焉耆典型灌区地下水质量评价与变化趋势分析

Analysis on Situation of Groundwater Quality and Change Trends in Yanqi County Typical Irrigation Area of Xinjiang

根据2013年地下水水质监测数据,采用单因子评价法对新疆焉耆县典型灌区地下水质量状况进行评价,并对地下水水质变化趋势进行分析。地下水质量评价结果表明:区内Ⅰ、Ⅱ、Ⅲ、Ⅴ、Ⅳ类地下水分别占调查总数的0、25.0%、37.5%、0、37.5%,影响地下水质量的关键指标是总硬度、TDS、SO2-4、Cl-、氨氮。地下水水质变化趋势分析结果表明:污染程度加剧的监测井占总数的70%以上,说明灌区地下水水质总体呈恶化趋势。指出地下水质量恶化受自然因素和人为因素两方面影响,应通过合理开发利用地下水资源、控制农业污染源、提高公众环境保护意识等措施遏制地下水水质不断恶化。

The groundwater quality of Yanqi County typical irrigation area of Xinjiang was assessed with single factor evaluation method by groundwater quality statistics data of 2013 and the groundwater trends were analyzed. The results of groundwater quality assessment show that the proportion of classes Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ groundwater are 0%,25%,37.5%,0% and 37.5% respectively. The main influence factors of groundwater quality are total hardness,total dissolved solids,SO2-4,Cl- and ammonia nitrogen. The changes trend analysis of groundwater quality show that the increasing degree of pollution monitoring wells accounts for more than 70% of the total,indicating the wors ening trend of groundwater quality of the irrigation area in general. It points out that the deterioration of groundwater quality affected both by natural and human factors,and should make rational exploitation of groundwater resources,control agricultural pollution,raising public awareness of environmental protection and other measures to control the deterioration of groundwater quality.