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根据洛惠渠灌区多年观测资料与实地调查,采用灰色关联法对灌区地下水矿化度、埋深与土壤含盐量的动态关系进行了分析。阐明了3者之间的年际动态变化规律和耦合关系,建立了灌区土壤水盐动态耦合关系模型。结果表明,地下水矿化度是影响土壤含盐量的主要因素,地下水埋深对盐分的转移也起着重要的作用,各因子之间相互作用,形成了复杂条件下的耦合关系;该灌区处于脱盐和相对稳定状态,受外界因素影响,土壤含盐量变化趋势与地下水矿化度和地下水位变化趋势不一致;基于地下水矿化度和地下水埋深的土壤水盐耦合关系模型具有较高的预测精度,能够很好地定量描述土壤水盐动态变化与其影响因子之间的响应关系。
According to the observation data and field investigation of Luogui irrigation area for many years, the dynamic relationship between the salinity and depth of groundwater in the irrigation area and soil salinity was analyzed by gray relational method. The interannual dynamic changes and the coupling relationship between the three were clarified, and the dynamic coupled model of soil water and salt was established. The results show that the salinity of groundwater is the main factor that affects soil salinity. Groundwater depth also plays an important role in the salinity transfer. The interactions among the factors form a coupling relationship under complex conditions. Desalting and relative steady state. Influenced by external factors, the tendency of soil salt content is inconsistent with the tendency of groundwater salinity and groundwater level. The soil water and salinity coupling model based on groundwater salinity and groundwater depth has a higher prediction Accuracy can well describe quantitatively the relationship between the dynamic changes of soil water and salt and its impact factors.