An observational study of the carbon-sink strength of East Asian subtropical evergreen forests
An observational study of the carbon-sink strength of East Asian subtropical evergreen forests
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DOI：
10.1088/1748-9326/7/4/044017
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发表时间：
2012-10
影响因子：
6.7
通讯作者：
Z. Tan;Yiping Zhang;N. Liang;Y. Hsia;Yong-Jiang Zhang;Guoyi Zhou;Yuelin Li;J. Juang;H. Chu;Junhua Yan;Guiping Yu;Xiao-Min Sun;Q. Song;K. Cao;D. Schaefer;Yu-hong Liu
中科院分区：
文献类型：
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作者：
Z. Tan;Yiping Zhang;N. Liang;Y. Hsia;Yong-Jiang Zhang;Guoyi Zhou;Yuelin Li;J. Juang;H. Chu;Junhua Yan;Guiping Yu;Xiao-Min Sun;Q. Song;K. Cao;D. Schaefer;Yu-hong Liu
相对而言，人们对区域变暖对亚热带万年青森林生态系统碳循环的影响知之甚少，其特点是全年生长季节和寒冷的冬季。采用涡动通量、土壤呼吸和叶片水平的观测方法，对东亚亚热带万年青林的碳平衡进行了研究。亚热带万年青森林即使在冬季寒冷时期也能保持持续的高光合活性。温暖的夏天以有限的方式提高光合速率，因为整个生态系统的生产力主要受到温暖时期辐射水平的限制。相反，温暖的气候显著增强呼吸碳流出。光合作用相对于呼吸作用的敏感性较低，说明温度升高会减弱东亚亚热带万年青林的碳汇强度。
Relatively little is known about the effects of regional warming on the carbon cycle of subtropical evergreen forest ecosystems, which are characterized by year-round growing season and cold winters. We investigated the carbon balance in three typical East Asia subtropical evergreen forests, using eddy flux, soil respiration and leaf-level measurements. Subtropical evergreen forests maintain continuous, high rates of photosynthetic activity, even during winter cold periods. Warm summers enhance photosynthetic rates in a limited way, because overall ecosystem productivity is primarily restrained by radiation levels during the warm period. Conversely, warm climates significantly enhance the respiratory carbon efflux. The finding of lower sensitivity of photosynthesis relative to that of respiration suggests that increased temperature will weaken the carbon-sink strength of East Asia subtropical evergreen forests.