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在于田绿洲弃耕地典型地段布设两条基本平行的地下水采样带,用GPS定位,共设置13个样点,现场采样并送实验室分析,以研究其化学特征。运用统计分析发现,地下水离子平均含量,阳离子K++Na+>Mg2+>Ca2+,阴离子Cl->HCO3->SO42->CO32-,就变异系数而言,CO32-和SO42-较大,其余离子均介于30%~65%;地下水埋深、溶解性总固体和电导率的变异系数较大,均大于50%,pH值的变异系数最小,为3.06%,且pH值的变化范围在8.35~9.28之间,呈弱碱性。通过主成分分析发现,影响研究区浅层地下水化学特征的主成分共有3个,第一主成分F1与K++Na+、Cl-和CO32-具有显著的相关性,第二主成分F2与埋深和SO42-具有较显著的相关关系,第三主成分F3与Mg2+相关关系显著,且这3个主成分已涵盖所有8项指标信息的83%以上。线性回归分析显示,溶解性总固体与K++Na+和Cl-的相关关系显著,且拟合方程具有显著的统计学意义。
In the oasis of oasis abandoned land typical two sections parallel to the groundwater sampling zone, using GPS positioning, set a total of 13 samples, on-site sampling and sent to laboratory analysis to study its chemical characteristics. Using statistical analysis, it is found that the average content of groundwater ion, cation K ++ Na +> Mg2 +> Ca2 +, anion Cl-> HCO3-> SO42-> CO32-, CO32- and SO42- are larger in terms of coefficient of variation, Ranging from 30% to 65%. The coefficients of variation of groundwater depth, total dissolved solids and conductivity were all larger than 50%, the coefficient of variation of pH value was the lowest (3.06%), and the pH value ranged from 8.35 ~ Between 9.28, was weakly alkaline. Principal component analysis showed that there are three main components that affect the chemical characteristics of shallow groundwater in the study area. The first principal component F1 has a significant correlation with K ++ Na +, Cl- and CO32-. The second principal component F2 is similar to the buried There was a significant correlation between SO42- and SO42-. The third principal component F3 was significantly related to Mg2 +, and these three principal components covered more than 83% of all eight indicators. Linear regression analysis showed that there was a significant correlation between total dissolved solids and K + + Na + and Cl-, and the fitting equation had significant statistical significance.