钱江源地区农田土壤重金属污染分析及生态风险评价研究

Analysis and Ecological Risk Assessment of Heavy Metal Pollution in Farmland Soil in Qianjiangyuan National Park

为探究钱江源国家公园重金属污染状况,选取90个样点,监测不同土地利用类型及地役权改革措施对土壤Ni、Pb等八种重金属元素含量的影响,进行来源分析和潜在生态风险评价。结果表明,约有2.2%的样地重金属污染物超过风险筛选值。地役权改革水田的污染物含量总体小于农户水田。通过主成分分析法得出污染主要来源:来源1占比为44.2%为自然来源;来源2占比15.8%为人为来源。采用Hakanson潜在生态风险指数法,得出研究区内除Cd、Hg外6种重金属的单项生态风险属低风险;不同土地利用类型的土壤重金属污染差异不大,总体较为清洁。

In order to explore the status of heavy metal pollution in Qianjiangyuan National Park,90 sample sites were selected to monitor the effects of different land use types.Easement reform measures on the contents of eight heavy metal elements in soil,such as Ni,Pb and so on.The source analysis and potential ecological risk assessment were carried out by statistical analysis method.The results showed that the proportion of heavy metal pollutants exceeding the risk screening value was about 2.2%.Through principal component analysis,two main pollution sources were obtained:Source 1 was natural source,accounting for 44.2%;Source 2 accounted for 15.8%of man-made sources.By using Hakanson potential ecological risk index method,it is concluded that the single ecological risks of six heavy metals in the study area are all low risks except Cd and Hg.Soil heavy metal pollution of different land use types had little difference and was generally clean.