Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (3): 385-395.doi: 10.11821/xb201103011

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Estimation of Actual Evapotranspiration and Its Component in the Upstream of Jinghe Basin

ZHANG Shulan1, YU Pengtao1, WANG Yanhui1, ZHANG Haijun2, Valentina Krysanova3, HUANG Shaochun3, XIONGWei1, XU Lihong1   

  1. 1. The Research Institute of Forestry Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    2. College of Life Science, Jiamusi University, Heilongjiang, Jiamusi 154007, Heilongjiang, China;
    3. Potsdam Institute for Climate Impact Research, P.O.Box 601 203, Telegrafenberg, D-14412, Potsdam, Germany
  • Received:2010-11-15 Revised:2010-12-21 Online:2011-03-20 Published:2011-03-20
  • Supported by:

    National Natural Science Foundation, No.40730631; No.41071023; Forestry Industry Research Special Funds for Public Welfare Projects, No.200904056; No.200904005; Special Funds Projects for Basic Scientific Research Business Expenses of Central Public Welfare Research Institutes in Chinese Academy of Forestry, No.CAFYBB2007038; No. CAFYBB2010001-02; The Forest Orientation Station for Liupan Mountain State of Forestry Administration and Forest Ecological Environment Key Open Lab Funding

Abstract: The ecohydrological model SWIM was used to simulate the hydrological process based on the data of vegetation, soil, climate, hydrology in the upstream of Jinghe River located at the Jingchuan station, and actual evapotranspiration and its components were estimated. The result showed that SWIM model was applicable to this area, and the average annual actual evapotranspiration (AET) was 443 mm from 1997 to 2003 in the watershed, with soil evaporation being 259 mm, vegetation transpiration 157 mm, and canopy interception 27 mm. In the watershed, the AET of the forest and non-forest area in rocky mountain was 484 mm in maximum and 418 mm in minimum respectively. And the AET of loess area was 447 mm lower than that of forest area and higher than that of non-forest area in rocky mountain. In addition, soil evaporation in forest area was significantly low, while the transpiration and canopy interception in the area were obviously high in the watershed. The inter-annual AET mainly occurred in the period from May to August, which was 60% of the total annual AET, with the great proportion 63% of canopy evapotanspiration. The AET of wet year increased by 78 mm compared with that of dry year, among which, soil evaporation increased greatest, followed by transpiration and canopy interception.

Key words: SWIM model, actual evapotranspiration, spatio-temporal pattern, Jinghe River, Gansu