摘要
选取云南省绿春县规东河片区、松东河片区、二号桥河片区为样区,分析了样区土壤重金属Pb、Cr、Cu和Zn的分布特征,与云南土壤背景值作参比,并采用Hakanson潜在生态危害指数法对样区的重金属潜在生态风险进行评价。结果表明,①云南省绿春县哈尼梯田土壤重金属含量Pb在11.964~28.558 mg/kg,平均为19.520 mg/kg;Cr在7.168~18.747 mg/kg,平均为10.923mg/kg;Cu在9.359~27.715 mg/kg,平均为14.383 mg/kg;Zn在21.194~41.782 mg/kg,平均为33.985 mg/g。采样区各元素含量均低于云南土壤背景值。②从不同土地利用方式来看,Cu含量干田显著高于旱地,Zn含量旱地显著高于干田,Pb、Cr含量在水田、干田和旱地之间差异性不显著。③研究区域潜在生态危害系数重金属Pb平均为2.404,Cu为1.553,Cr和Zn分别为0.335和0.379。综合评价研究区重金属Pb、Cr、Cu和Zn的潜在生态危害指数为4.671,重金属潜在生态危害程度极低。
This paper studied distribution of the heavy metals including Cr,Cu,Pb,and Zn in the soils of Hani Terrace in Lvchun County of Yunnan Province collected from three sections,Guidong River patch,Song dong River patch,Erhaohe River patch,and then were compared with the background values（BV） of soil heavy metals in Yunnan Province.By using the Hakanson′method of potential ecological risk assessment,the potential ecological risk of heavy metals were estmiated.The result showed that（ⅰ） In the soils of Hani Terrace in Lvchun County,the contents of Pb was between 11.964 to 28.558 mg/kg,the contents of Cr was between 1.168 to 18.747 mg/kg,the contents of Cu was between 9.359 to 27.715 mg/kg,the contents of Zn was between 21.194 to 41.782 mg/kg,the average contents of Cr,Cu,Pb and Zn were lower than BV.（ⅱ） under different land use in Hani terrace in Lvchun County,the contents of Cu in dry field were significantly higher than that in dry land,the contents of Zn of dry land were significantly higher than that in dry field,the contents of Pb and Cr were no remarkable differences under different land uses（paddy field,dry field and dry land）.（ⅲ） The potential ecological risk factor of Pb and Cu was 2.404 and 1.553,respectively,and Cr and Zn was 0.335 and 0.379,respectively.The potential ecological risk index was 4.671.The potential ecological risk was extremely low.
出处
《西南农业学报》
CSCD
北大核心
2010年第6期1980-1984,共5页
Southwest China Journal of Agricultural Sciences
基金
云南省教育厅重点科研基金(09Z0093)
红河学院博研科研基金(xss08016)
关键词
哈尼梯田
土壤
重金属
潜在生态危害评价
Hani terrace
Soil
Heavy metals
Potential ecological risk assessment
