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.
Highlights
In order to ensure the accuracy of crop water stress index (CWSI) drought monitoring results in this study area, the CWSI calculated based on MOD16 products was tested
The results showed that relative soil moisture at 20 cm can effectively reflect the accuracy of CWSI drought detection
The results showed that the correlation coefficient between CWSI and relative soil moisture at 20 cm is −0.86, which indicated that the CWSI calculated by MOD16 has good validation accuracy and applicability in Inner Mongolia and can be used for drought monitoring in this area
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Drought is a recurring natural disaster that frequently occurs and lasts for a long time and has an important impact on economic development and ecological environment construction, especially on agricultural production [1,2]. Drought is generally divided into four types: meteorological drought, agricultural drought, hydrological drought and socio-economic drought [3]. The main research fields are meteorological drought and agricultural drought but agricultural drought is more complex. Monthly and annual weather and climate disturbances in agricultural region have a significant impact on local and regional scales [4]
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