新疆天山西段夏季河流水化学特征及其影响因素研究

Hydrochemical characteristics and their influence on rivers in the Western part of the Tianshan Mountains, Xinjiang, China

在对天山西段两条主要河流(伊犁河、博尔塔拉河)常量离子组成进行分析基础上,结合数理统计学方法、水化学图解等方法探讨了水化学特征及其影响因素;在此基础上,对两条河流的灌溉适宜性进行了评价,以期为天山西段水环境状况评估提供科学依据。结果表明:(1)伊犁河和博尔塔拉河水体均呈弱碱性,pH分别为8.01和8.55;主要离子浓度排序一致,其中:阳离子Ca^(2+)>Na^(+)>Mg^(2+)>K^(+),阴离子HCO_(3)->SO_(4)^(2-)>Cl^(-),Piper分类图显示水化学类型为HCO_(3)-Ca·Mg;(2)博尔塔拉河和伊犁河水体离子组成主要受岩石风化作用的影响;(3)水样中93%的样品落在优良区,表明伊犁河和博尔塔拉河河水灌溉适应性评价为水质适宜灌溉。研究结果对天山西段水环境评价及水资源可持续利用具有较为重要的意义。

We analyzed the composition of constant ions in two primary rivers in the western section of the Tianshan Mountains:Ili River and Bortala River.Statistics and graphical illustration of water chemistry were used to examine the characteristics of water chemistry and their influence on these rivers.The water environment in the western section of the Tianshan Mountains was assessed to evaluate the irrigation suitability of the two rivers.Research results:The water bodies of the Ili River and Bortala River are weakly alkaline,with pH values of 8.01 and 8.55,respectively,and their primary ion concentrations were in the same order.Among them,cation Ca^(2+)>Na^(+)>Mg^(2+)>K^(+)and anion HCO3->SO_(4)^(2-)>Cl^(-).A Piper classification diagram shows that the water chemistry type is HCO_(3)-Ca·Mg.The macro ions in the water bodies of the Ili River and Bortala River are primarily affected by the weathering of rocks.Ninety-three percent of the water samples had excellent water quality,indicating that the irrigation adaptability of the Bortala and Ili Rivers is suitable for irrigation.The research results are of substantial significance to the assessment of the water environment in the western section of the Tianshan Mountains and the sustainable use of water resources.