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[1]FU Xiudong,YAN Junjie,Shawuli·Davuti,et al.Spatiotemporal Variation of Water Use Efficiency and Its Influencing Factors in the Grassland Ecosystem of Ili River Valley[J].Research of Soil and Water Conservation,2021,28(01):124-131.

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Spatiotemporal Variation of Water Use Efficiency and Its Influencing Factors in the Grassland Ecosystem of Ili River Valley

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 01 Page number: 124-131 Column: Public date: 2021-01-10

Title:: Spatiotemporal Variation of Water Use Efficiency and Its Influencing Factors in the Grassland Ecosystem of Ili River Valley

Author(s):: FU Xiudong, YAN Junjie, Shawuli·Davuti, LIU Haijun, CUI Dong, CHEN Chen; (Institute of Resources and Ecology, Yili Normal University, Yining, Xinjiang 835000, China)

Keywords:: water use efficiency; influencing factors; MODIS; grassland; Ili River Valley

CLC:: Q948.1

DOI:: -

Abstract:: Water use efficiency(WUE)is an important index indicating the coupling of carbon and water in the ecosystem. Study on the spatiotemporal variation of WUE in degraded grassland is of great significance for verifying the environmental effects of grassland degradation. Ili River Valley, labeled with serious grassland degradation, was selected as the study area. Based on data of MODIS NDVI(Normalized Difference Vegetation Index), GPP(Gross Primary Productivity), ET(Evapotranspiration)and meteorological factors, and with the help of GIS technology and the method of trend analysis, the spatiotemporal variation of WUE in the grassland ecosystem of Ili River Valley in 2000—2014 and its influencing factors were studied. The results showed that:(1)WUE, ET and GPP in the grassland of Ili River Valley all showed obvious differentiation along the altitude; areas with high WUE did not appear in arid desert area, but mainly distributed in area with high GPP(GPP>650 g C/m²)and relatively high ET(300～500 mm);(2)in the past 15 years, ET and GPP in the grassland of Ili River Valley decreased, while WUE increased; spatially, WUE increased in 79.20% of the grassland; the proportions of areas with decreased ET and GPP were 92.31% and 78.10%, respectively;(3)the increase of WUE in the study area was mainly due to the fact that the decrease of ET was higher than that of GPP; however, the change of ET was closely related to that of GPP; the change of WUE was not resulted from the single change in GPP or ET, but from the comprehensive interaction of changes in the both;(4)in the past 15 years, the decrease of precipitation in Ili River Valley was the main reason for the decrease of vegetation coverage, which affected the variations of WUE further. Variations of WUE in the grassland of Ili River Valley showed obvious regional characteristics. WUE increased by 6.61% on average within 15 years. The decrease of precipitation was the main climate factor that leaded to the increase of WUE in Ili River Valley.

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Last Update: 2021-01-15