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Seasonal dynamics of water use efficiency of typical forest and grassland ecosystems in China |
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| Authors: | Xianjin Zhu Guirui Yu Qiufeng Wang Zhongmin Hu Shijie Han Junhua Yan Yanfen Wang Liang Zhao |
| Institution: | 1. Synthesis Research Center of CERN, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A, Datun Road, Chaoyang, Beijing, 100101, China 2. University of Chinese Academy of Sciences, Beijing, 100049, China 3. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China 4. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China 5. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810001, China |
| Abstract: | We selected four sites of ChinaFLUX representing four major ecosystem types in China—Changbaishan temperate broad-leaved Korean pine mixed forest (CBS), Dinghushan subtropical evergreen broadleaved forest (DHS), Inner Mongolia temperate steppe (NM), and Haibei alpine shrub-meadow (HBGC)—to study the seasonal dynamics of ecosystem water use efficiency (WUE = GPP/ET, where GPP is gross primary productivity and ET is evapotranspiration) and factors affecting it. Our seasonal dynamics results indicated single-peak variation of WUE in CBS, NM, and HBGC, which were affected by air temperature (Ta) and leaf area index (LAI), through their effects on the partitioning of evapotranspiration (ET) into transpiration (T) (i.e., T/ET). In DHS, WUE was higher at the beginning and the end of the year, and minimum in summer. Ta and soil water content affected the seasonal dynamics of WUE through their effects on GPP/T. Our results indicate that seasonal dynamics of WUE were different because factors affecting the seasonal dynamics and their mechanism were different among the key ecosystems. |
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