| Simulation on spatio\|temporal stability of ET based on MOD16A2 in Mu Us sandy land |
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| DOI：10.7606/j.issn.1000-7601.2020.02.34 |
| Key Words: evapotranspiration MOD16A2 spatial and temporal distribution characteristics space\|time stability Mu Us sandy land |
| Author Name | Affiliation | | LIU Jing | Institute of Water Resources for Pastoral Area of the Ministry of Water Resourcesof China, Hohhot, Inner Mongolia 010020, China | | LIU Tiejun | Institute of Water Resources for Pastoral Area of the Ministry of Water Resourcesof China, Hohhot, Inner Mongolia 010020, China | | DU Xiaofeng | Institute of Water Resources for Pastoral Area of the Ministry of Water Resourcesof China, Hohhot, Inner Mongolia 010020, China | | WU Yongsheng | Institute of Water Resources for Pastoral Area of the Ministry of Water Resourcesof China, Hohhot, Inner Mongolia 010020, China | | BAO Yulong | Inner Mongolian Normal University, Hohhot, Inner Mongolia 010020, China |
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| Abstract: |
| This paper used MOD16A2 remote sensing data to analyze the mean value of evapotranspiration (ET) at different years and months of 2000-2014 in the Mu Us sandy land, in order to discuss the distribution characteristics and variation tendency of ET in different time\|space scales. The results showed that, the temporal distribution of ET in the Mu Us sandy land had significant zonality and seasonality variation characteristics. ET had a decreasing trend in winter and spring, which was dropping by the rate of 53.24% at first, on the contrary, ET increased first and then decreased in the summer and autumn. The lowest mean value of ET in April was less than 10 mm and the others peaks appeared in September and December that mean values were 20 mm and 25 mm. The annual average of ET in the southeast was higher than that in the northwest, which changed from 17.5 to 22.5 mm. For the past 15 years, the order of fluctuating area was: mild (33.67%) > morderate (32.04%) > severe (18.46%) > slight (15.83%). ET fluctuated strongly in the southwest, then slowly in the northeast and steadily in the middle of Mu Us sandy land. During the past 15 years, the ET increased by 34.38%, decreased by 28.49%, and remained unchanged by 28.13%. Mu Us sandy land showed that the increasing trend was rapider than the decreasing trend. Meanwhile, it indicated that the climate of this area improved and the drought was reduced. The results illustrated that MOD16A2 product was applicable for the analysis of Mu Us sandy land distribution characteristic of ET, which were satisfied the requirement of spatial and temporal variation analysis. |
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