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Evaluating the potentials of cropping adjustment for groundwater conservation and food production in the piedmont region of the North China Plain

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Abstract

Of all economic activities in the North China Plain, agriculture accounts for the highest consumption of water resources. As water saving by using technologies to alleviate groundwater depletion has its limitations, adjusting the cultivation patterns of water-intensive crops becomes an unavoidable measure to ensure water sustainability. Different cropping patterns (including fallowing) and water supply scenarios were set up, using the DSSAT crop model and a regression model, in order to predict the effects of cropping adjustments on groundwater sustainability and food production in the piedmont region of the plain. The results indicate that: (1) irrigation water requirement needs to be limited to a maximum level of 187 mm/a to sustain groundwater at the present level. Above this level, every 100 mm of irrigation pumping leads to a decline of 0.49 m in the groundwater level; (2) under the current water supply conditions, and taking groundwater sustainability, food supply, water use efficiency and soil fertility recovery into consideration, leaving 34% of the cropland fallow or leaving it fallow every 3 years seems to be the best option; (3) If an extra amount of water of 0.2 or 0.5 billion m3 is supplied as a result of the SNWT Project, the percentage of cropland which should be left fallow can decrease to 25% or 11% respectively. The comprehensive information on the water and food nexus derived from this study can provide a reference framework for policies concerning sustainable water use and food security in the region.

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Acknowledgement

This work was supported by the Major Science and Technology Program for Water Pollution Control and Treatment (2018ZX07110001),  the Natural Science Foundation of China (grant no. 41671021), and the National Key Research and Development Program of China (No. 2017YFD0300908). Dandan Ren was supported by the funding from the China Scholarship Coucil (CSC.201804910607).

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Correspondence to Yonghui Yang.

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Ren, D., Yang, Y., Hu, Y. et al. Evaluating the potentials of cropping adjustment for groundwater conservation and food production in the piedmont region of the North China Plain. Stoch Environ Res Risk Assess 35, 117–128 (2021). https://doi.org/10.1007/s00477-019-01713-y

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  • DOI: https://doi.org/10.1007/s00477-019-01713-y

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