Studying the changes of evapotranspiration of degraded grassland in Inner Mongolia is conducive to understanding the water cycle of the degraded grassland ecosystem in this region and provides an important basis for the rational use of grassland water resources in this region. In this study, Duolun County in Inner Mongolia was taken as the research object. MODIS data during the flourishing period from 2001 to 2017 were used to invert the spatial distribution and variation of vegetation coverage and daily evapotranspiration in this region for nearly 17 years, and the effects of land use and grassland degradation on evapotranspiration were analyzed. Some conclusions have been reached: ① The order of vegetation coverage of different land use types is forest land >farmland>residential construction land>grassland>unused land>water area; the order of daily evapotranspiration of different land use types is water area>forest land>farmland >residential construction land>grassland>unused land. ② From 2001 to 2017, the grassland types in Duolun County are mainly of the III and IV grades; the area of low-grade grassland has a downward trend, while the area of high-quality grassland has an upward trend, which indicates that the protective measures for grassland in this area achieved certain results. ③ During 2001-2017, there was no obvious change trend in the daily evapotranspiration of all grassland grades; except for a few years, vegetation coverage and daily evapotranspiration showed consistent interannual fluctuations. ④ According to the spatial and temporal distribution pattern of vegetation coverage and daily evapotranspiration, it is concluded that there is a positive correlation between vegetation coverage and daily evapotranspiration.
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