Additionally, the variation trend of scPDSI is divided into four types: extremely significant increase, significant increase, significant decrease, and extremely significant decrease.
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Assessing the Impacts of Drought on Grassland Net Primary Production at the Global Scale.
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The sentences
The results showed that the global grassland scPDSI value had a slightly increasing trend with the rate of 0.0119 per year (R 2 = 0.195), indicating that the global grassland drought lighter to some extent during study period.
The UF(k) showed a decreasing trend during 1982–1988, and an increasing trend from 1989 to 1991, and then a downward trend during 1992–1997, and an increasing trend after 1998.