伊犁河谷地下水盐运动规律研究

Investigation on dynamical laws of salt in groundwater in Yili River Basin of Xinjiang

根据研究区地质地貌,将整个研究区划分为三层阶地,通过对三层阶地的地下水盐动态进行实时监测,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在不同时期及不同分布条件下的变化情况。结果表明,地下水电导率变化与水位变化有很大关系,且表现出很强的区域特征:各阶地电导率(EC)值均随水位的上升而增加,高EC值出现在高水位区,第二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。

The entire irrigation district is divided into three terraces based on the geology and geomorphology of the study area in this research.The water-salt in soil dynamic behavior on the three terraces is real-time monitored on the spot,and the paper analyzes detailedly the change situation of groundwater conductivity along with groundwater depth at different stages and in different distribution conditions using the method of double-factor variance analysis.The results indicate that groundwater conductivity has close relation with water level,and this situation exhibits strong regional characteristics that the increase of EC value on each terrace is along with the rise of the water level,the high EC value always appears in the high water level district,and there exists significant variation of conductivity on the second terrace.In addition,the outside factors such as the micro-region environment,the human activity,the climate etc.,can also affect the dynamical process of groundwater and salt.Therefore,the reduction of the water level in this irrigation district is an important measure to control the soil salinification and is a key to realizing the sustainable development of agriculture.