• 关键词：地下水化学特征  时空演化  对应分析法  吉林西部

• 基金项目：中国地质调查局项目(No.1212011140027,12120114027401,12120114056201)

• 董海彪
• 吉林大学环境与资源学院, 长春 130021

• 卢文喜
• 吉林大学环境与资源学院, 长春 130021

• 安永凯
• 吉林大学环境与资源学院, 长春 130021

• 程卫国
• 吉林大学环境与资源学院, 长春 130021

• 王宇
• 吉林大学环境与资源学院, 长春 130021

• 摘要：运用对应分析方法,分析了吉林西部地下水化学特征随时间、空间的变化.对研究区进行了分区,分别确定了各区的主要影响因子,并分析了各区的主要因子随时间的变化趋势.最后,结合吉林西部的水文地质条件与人类活动,分析了地下水化学成分的来源及成因.结果显示,吉林西部地下水按照其水质特征可分为3个区:Ⅰ区,位于山前平原的通榆北部、长岭南部等地及盐碱区,阴离子主要为HCO₃^-,总碱度大,动态变化平稳;Ⅱ区,位于西部山前平原与中部低平原区间过渡带的洮南中部、通榆东北部等地,Ca²⁺、Mg²⁺含量高,硬度大,NO₃^--N含量较高,且有增大趋势;Ⅲ区,位于低平原区的乾安、前郭、大安地区,主要为高矿化度水,阴离子主要为SO₄^2-、Cl^-,阳离子为Na⁺,矿化度有增大趋势.上述分析结果符合当地实际.研究表明,地下水化学特征时空演化研究可为地下水污染的防治、生态环境的改善提供重要依据.

• Abstract：The spatio-temporal variations of chemical characteristics of groundwater in Western Jilin were analyzed using correspondence analysis method. The primary impact factors of each sub-area and the temporal change trend of main factors were identified. Finally the origins of the chemical compositions were determined considering the hydrogeological settings and human activities in the study area. The results indicate that the groundwater in study area can be classified into 3 regions according to its quality characteristics:region I in the piedmont plain of northern Tongyu, southern Changling and Saline area where the dominant anion is HCO₃^-, total alkalinity is relatively high and the dynamic is stable; region Ⅱ in the transition zone between western part of the piedmont plain and the middle low plain of the central part of Taonan, northeast Tongyu and other places where Ca²⁺,Mg²⁺ and NO₃^--N content and hardness are high and NO₃^--N concentration shows an increasing trend; region Ⅲ in the low plain of Qian'an, Qianguo and Da'an where the groundwater has an increasingly high salinity and the dominant anions and cations are SO₄^2-, Cl^- and Na⁺, respectively. It is demonstrated that temporal and spatial evolution of chemical characteristics of groundwater provides useful insights for the prevention and control of groundwater pollution and improvement of ecological environment.

• Key words：chemical characteristics of groundwater  spatio-temporal evolution  correspondence analysis method  Western Jilin

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