城郊农田表层土壤铅潜在生态风险评价  

Potential Ecological Risk Evaluation of Lead in Surface Soil of Suburb Farmland

作　　者：张庆辉[1] 刘兴旺[2] 程莉[1] 贺晓慧[1] 朱晋[1] 乌云塔娜[1] 赵捷[1] 同丽嘎[1] 

机构地区：[1]包头师范学院资源与环境学院,内蒙古包头014030 [2]包头师范学院化学学院,内蒙古包头014030

出　　处：《湖北农业科学》2016年第12期3051-3055,共5页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(41461074)

摘　　要：采集包头市南郊污灌区农田表层土样,测定样品中Pb含量,将Pb土壤背景值作为污灌区农田土壤外源Pb积累的参照基准值,分析土壤Pb空间分布规律。结果表明,研究区土壤Pb含量的平均值为19.58 mg/kg,是背景值的1.04倍,外源Pb在农田表层土壤中积累富集具有平面空间差异性。种植粮食和蔬菜的Pb单因子污染指数Ci/80和Ci/50最大值为0.48和0.77,种植粮食的Pb单因子污染指数Pi〈0.70,土壤质量状况为清洁级;种植蔬菜的Pb单因子污染指数有部分取样点在0.70≤Pi〈1.00范围内,土壤尚为清洁级。表层土壤Pb潜在生态风险综合指数Ei为188,Ei在180~360范围内,Pb的综合潜在生态风险属于强。应该重视外源Pb在农田土壤环境中的潜在生态风险。The surface soils samples in stream farmland were collected in SSBT to determine the content of Pb. To analyze spatial distribution of Pb in soil,soil background value of Pb was taken as the reference value of exogenous Pb accumulation in soil of sewage irrigated farmland. The results indicated that the average content of Pb was 19.58 mg / kg,which was 1.04 times higher than that of background value in soil of HETAO. Also,the accumulation and enrichment of exogenous Pb in farmlannd surface soil showed obvious plane spatial variation. the maximum monomial pollution index of Pb in growing crop and vegetables were 0.48 and 0.77, and pollution index（Pi） of Pb in growing crop was less than 0.70. Soil quality was in clean grade; Pollution index（Pi） of Pb in growing vegetables were greater than or equal to 0.7 but less than 1 and soil quality didn＇t reach clean grade. Composite index of potential ecological risk（Ei） was 188 and Ei was greater than or equal to 180 but less than 360. It indicated that potential ecological risk of heavy metal Pb in the SSBT was strong. People should pay attention to the potential ecological risk caused by exogenous Pb pollution in soil environment.

关 键 词：铅 分布特征 农田表层土壤 污灌区 

分 类 号：X833[环境科学与工程—环境工程]