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[1]YAN Junjie,FU Xiudong,ZHAO Yu,et al.Spatiotemporal Variation of Evapotranspiration in the Grassland of Yili Valley from 2001 to 2015[J].Research of Soil and Water Conservation,2019,26(06):184-190,197.

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Spatiotemporal Variation of Evapotranspiration in the Grassland of Yili Valley from 2001 to 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 184-190,197 Column: Public date: 2019-10-17

Title:: Spatiotemporal Variation of Evapotranspiration in the Grassland of Yili Valley from 2001 to 2015

Author(s):: YAN Junjie^1,2,3,4, FU Xiudong⁴, ZHAO Yu⁴, LIU Ying⁴, Lü Guanghui¹, CUI Dong⁴, LIU Haijun⁴; 1. College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China;
2. Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Yili Normal University, Yining, Xinjiang 835000, China

Keywords:: actual evapotranspiration; MOD16; spatiotemporal variation; Yili Valley

CLC:: Q948.15

DOI:: -

Abstract:: Evapotranspiration (ET) is an important way of environmental regulation in terrestrial ecosystems. Under the background of grassland degradation, study on the spatiotemporal changes of grassland ET is of great importance for grasping the ecological effects of grassland degradation. Based on remote sensing data of MODIS ET and NDVI and station data of temperature and precipitation, and using technologies and methods of spatial analysis of GSI, inversion of grassland coverage, interpolation of temperature and precipitation and calculation of difference and correlation, we chose the Yili Valley, featured with serious grassland degradation, as the study area, and analyzed and discussed the spatiotemporal variation of grassland ET from 2001 to 2015 and its influencing factors. The results showed that:(1) the annual average ET of grassland in Yili Valley was 395.74 mm, and ET of the 43.21% grassland was 400~500 mm; ET showed obvious spatial differentiation along elevation, and the spatial differentiation was consistent with the spatial differentiation of coverage; (2) in the past 15 years, ET in grassland of Yili Valley had decreased by 11.06% in total; spatially, 98.07% of the grassland ET decreased at various degrees, among which ET of 51.82% of the total grassland decreased by 10%~20%, and mainly located in the flood plain and low mountain areas; (3) during the period of 2011-2015, the spatial differentiation of the ET change altered obviously, the proportion of ET reduction in low altitude areas decreased while that in high altitude areas increased; (4) the correlation between vegetation coverage and ET was the highest in Yili Valley; coverage was the key factor to determine the spatial distribution and temporal change of grassland ET. The effect of precipitation on the spatial distribution and change of grassland ET was higher than that of air temperature. The decrease of vegetation coverage, precipitation and temperature in the Yili Valley constituted the driving factors for the decrease of grassland ET in together. However, the complex terrain made the correlation between grassland ET and its influencing factors present obvious and diverse spatial differences.

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