宁夏青铜峡河西灌区地下水调控标准研究(一)

Groundwater regulating standard for west irrigated areas of Qingtong Gorge of Ningxia

针对灌区的地质及水文地质条件 ,着重分析了灌区内典型地下水位动态变化特征 ,指出地下水以灌溉入渗补给为主 ,灌溉制度决定地下水补给量、补给时间和补给强度 ,其变化具有明显的周期性。深入探讨了地下水位的变化与农作物生长及土壤次生盐碱化的关系 ,在此基础上初步给出灌区地下水调控标准 :在作物生育期 (5～ 7月 ) ,可将作物防治渍害和盐碱害的标准作为该时段的地下水调控标准 ;在作物秋灌期 (9～ 10月 ) ,可将防止土壤盐碱化的地下水调控标准下限 ,作为本阶段的地下水调控标准。

Based on the geologic and hydrologic conditions of the irrigated areas, the typical dynamic variation characteristics of the groundwater table were analyzed. It is pointed out that the groundwater is mainly recharged by irrigation water infiltration, and that the irrigation system determines the volume, time, and rate of recharge, whose variation is of obvious periodicity. In addition, the relationships between the variation of the groundwater table, the growing of plants, and the salinization of soil were discussed, and the groundwater regulating standard for the irrigated areas was given: during the bearing period(from May to July of each year), the standard of salinization prevention for crops could be used as the groundwater regulating standard; during the autumn irrigation period(from September to October of each year), the prescribed lower limit of groundwater regulating standard for prevention of salinization could be taken as the standard.