西湖风景区Cd污染现状及空间分布特征

The Cd Pollution Situation and Spatial Distribution in West Lake Scenic Area

利用西湖风景区7个不同土地利用类型土壤中Cd元素的含量,采用单项污染指数法和内梅罗综合污染指数法,按照国家《土壤环境质量标准》对西湖风景区Cd的污染状况做出评价,为更好地保护景区土壤和人类健康提供依据.结果表明,西湖风景区7个不同土地利用类型土壤均受到不同程度的Cd污染,其中马路边缘区域综合污染指数值为3.8433,属重度污染区域,茶园、景区绿地、林地、山林地、竹林和小区绿地的综合污染指数值分别为1.8249,2.4811,1.7279,2.3862,1.7725和1.9053,属于中度污染区域,Cd含量具有明显的规律性;西湖风景区Cd污染来源具有由交通排放的特征.

Relying on the soil Cd content in 7 different types of plots in West Lake Scenic Area,this paper focuses on evaluation of Cd contamination based on methods of single index and Nemerow Exponent according to the environment quality standard for soil,it provides the basis of better protection of soil and human health.The result shows that these 7 different types of plots have got Cd pollution to different degrees and among them,roadside is most seriously polluted and the others are moderately polluted.The Cd in West Lake Scenic Area mainly comes from transportation and the distribution possesses obvious regulation.