Spatio-Temporal Distribution Characteristics and Driving Factors of Main Grain Crop Water Productivity in the Yellow River Basin.

For example, Mainuddin and Kirby analyzed the water productivity of the main crops in the lower reaches of the Mekong River Basin and showed that water productivity has significant spatial variability, and the water productivity of various crops displays an increasing trend [ 19 ].

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When | Z MK | > Z (1−α/2) , the null hypothesis is rejected, and there is a significant trend in the time series data.

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Z MK is the variation trend of time series data, which exhibits an increasing trend if Z MK is greater than zero and a decreasing trend if Z MK is less than zero.

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