Characterization and Evaluation of MODIS-Derived Crop Water Stress Index (CWSI) for Monitoring Drought from 2001 to 2017 over Inner Mongolia

Zi-Ce Ma, Peng Sun, Qiang Zhang, Yu-Qian Hu and Wei Jiang
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Zi-Ce Ma: School of Geography and Tourism, Anhui Normal University, Wuhu 241002, China
Peng Sun: School of Geography and Tourism, Anhui Normal University, Wuhu 241002, China
Qiang Zhang: State Key Laboratory of Surface Process and Resource Ecology, Beijing Normal University, Beijing 100875, China
Yu-Qian Hu: School of Geography and Tourism, Anhui Normal University, Wuhu 241002, China
Wei Jiang: School of Geography and Tourism, Anhui Normal University, Wuhu 241002, China

Sustainability, 2021, vol. 13, issue 2, 1-17

Abstract: Inner Mongolia is one of the main green production bases of agricultural and animal husbandry products. Due to factors such as natural geographical location, drought occurs frequently in Inner Mongolia. Based on the MOD16 product and the method of crop water stress index (CWSI) combined with multi-year precipitation and temperature data, the spatial and temporal distribution characteristics and major influencing factors of drought in Inner Mongolia from 2001 to 2017 were analyzed. In order to provide effective scientific basis for drought control and drought resistance in Inner Mongolia for decision. The results showed that: (1) during 2001–2017, the average annual CWSI in Inner Mongolia had a strong spatial heterogeneity, which showed a trend of gradual increase from northeast to southwest. The annual average CWSI was 0.7787 and showed a fluctuating downward trend for Inner Mongolia. (2) The CWSI of every 8d during one year in Inner Mongolia showed the double-peak trend, reaching its maximum of 0.9043 in the 121st day. In addition, the average CWSI of every 8d was 0.6749. (3) In Inner Mongolia, the average CWSI of different land-use types showed little difference and ranged from small to large: woodland (0.5954) < cropland (0.7733) < built-up land (0.8126) < grassland (0.8147) < unused land (0.8392). (4) The average correlation coefficients between CWSI and precipitation, temperature respectively were −0.53 and 0.18, which indicated that CWSI was highly correlated with precipitation in Inner Mongolia.

Keywords: drought; CWSI; land-use; temperature; precipitation; Inner Mongolia (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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