Spatiotemporal drought analysis by the standardized precipitation index (SPI) and standardized precipitation evapotranspiration index (SPEI) in Sichuan Province, China.

In the period 1971–1980s, the drought trend in the all area gradually alleviated, and only 29.5% of the sites showed a negative trend, which was not significant ( P > 0.05), the magnitude of trend varied between − 2.2 to 2.0 year −1 .

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