| This work estimates the evapotzation of Jinghe watershed basin by using the SEBAL model with the remote sensing image data from 1998, 2007 and 2011. Morlet wavelet analysis and M-K mutation test were used to study the temporal spatial pattern, variation characteristics and periodicity of actual evapotranspiration rate. Results showed: ①From 1998 to 2011, actual daily evapotranspiration in the study area dropped from 4.90 mm to 4.46 mm, showing a general downward trend; ②Actual daily evapotranspiration in the central part of the study area AiBi Lake was extremely high, which ranged from 7.3 to 9.32 mm. Actuall daily evapotranspiration rate in Northwest, North and East were low, which ranged from 0.53 to 1.27 mm; ③Among different land types in the study area, unused land had the lowest daily evapotranspiration rate, followed by residential land. Woodland and cultivated land had the highest daily evapotranspiration rate except water; ④Daily evapotranspiration rate had a 26~30 a cyclic variation law, with the prediction that the evapotranspiration would decline again from 2022 and would enter into the rising cycle in 2030 once again. |