Fig. 5: Contribution of the depth of water requirement and rice area to the volumetric blue water requirement of rice cultivation during the two periods of 2000–2017, and 2017–2020. | Communications Earth & Environment

Fig. 5: Contribution of the depth of water requirement and rice area to the volumetric blue water requirement of rice cultivation during the two periods of 2000–2017, and 2017–2020.

From: Climate adaptation through rice northward expansion aggravated groundwater overexploitation in Northeast China

Fig. 5

a The trends of volumetric blue water requirement change of rice from 2000 to 2020 using a piecewise regression model with one turning point. Slope1 and slope2 are the slopes before and after the turning point, respectively. ** means the trends are significant at the level of 0.01. b The relative contribution of depth changes of total water requirement (TWR), green water requirement (GWR), and rice area to the volumetric blue water requirement changes during two periods based on the Logarithmic Mean Divisia Index. Grey boxes show the volumetric blue water requirement of rice cultivation in 2000, 2017, and 2020. Red rectangles represent the direct contributions of climate change and also indicate depth changes of blue water requirement.

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