Spatiotemporal Variation in Actual Evapotranspiration and the Influencing Factors in Ningxia from 2001 to 2020.

Based on a confidence level of 0.05, the Mann-Kendall test results were divided into nine grades: extremely significant increase, significant increase, slight increase, insignificant increase, no change, insignificant decrease, slight decrease, significant decrease and extremely significant decrease.

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ET showed an increasing trend in the most regions of Ningxia, accounting for 96.58% of the total area ( Table 1 and Figure 6 ).

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