RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (Z1): 9-16.doi: 10.11870/cjlyzyyhj2016Z1002

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SPATIOTEMPORAL VARIATION OF TERRESTRIAL EVAPOTRANSPIRATION IN POYANG LAKE WATERSHED FROM 2001 TO 2013

ZHU Jing-xuan1,2, QI Shu-hua1,2,3, LIU Gui-hua1,3, WANG Dian2, XIONG Meng-ya2   

  1. 1. Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China;
    2. School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China;
    3. Jiangxi Provincial Key Laboratory of Poyang Lake Comprehensive Management and Resources Exploitation, Nanchang 330022, China
  • Received:2015-07-23 Revised:2015-09-28 Online:2016-11-26
  • Supported by:
    National Natural Science Fundation of China,(41261069);Collaborative Innovation Center for Major Ecological Security Issues of Jiangxi Province and Monitoring Implementation,(JXS-EW-00);Key project from Educational Department of Jiangxi province(14241)

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Abstract: Evapotranspiration (ET) is an important process of water cycle over land surfaces. ET is also a crucial parameter in the fields of water resources, water recycling and other fields. In this paper, water discharge from five main tributaries and precipitation from 80 meteorological stations in Poyang Lake watershed were used to verify the MODIS evapotranspiration data products (ETMOD) during 2000-2013 according to the principle of water balance. The spatiotemporal pattern of ET in the Poyang watershed was analyzed. The results showed that (1) the sum of ETMOD and water discharge is closed to precipitation for every sub-watershed in the Poyang Watershed. The average absolute error of annual ET was about 166 mm, the average relative error was about 10%. It means that ETMOD can be used reliably. (2) In addition to water bodies and building land, the annual ET changed from 875.4 mm to 912.2 mm during 2000-2013. The ascent happened in 2003, 2012 and 2013, which exceeded the average ET value by 21.36 mm, 16.93 mm and 14.86 mm respectively. The seasonal variation characteristics of the ET in the Poyang watershed increased during spring to summer and then deceased during autumn to winter. (3) The annual ET is lower for the alluvial plain around the Poyang Lake and higher for the mountainous region that is mainly covered by forest. ET was higher in the Ganjiang sub-watershed than the others, which was attributed to the high forest cover. (4) ET is affected by land use significantly, the average ET for every land use type was ordered as woodland > farmland > grassland > unused land.

Key words: evapotranspiration, MODIS product, Poyang Lake watershed

CLC Number: 

  • P426.2
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