CPSP模型在华北井灌区农业水管理中的应用

为研究不同农业水管理措施对区域水平衡的影响,选择北京市大兴区为华北井灌区代表性研究区,以CPsP模型为技术支持,研究了提高灌溉水利用率、采用亏缺灌溉、改善农业种植结构及利用区外水源等不同水管理措施影响下区域水平衡、区域耗水、区域取水及用水指标的变化规律.结果表明,在资源型缺水区域,提高灌溉水利用率、采用非充分灌溉及改善农业种植结构在一定程度上能缓解区域水资源紧缺的压力,特别是采用非充分灌溉及改善作物种植结构能显著减少区域取水及耗水总量,并能减少地表水及地下水的补给量中回归水所占比例,在缓解区域水资源紧缺压力的同时也降低了区域水质遭受回归水污染风险.另外,在未来情景中,因经济快速发展及人口持续增长,工业及居民生活用水量增加,区域水资源供需矛盾将会加剧,为确保区域水资源良性循环,势必采取积极有效的水资源管理模式.

Application of CPSP model to agricultural water management in well irrigation region in North China

In order to study the variation of the regional water use and the water consumption under different water resources management measures,the CPSP model was selected as the regional water balance analysis tool in Beijing Daxing county.The regional water resources consumption,the regional water withdrawals and the water situation indicators were analyzed under different water management measures such as high water use efficiency,deficit irrigation,good crop structure and water resources importation,et al.The results show that,for water shortage region,the pressure of water resources shortage could be alleviated under different water management measures,such as high water use efficiency,deficit irrigation and improved crop structure.Especially,the quality of water withdrawals and water consumption could be decreased apparently under the deficit irrigation and the improved crop structure.Meanwhile,the proportion of surface water resources and groundwater resources recharge from returned water would be reduced.In a word,once the effective water resources management measures are put into use,it would be benefited to ease the pressure of the regional water shortage and reduce the risk of being polluted by the returned water.In addition,with the rapid economic development and the continuous population growth,the water use quantity will be increased sharply,which would cause the worse contradiction between supply and demand of water resource.To assure the virtuous cycle of water resources,the effective water resources management measures should be put into use such as high water use efficiency,good crop structure and water resources importation et al.