re都随着SWC的增加而增加，表明水分有效性对碳通量的主导控制作用。水分有效性调节了生态系统对温度的响应大小，可以缓解低温胁迫。高山植物中午的光合能力受水分胁迫的抑制，而不是高温。结构方程模型（SEM）分析进一步证实了SWC对碳通量的主导作用。研究结果表明，气候变化对高寒草甸生态系统的影响可能更多地是由水分格局的变化引起的，而不是由温度的升高引起的，这为高寒草甸碳通量的气候控制提供了新的认识，也加深了人们对气候变化对青藏高原碳循环影响的认识。
Temperature is conventionally considered as the dominant factor regulating carbon fluxes of the alpine meadow on the Tibetan Plateau, while contribution from water availability is composed of large uncertainty. In this study, eddy covariance (EC) data were used to assess the relative contribution of temperature and water availability to carbon fluxes of the alpine meadow ecosystem. The results showed that soil water content (SWC) was the most important factor controlling carbon fluxes – Net Ecosystem Productivity (NEP), Gross Primary Productivity (GPP) and Ecosystem Respiration (Re). The GPP and Re increased with strengthened SWC under any temperature conditions, indicating the dominant control of water availability on carbon fluxes. In addition, water availability regulated the response size of ecosystem to temperature, and could alleviate the stress caused by low temperature. The photosynthesis capacity of alpine plants at noon was depressed by water stress rather than by high temperature. The structural equation modeling (SEM) analysis further confirmed the dominance of SWC on the carbon fluxes. This study implies that effects of climatic change on this alpine ecosystem might be more induced by changes in water pattern than increased temperature, which provides new insights into the climate controls of carbon fluxes over alpine meadow, and adds to our understanding on climate change impacts on carbon cycling on the Tibetan Plateau.
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影响因子：
2.7
作者：
Tao Zhang;Mingjie Xu;Y. Xi;Juntao Zhu;Li Tian;Xian-zhou Zhang;Yanfen Wang;Ying-nian Li;
通讯作者：
Tao Zhang;Mingjie Xu;Y. Xi;Juntao Zhu;Li Tian;Xian-zhou Zhang;Yanfen Wang;Ying-nian Li;
影响因子：
4.9
作者：
C. Schwalm;C. Williams;K. Schaefer;I. Baker;G. Collatz;C. Rödenbeck
通讯作者：
C. Schwalm;C. Williams;K. Schaefer;I. Baker;G. Collatz;C. Rödenbeck
影响因子：
6.2
作者：
X. Wen;Guirui Yu;Xiaomin Sun;Qingkang Li;Yunfen Liu;Leiming Zhang;C. Ren;Yu-ling Fu;Zheng-Quan Li
通讯作者：
X. Wen;Guirui Yu;Xiaomin Sun;Qingkang Li;Yunfen Liu;Leiming Zhang;C. Ren;Yu-ling Fu;Zheng-Quan Li
影响因子：
5.7
作者：
Xu Shixiao;Zhao Xinquan;Fu Yuling;Zhao Liang;Li Yingnian;Cao Guang-min;Gu Song;W. Qinxue;Mingyuan Du
通讯作者：
Xu Shixiao;Zhao Xinquan;Fu Yuling;Zhao Liang;Li Yingnian;Cao Guang-min;Gu Song;W. Qinxue;Mingyuan Du
DOI：
10.1007/s11430-006-8001-3
发表时间：
2006-11
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
Guirui Yu;Yu-ling Fu;Xiaomin Sun;X. Wen;Leiming Zhang
通讯作者：
Guirui Yu;Yu-ling Fu;Xiaomin Sun;X. Wen;Leiming Zhang