Abstract
Drought is a worldwide concerned issue which causes huge losses in agriculture, economic and damages in natural ecosystems. The precise assessment of drought evolution characteristics is essential for agricultural water management and drought resistance, while such work is rarely reported. Thus, eight meteorological stations located within the Southwest Guizhou Autonomous Prefecture (SGAP) were selected, and the Standardized Precipitation Index (SPI) was used to assess the drought evolution characteristics. The results revealed that the drought occurrences number in Pu'an station was the largest (23 droughts), and the average drought duration in Xingren station was the longest (48.75 months). Moreover, the drought characteristics of the eight stations have account for the largest proportion under normal conditions, was more than 60%, the frequency of drought disaster occurring in Xingren is the highest (30.05%), followed by Wangmo (23.73%). The results of this study will provide theoretical guidance for drought resistance and agricultural production in Southwest Guizhou Autonomous Prefecture of China.
Highlights
The drought, which caused by climate periodic variation, is a major natural hazard to both human societies and ecosystems (Ashraf et al, 2015; Rahman et al, 2018)
In order to obtain the drought monitoring performance of the meteorological drought index in Southwest Guizhou Autonomous Prefecture (SGAP), the Standardized Precipitation Index (SPI) values at five different time scales (i.e. 1 month, 3 months, 6 months, 9 months, and 12 months) were calculated using the meteorological data of each stations, and the arithmetic mean of SPI were used as drought indicators in the eight stations of SGAP
The drought assessment capability of SPI was analyzed in the eight meteorological stations (Anlong, Ceheng, Pu'an, Qinglong, Wangmo, Xingren, Xingyi, and Zhenfeng)
Summary
The drought, which caused by climate periodic variation, is a major natural hazard to both human societies and ecosystems (Ashraf et al, 2015; Rahman et al, 2018). According to the previous studies, the amount of precipitation and the duration of drought period are the main factors of the drought, and drought mainly results from the deficiency of precipitation, which needs further water supplement for alleviating the water shortage in agricultural productions (Rahman et al, 2018). It should take into account the timing (i.e., the principal season of occurrence, delays in the start of the rainy season) and the effectiveness (i.e., precipitation intensity, number of precipitation events) of the rains (Pai et al, 2011). The above analysis could elucidate the evolution characteristics of drought change, and provide theoretical guidance for drought resistance and agricultural production in SGAP of China
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