| Cite this article: | 张雪靓,丁蓓蓓.冬小麦“春浇一水”限水灌溉模式可否实现浅层地下水采补平衡——以河北省太行山山前平原为例[J].灌溉排水学报,,():-. |
| ZHANG Xueliang,DING Beibei.冬小麦“春浇一水”限水灌溉模式可否实现浅层地下水采补平衡——以河北省太行山山前平原为例[J].灌溉排水学报,,():-. |
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| Could the limited irrigation scheme for winter wheat with once time at the jointing stage achieve shallow groundwater equilibrium?-- A simulation of Taihang Mountain piedmont plain in Hebei Province |
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ZHANG Xueliang, DING Beibei
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China Agricultural University
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| Abstract: |
| 【Objective】In the piedmont plain of Mount Taihang in Hebei Province, a well-irrigated region that is facing a dilemma between water resources capacity and crop production, the limited irrigation scheme for winter wheat with once time might be a practical alternative strategy to conserve the depleting groundwater. 【Method】In this study, we designed eight kinds of scenarios with different irrigation quotas under this limited irrigation scheme to conduct simulation using a modified SWAT model. Based on the estimated results of shallow groundwater drawdown mitigation and agricultural water saving effects, an optimization using a 0-1 linear programming was conducted at each of the 22 subbasins. Specifically, the constraint condition was set as stopping the decline of shallow groundwater table, and the objective function was set as minimizing the reduction in winter wheat yield. 【Result】①Under the limited irrigation scheme for winter wheat with once time at the jointing stage, the declining rate of shallow groundwater table in the study area would be restrained to less than 0.34 m/a on average; the amounts of shallow groundwater overexploitation for well-irrigation would be reduced by over 70% in comparison with the current situation. However, the winter wheat yield would decrease by 25%~40% averagely. ②In terms of the spatial distribution, the Daqing River Dianxi Plain in the northern part of the study area had a more satisfactory groundwater conservation effects; whereas, in the Ziya River Plain, which is located at the southern part, a higher averaged winter wheat yield performed. ③Under these optimized irrigation schemes pattern, for most counties of Baoding area, an irrigation quota of 50 mm was mainly recommended; for the counties of Xingtai and Handan areas, an irrigation quota of 40 mm was mainly recommended; for the southwest of Shijiazhuang area, the scheme with an irrigation quota of 30 mm was mainly recommended. 【Conclusion】The optimized results showed that approximately 70% of the study area could achieve shallow groundwater equilibrium under the recommended irrigation schemes pattern. These results could provide quantitative references for the implementation of an operable limited irrigation scheme (i.e., applying one round of irrigation at the jointing stage for winter wheat) in this well-irrigated area where the shallow groundwater is overdrawn. |
| Key words: Limited irrigation scheme; Shallow groundwater; Groundwater equilibrium; Crop yield; SWAT model; Optimization |
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