摘要
为揭示山西省土壤重金属污染生态风险及空间分布特征,采用单因子评价、内梅罗指数、地累积指数和IDW等方法,对从公开发表学术论文中收集到的550个样点8种重金属Pb、Cr、Cd、As、Hg、Cu、Zn、Ni含量进行污染评价和空间分布表征。结果表明:8种重金属的平均含量分别为山西省土壤环境背景值的2.98、0.99、4.45、1.43、13.61、1.35、1.75、1.16倍。在8种重金属的地累积指数中,Pb、Cd、Hg表现为无~中度污染,其余5种重金属污染程度表现为清洁,Cd在城市土壤和沉积物中的地累积污染指数分别为2.90和4.01,Hg在农田中的地累积污染指数为3.86,呈现中~强度污染和强度污染特征。8种重金属内梅罗综合污染指数平均值均处于轻度污染及以上,其中Hg和Cd的均值最大,表现出重度污染特征。8种重金属RI的范围为147.85~19649.40,平均值为409.71,具有严重的生态风险。在8种重金属潜在生态风险因子中,Cd处于重度风险水平,Hg处于中度风险水平。
In order to explore the ecological risk and spatial distribution characteristics of soil heavy metal pollution in Shanxi Province,pollution evaluation and spatial distribution characterization of Pb,Cr,Cd,As,Hg,Cu,Zn and Ni from 550 samples collected from published academic papers were carried out by the single factor index method,Nemerow comprehensive index method,geo-accumulation index method and IDW method.The results showed that the average values of Pb,Cr,Cd,As,Hg,Cu,Zn and Ni were 2.98,0.99,4.45,1.43,13.61,1.35,1.75,1.16 times of the background value of soil environment in Shanxi Province.In the geo-accumulation indices of the eight heavy metals,Pb,Cd,and Hg showed no-moderate pollution,and the other five heavy metal pollution levels showed clean pollution.The cumulative pollution index of Cd in urban soils and sediments was 2.90 and 4.01,and the cumulative pollution index of Hg in farmland was 3.86,showing the characteristics of medium-intensity pollution and intensity pollution.The results of the Nemerow comprehensive pollution index showed that the average pollution index of eight heavy metals was in light pollution and above.The mean values of Hg and Cd were the largest,showing severe pollution characteristics.The eight heavy metal RIs ranged from 147.85 to 19649.4,with an average of 409.71,which had serious ecological risks.In the average ecological risk factors of 8 heavy metals,Cd was at a severe risk level,and Hg was at a moderate risk level.
作者
姚万程
刘庚
石瑛
王捷
郭利刚
YAO Wan-cheng;LIU Geng;SHI Ying;WANG Jie;GUO Li-gang(Research Center for Scientific Development in Fenhe River Valley,Taiyuan Normal University,Jinzhong 030619,China;Department of Biology,Taiyuan Normal University,Jinzhong 030619,China)
出处
《江西农业学报》
CAS
2021年第1期91-97,共7页
Acta Agriculturae Jiangxi
关键词
土壤污染
生态风险评价
重金属
山西省
Soil pollution
Ecological risk assessment
Heavy metals
Shanxi Province
