新余市食用林产品产地土壤重金属潜在生态风险评价

Assessment of Potential Ecological Hazards of Heavy Metals in the Soils in the Areas of Edible Forest Products in Xinyu City

为了解新余市食用林产品产地土壤重金属污染状况,通过采集新余市4个行政区域的油茶、竹笋产地土壤样品,测定总砷(As)、铅(Pb)、镉(Cd)、铬(Cr)和总汞(Hg)5种重金属含量,应用土壤单项污染指数法、污染负荷指数法和重金属潜在生态危害指数法评价了新余市不同行政区域、不同林地土壤重金属的污染现状和潜在生态风险。结果发现,新余市油茶、竹笋产地土壤中5种重金属平均值和最大值均未超过《食用林产品产地环境通用要求》(LY/T 1678—2014)中的限量值;4个行政区域的2种林地土壤中5种重金属的单项污染指数为0.197~0.629,污染负荷指数为0.410~0.417,单因子潜在生态风险系数均小于40,综合潜在生态危害指数均小于100,表明新余市食用林产品(油茶、竹笋)产地土壤重金属污染、潜在生态危害均处于较低水平,未出现明显的污染状况。

In order to know the heavy metals in the soils in the areas of edible forest products.Soil samples from the main areas of edible forest products(Camellia oleifera,bamboo shoots)origin in Xinyu,China were collected,and the contents of 5 heavy metals(As,Pb,Cd,Cr,Hg)were determined.With the pollution index method,pollution load index method and potential ecological hazard index method of heavy metals the potential ecological hazards of heavy metals in the soils in the areas of edible forest products in Xinyu were assessed.The results showed that the mean and maximum contents of 5 heavy metals were all within the general environmental limit for production area of edible forest product(LY/T 1678-2014).The soil of individual pollution index was 0.197-0.629,the pollution load index was 0.410-0.417,the single factor potential ecological risk coefficients were less than 40,and the integrated potential ecological hazard index was less than 100 in 2 types of forest soil in 4 administrative areas in Xinyu.Therefore,the heavy metal pollution and potential ecological harm of the soil in the areas of edible forest products(Camellia oleifera,bamboo shoots)were at a low level in Xinyu,and no obvious pollution was found.