论文部分内容阅读
通过Piper三线图示法、系统聚类等方法对玛纳斯河中下游28个地表水样品离子化学成分进行了分析,研究了玛纳斯河流域冲积平原的水化学分布特征及影响因素。结果表明:1)研究区水体样品pH值差异较小,但矿化度和各离子组成的差别明显,从淡水到高盐矿化度水均有分布。阳离子浓度Na+>Ca2+>Mg2+>K+;阴离子浓度SO42->Cl->HCO3-。水样中K+和HCO3-的变异系数相对较小,Cl-和Na+变异系数最大。2)玛纳斯河流域冲积平原地区水化学类型主要有Ca2+-HCO3-,Na+-SO42-,Ca2+-SO42-,Na+-Cl-四种。其中Ca2+-HCO3-型占总水样的78.6%,其中仅有3个样品为Na+-SO42-型,2个样品为Ca2+-SO42-型,1个样品为Na+-Cl-型。聚类分析的结果表明玛纳斯河流域地表水化学特征表现出较为明显的空间分异性。总体来看,玛纳斯流域地表水中部分水样的水化学类型改变,主要是由于水体蒸发强度的差异以及玛纳斯河流域土壤中盐分离子被淋洗,增加了水体中的盐分离子含量从而导致水化学类型呈现出差异性。
The chemical composition of 28 surface water samples in the middle and lower reaches of the Manas River was analyzed by the Piper three-line graphic method and the system clustering method. The hydrochemical distribution features and influencing factors of the alluvial plain in the Manas River basin were studied. The results show that: 1) There is little difference in the pH value of water samples in the study area, but the difference of salinity and ion composition is obvious. Cation concentration Na +> Ca2 +> Mg2 +> K +; Anion concentration SO42-> Cl-> HCO3-. The coefficient of variation of K + and HCO3- in water sample is relatively small, and the coefficient of variation of Cl- and Na + is the largest. 2) There are four types of hydrochemicals in the alluvial plain of Manas River Basin: Ca2 + -HCO3-, Na + -SO42-, Ca2 + -SO42- and Na + -Cl-. Among them, Ca2 + -HCO3- accounted for 78.6% of the total water samples, of which only 3 samples were Na + -SO42-, 2 samples were Ca2 + -SO42- and 1 sample was Na + -Cl-. The results of cluster analysis show that the chemical characteristics of surface water in the Manas River Basin show more obvious spatial differentiation. In general, changes in the hydrochemical types of some water samples in the surface waters of the Manas Basin were mainly due to the difference in evaporation intensity of the water bodies and salt ions in the soil of the Manas River basin, thereby increasing the salt ion content in the water Leading to differences in the type of water chemistry.