Abstract
Droughts have significantly damaged the environment of the Inner Mongolia Autonomous Region, China. In this study, the region was divided into two subregions. Soil moisture was used as the basic parameter to analyze the characteristics of agricultural droughts. Based on a geographical detector, the spatial stratified heterogeneity in different seasons was discussed. Moreover, the copula joint functions of characteristics and dominant factors of agricultural droughts were constructed. Based on the Soil Moisture Anomaly Percentage Index (SMAPI), the results demonstrate that the climate tendency rate of droughts in the summer and in spring in Subregion I shows an increasing trend, while it decreases in the autumn and winter. In Subregion II, the climate tendency rate of droughts in different seasons has no significant change. Through geographical detection, the single factor detection illustrates that temperature and Precipitation Conversion Efficiency (PCE) show the highest explanatory power in different subregions. The interactive detection also demonstrates the explanatory powers of the combination of the PCE and temperature, respectively. The t-copula function describes the correlation coefficients of the SMAPI with the PCE and temperature, with the optimal tail dependence. In short, agricultural droughts are most significantly affected by temperature and the PCE, and their balance has a significant impact on agricultural droughts.
Highlights
Drought is one of the most serious natural disasters that human beings encounter [1]
The changes in the trend of the standardized precipitation evapotranspiration index (SPEI) at 32 stations in the Inner Mongolia Autonomous Region were analyzed through Man-Kendall test. ∆ indicates that the test value is positive and shows an uptrend; ∇ indicates that the test value is negative and shows a downtrend
Based on the data of the soil moisture recorded in 32 meteorological stations in the Inner Mongolia Autonomous Region, the monthly Soil Moisture Anomaly Percentage Index (SMAPI) was calculated
Summary
Drought is one of the most serious natural disasters that human beings encounter [1]. In the context of global warming, the average amount of drought days in China is increasing overall, and the temperature in the Inner Mongolia Autonomous Region continues to increase. It is a prosperous agricultural region, the Inner Mongolia Autonomous Region suffers from drought, which is at the top of the list of disasters there, causing significant economic losses. In 2018, the area suffering from droughts in China spanned 7.7118 × 106 hectares, and it reached 1.427 × 106 hectares in the Inner Mongolia Autonomous Region alone, accounting for 18.50% of the affected area of the whole country [2]. By adopting agricultural droughts as main research objects, the effective evaluation of the characteristics of agricultural droughts and correlation analysis can be conducted; this is crucial for daily life and economic development
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