Based on meteorological data from 1961 to 2020 in Changji,the interannual and decadal variation characteristics of the standardized precipitation index(SPI-7)were analyzed,to reveal the frequency and intensity of drought occurrence during the crop growth season.The results show that,the water content showed an increasing trend from 1961 to 2020,with a standardized precipitation index increasing at a rate of 0.08/10 a.The meteorological drought showed an inter-decadal trend of dry-wet-dry,with a sudden change occurring in 1981.The intensity of drought was increasing,and the area of drought occurrence was weakly decreasing.There was a high incidence area of drought in the eastern region,and mainly characterized by mild drought.The western region was a high incidence area of moderate drought,severe drought,and extreme drought.The meteorological drought had periodic oscillations of 6,9,and 16 years in Changji,which was in good agreement with historical disasters.The research results provide a basis for crop drought monitoring and warning in Changji.
关键词
作物生长季/气象干旱/标准化降水指数(SPI)/干旱强度/干旱频率
Key words
crop growth season/meteorological drought/standardized precipitation index(SPI)/drought intensity/drought frequency
万方数据