地理科学 ›› 2007, Vol. 27 ›› Issue (3): 395-400.doi: 10.13249/j.cnki.sgs.2007.03.395

• 论文 • 上一篇    下一篇

长江三角洲地区土壤重金属污染特征及潜在生态风险评价——以江苏太仓市为例

钟晓兰1,2, 周生路1, 赵其国3   

  1. 1. 南京大学地理与海洋科学学院, 江苏, 南京, 210093;
    2. 华南农业大学信息学院, 广东, 广州, 510640;
    3. 中国科学院南京土壤研究所, 江苏, 南京, 210008
  • 收稿日期:2006-01-06 修回日期:2006-08-23 出版日期:2007-05-20 发布日期:2007-05-20
  • 通讯作者: 周生路,E-mail: zhousl@nju.edu.cn E-mail:zhousl@nju.edu.cn
  • 基金资助:
    国家重点基础研究发展规划项目(2002CB410810);江苏省国土生态地球化学调查项目(20031230008)资助

Spatial Characteristics and Potential Ecological Risk of Soil Heavy Metals Contamination in the Yangtze River Delta——A Case Study of Taicang City,Jiangsu Province

ZHONG Xiao-Lan1,2, ZHOU Sheng-Lu1, ZHAO Qi-Guo3   

  1. 1. School of Geographic and Qceangraphic Sciences, Nanjing University, Nanjing, Jiangsu 210093;
    2. College of Informaties, South China Agricultural University, Guangzhou, Guangdong 510642;
    3. Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008
  • Received:2006-01-06 Revised:2006-08-23 Online:2007-05-20 Published:2007-05-20

摘要: 太仓市表层土壤Zn、Cu属强变异强度,呈对数正态分布;Cd、Ni、Hg、As、Cr和Pb属中等变异强度,呈正态分布。Cu、Hg、Zn、As显著高于当地背景值,以As累积指数和超背景值率最高;8种重金属除As自表层向下递增外,其余元素均为表层向下递减。土壤复合污染严重,土壤潜在生态风险达中等水平,黄泥土生态风险高于沙夹垅;重金属生态风险以印染厂最大,其次为电镀厂和养殖场,产生潜在生态风险为Hg、Cd,而As、Cu、Zn、Cr、Ni、Pb等多属轻微水平。

关键词: 长江三角洲, 土壤重金属, 潜在生态风险, 复合污染

Abstract: In this paper,soil contamination characteristics of 8 heavy metals(Cd,Cr,Cu,Ni,Hg,Pb,Zn and As) in the topsoil(0-20cm) from Taicang City,a typical region of the Yangtze River Delta,were analyzed,and ecological risk of soil heavy metals was evaluated by means of the potential ecological hazards index.Zn and Cu were distributed lognomally,strong in variability,while Cd,Ni,Hg,As,Cr and Pb were distributed nomally,medium in variability. The concentrations of Cu,Hg,Zn,As exceeded their background levels significantly,and As ranked first in contamination index and over limit rate.Except that As increased from the top down,all other soil heavy metals dropped off accordingly in the soil profile.Compound heavy metals contamination of the soil in Taicang was quite severe.The soil ecological hazard of Taicang was moderate,and the risk of well drained soil was higher than that of the sand with ridge.The soil heavy metals contamination was the most serious in the dyeing factories,followed by electric plating factories and breed factories.Hg and Cd brought the dominating potential ecological hazard,while As,Cu,Zn,Cr,Ni and Pb did slight hazard.

Key words: Yangtze River Delta, soil heavy metal, potential ecological risk, compound contamination

中图分类号: 

  • X53