洛惠渠灌区地下水盐动态规律研究

Investigation on rules of groundwater and salt dynamical in Luohui trench irrigation district

深入了解地下水盐动态规律是解决土壤盐渍化和地下水污染等问题的基本理论之一。本研究根据洛惠渠灌区地质地貌,将整个灌区划分为三层阶地,在2005年对三层阶地上的地下水盐动态进行实时监测,将采集到的数据运用双因子方差分析方法,详细论述了地下水电导率随地下水位不同时期及不同分布条件下变化情况。结果表明,地下水电导事变化与永位变化有很大关系,且表现出很强的区域特征:各阶地E_C值均随水位的上升而增加,高E_C值出现在高水位区,第一阶地高水位电导率存在显著变异。另外微地域环境、气候、生物、人类活动等外界因素也会影响地下水盐的动态过程。因此,有效降低该灌区地下水位是控制土壤盐化的重要措施,实现农业可持续发展的关键所在。

To comprehend the nile of groundwater dynamical thoroughly is one of the basic theories to solve the problems of the soil salinization and ground water pollution.Based the geology and physiognomy about Luohui trench,this research divides the entire irrigation area into three terraces.Monitors the groundwater and salt dynamical on the spot in 2005,and uses the＂Two-Way ANOVA＂methods,analyzes concretely the change of groundwater conductivity along with the groundwater depth in differ times and vary from distributing condition.The result indicates,the variation of groundwater conductivity has a great relationship with the water level,and demonstrates very strong regional characteristic：Each terrace Ec value increases with rising of the water level,high Ec value appears in the high water level area,the conductivity of high water level of the first terrace exists a variation.But the outside factors include the micro-region environment,the human movements and the climate also can affect the groundwater and salt dynamical process.Therefore,reduces the water level of this irrigation district is the important measure to control the soil salinization and the key to realize the agriculture development.