摘要
以湖州市东南部农田土壤为研究对象,采用地统计学方法对土壤重金属空间变异特征进行研究,利用单因子污染指数、尼梅罗综合污染指数、地质累积指数和潜在生态风险指数开展污染评价。结果表明,该地区土壤Cd均值高于国家土壤环境标准(Ⅱ),土壤重金属(Cr、Ni、Cu、Zn、Cd、Pb、Hg)质量比高于背景值。研究区土壤污染程度不高,由西向东Hg污染逐渐增强,Cd污染集中在南浔镇东南部和练市镇中部。土壤Hg、Cd地质累积指数分别为0.50、0.11,为轻-中度污染水平;土壤重金属单因子污染趋势由高到低依次为Cd、Hg、Ni、Zn、Cu、Cr、As、Pb,尼梅罗综合污染指数显示未达到污染水平,仅南浔镇中部、善链镇南部和旧馆镇与双林镇交界处出现轻度及以上污染;Cd的潜在生态风险程度为中等,综合潜在生态风险为轻微等级。土壤污染主要来源于农业生产活动和工业废弃物。
Case study is performed on the arable land soil in the southeast of Huzhou in this paper, the spatial distribution characteristics of soil heavy metals are studied using the Geostatistical method, in which soil pollution conditions are evaluated using single pollution index, Nemerow complex pollution index, index of geoaccumulation and potential ecological risk index. The results show that the average content of Cd in this area is higher than that of national soil environmental standard （ I1 ）, and the contents of heavy metals （Cr,Ni,Cu,Zn,Cd^Pb,Hg） are higher than the background values. It is also found that the soil pollution degree of the research area is not high, Hg pollution degree appears to increase from the west area to the east area, and Cd pollution is concentrated in the southeast of Nanxun and the middle of Lianshi. The geoaceumulation indices of Hg and Cd are 0.50 and 0.11, respectively, which belonged to light-moderate pollution. The single pollution index of each heavy metal in soil is as follow： Cd（1.47） 〉Hg（0.69） 〉Ni（0.66） 〉Zn（0.41） 〉Cu（0.31） 〉Cr（0.27） 〉As（0.25） 〉Pb（0.11）. The Nemerow complex pollution index suggests that the pollution condition of the arable soil is insignificant, only the soil in the middle of Nanxun, the south of Shanlian, and the junction area between Jiuguan and Shuanglin is lightly polluted. The potential pollution risk of Cd appears to be moderate and the comprehensive ecological pollution risk shows to be in a light level. The soil pollutions are supposed to be mainly from agricultural activities and industrial wastes.
作者
陈小磊
徐明星
简中华
CHEN Xiaolei;XU Mingxing;JIAN Zhonghua(Zhejiang institute of geological survey, Hangzhou 311203, China)
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第6期495-502,共8页
Journal of Hohai University(Natural Sciences)
基金
湖州市市本级农业地质环境调查项目(【省资】2013003)
浙江省基本农田土地质量地球化学监测试点项目(1212011080001150012-08)
关键词
土壤重金属
空间分布
污染评价
农田
湖州市
heavy metals in soil
spatial distribution
pollution assessment
arable land
Huzhou city
