乌鲁木齐市水磨河沿岸土壤重金属污染现状及评价

发布时间：2018-06-16 06:30

  本文选题：水磨河 + 沿岸土壤　； 参考：《水土保持学报》2016年06期

【摘要】：选择干旱区典型城市河流乌鲁木齐市水磨河为研究区,结合经典统计学与地统计学相关方法理论,研究了乌鲁木齐市水磨河沿岸土壤重金属含量的分布特征及其污染评价。结果表明:水磨河沿岸土壤重金属含量在土层深度上差异较小;从土地利用方式来看,人为活动明显干扰重金属在沿岸土壤分布中的含量变化,重金属元素间的相关关系在一定程度上反映着几种重金属的同源性与差异性;主成分分析表明,Cu和Zn为水磨河沿岸土壤特征重金属元素,且重金属因子负载图表明Cu和Zn含量存在多因素控制;从空间分布来看,水磨河表层土壤重金属含量分布高值点位置基本相似,主要在河流南端(上游硫磺沟附近)并与河道遇水库、遇支流有关,高值点主要集中在青格达湖、塔桥湾水库、九道湾水库和硫磺沟附近;水磨河沿岸不同土层重金属的单因子污染指数平均值均小于1,整体表现为未污染状态;内梅罗综合污染指数分别为1.26(0—20cm),1.20(20—40cm),1.32(40—60cm),介于1.0P≤2.0之间,处于Ⅲ级,为轻度污染;各土层对不同重金属具有较高的承载力,属中容量区,水磨河沿岸整体土壤重金属环境质量良好。综上可知,Cu和Zn是主要的污染重金属元素,重金属污染受到工厂分布、河流改道及水库建设等人为活动影响。综合不同评价结果认为,目前水磨河沿岸土壤处于未受污染或轻度污染状态,环境质量良好。
[Abstract]:Based on the theory of classical statistics and geostatistics, the distribution characteristics and pollution evaluation of heavy metal content in the soil of Urumqi, a typical urban river in arid area, were studied in this paper. The results showed that the content of heavy metals in the soil along Shuimo River had little difference in the depth of soil layer, and from the way of land use, anthropogenic activities obviously interfered with the changes of heavy metals in the distribution of soil along the coast. The correlation between heavy metal elements to some extent reflects the homology and difference of several heavy metals, and the principal component analysis shows that Cu and Zn are the characteristic heavy metal elements in the soil along the coast of the Shuimo River. The heavy metal factor load diagram showed that the Cu and Zn contents were controlled by many factors, and the distribution of heavy metals in surface soil of Shuimo River was similar to that of the high value points in the distribution of heavy metals in the surface soil of Shuimo River. It is mainly located at the southern end of the river (near the upstream sulfur ditch) and is related to the river channel and tributaries. The high value points are mainly located near the Qinggeda Lake, the Taqiao Bay Reservoir, the Jiudaowan Reservoir and the Sulphur ditch. The average value of single factor pollution index of heavy metals in different soil layers of Shuimo River is less than 1, and the integrated pollution index of Nemero is 1.26 ~ 20 ~ 20 cm ~ (-1) ~ (40) cm ~ (-1) ~ (32) ~ (40) cm ~ (-1) ~ (60) cm ~ (-1), which is between 1.0 P 鈮，

本文编号：2025723