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Journal of Geographical Sciences

, Volume 26, Issue 10, pp 1391–1411 | Cite as

Spatial variation in annual actual evapotranspiration of terrestrial ecosystems in China: Results from eddy covariance measurements

  • Han Zheng
  • Guirui Yu
  • Qiufeng Wang
  • Xianjin Zhu
  • Honglin He
  • Yanfen Wang
  • Junhui Zhang
  • Yingnian Li
  • Liang Zhao
  • Fenghua Zhao
  • Peili Shi
  • Huimin Wang
  • Junhua Yan
  • Yiping Zhang
Article

Abstract

Understanding the spatial variation in annual actual evapotranspiration (AET) and its influencing factors is crucial for a better understanding of hydrological processes and water resources management. By synthesizing ecosystem-level observations of eddy-covariance flux sites in China (a total of 61 sites), we constructed the most complete AET dataset in China up to now. Based on this dataset, we quantified the statistic characteristics of AET and water budgets (defined as the ratio of AET to annual mean precipitation (MAP), AET/MAP) of terrestrial ecosystems in China. Results showed that AET differed significantly among both different vegetation types and climate types in China, with overall mean AET of 534.7±232.8 mm yr-1. AET/MAP also differed significantly among different climate types, but there were no distinct differences in AET/MAP values across vegetation types, with mean AET/MAP of 0.82±0.28 for non-irrigated ecosystems. We further investigated how the main climatic factors and vegetation attributes control the spatial variation in AET. Our findings revealed that the spatial variation of AET in China was closely correlated with the geographical patterns of climate and vegetation, in which the effects of total annual net radiation (R n), MAP and mean annual air temperature (MAT) were dominant. Thus, we proposed an empirical equation to describe the spatial patterns of AET in China, which could explain about 84% of the spatial variation in AET of terrestrial ecosystems in China. Based on the constructed dataset, we also evaluated the uncertainties of five published global evapotranspiration products in simulating site-specific AET in China. Results showed that large biases in site-specific AET values existed for all five global evapotranspiration products, which indicated that it is necessary to involve more observation data of China in their parameterization or validation, while our AET dataset would provide a data source for it.

Keywords

evapotranspiration water budget spatial variation eddy covariance terrestrial ecosystem China-FLUX 

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Copyright information

© Institute of Geographic Science and Natural Resources Research (IGSNRR), Science China Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Han Zheng
    • 1
    • 2
    • 3
  • Guirui Yu
    • 1
  • Qiufeng Wang
    • 1
  • Xianjin Zhu
    • 1
  • Honglin He
    • 1
  • Yanfen Wang
    • 3
  • Junhui Zhang
    • 4
  • Yingnian Li
    • 5
  • Liang Zhao
    • 5
  • Fenghua Zhao
    • 1
  • Peili Shi
    • 1
  • Huimin Wang
    • 1
  • Junhua Yan
    • 6
  • Yiping Zhang
    • 7
  1. 1.Synthesis Research Center of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchCASBeijingChina
  2. 2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth EnvironmentCASXi’anChina
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.Institute of Applied EcologyCASShenyangChina
  5. 5.Northwest Institute of Plateau BiologyCASXiningChina
  6. 6.South China Botanical GardenCASGuangzhouChina
  7. 7.Key Lab of Tropical Forest Ecology, Xishuangbanna Tropical Botanical GardenCASMenglunYunnan, China

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