Analysis of drought evolution characteristics in Anhui province from 1961 to 2019 based on SPI

doi:10.14088/j.cnki.issn0439-8114.2022.06.010

Abstract

Abstract: In order to analyze the applicability of standardized precipitation index（SPI） in drought monitoring and evaluation in Anhui province, the temporal and spatial evolution characteristics of drought in 1961—2019 were analyzed based on SPI from three aspects： Drought frequency, station to station ratio and drought intensity. The results showed that the drought frequency in all regions of Anhui province was generally higher in the south than in the north, and the average frequency of light drought, medium drought and heavy drought was 31.7%, 15.7% and 6.1%, respectively; Since 1961, the average station to station ratio of light drought in Anhui province had been as high as 31.7%. There had been 15 years of global drought. 1978 was the year with the widest drought area, with 18 times of global spring drought, 14 times of global summer drought, 17 times of global autumn drought and 16 times of global winter drought; Since 1961, the drought in Anhui province had been mainly from light drought to medium drought, with a weak downward trend and the strongest year. The drought intensity of each season was summer drought > autumn drought, spring drought > winter drought in 1978. Spring drought in 2011, summer drought in 1978, autumn drought in 2019 and winter drought in 1968 were the strongest years of each season drought since 1961. SPI can be used to evaluate the drought in Anhui province.

Key words: standardized precipitation index（SPI）, drought, spatiotemporal change, Anhui province

CLC Number:

S423

XIONG Shi-wei, QIU Yang-yang, YU Ling-hua, JIANG Lin, HUA Jun-wei, LING Zun-bin. Analysis of drought evolution characteristics in Anhui province from 1961 to 2019 based on SPI[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(6): 56-60.

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