海南省水果产地土壤环境质量评价

Evaluation on Environmental Quality of Soils in Fruit Producing Areas of Hainan Province

采用单项与综合质量指数法,以海南省水果产地的土壤为研究对象,开展土壤中重金属Hg、As、Pb、Cd、Cr和农药残留六六六、滴滴涕含量的抽样调查分析与评价。结果表明,全省水果产地土壤重金属和农药残留的均值均小于《食用农产品产地环境质量评价标准》(HJ 332-2006)规定的限值,各土壤监测指标的单项质量指数均小于0.7,综合质量指数为0.31,均定为1级,土壤环境质量属于清洁水平,适宜种植无公害水果;部分产地土壤中重金属含量有超标现象,海口有部分样品Hg、As、Pb、Cd、Cr超标,昌江有部分样品Cd、Cr超标,三亚有部分样品Pb、Cd超标,东方有部分样品As超标,万宁有部分样品Pb超标,澄迈、乐东、定安、文昌、临高均以Cr超标为主。土壤重金属含量间多呈正相关,其中As与Cd、Pb与Cr之间影响达到显著水平。

The soil heavy metals contents of Hg, As, Pb, Cd, Cr, and pesticide residue benzex, DDT, in fruit producting areas of Hainan province were investigated by randomly sampling. The environmental quality conditions of these heavy metals and pesticide residue were evaluated by single quality index and complex quality index. The results showed that the average content of heavy metals and pesticide residue in fruit producing areas were all under the limit value prescribed by＂HJ 332-2006＂. The single quality indices of seven elements were all lower than 0.7. The comprehensive quality index of seven elements was 0.31. The soil environmental quailty were all set at the first class belonging to clean level and were fit for the plantation of no pollution fruit. The content of heavy metals in some areas were beyond the limit values, Hg, As, Pb, Cd, and cr content of Haikou samples exceeds bid. Cd and Cr content of Changjiang samples exceeds bid; Pb and Cd content of Sanya samples exceeds bid. As content of Dongfang samples exceeds bid. Pb content of Wanning samples exceeds bid. Cr content of Chengmai, Ledong, Dingan, Wenchang, and Lingao samples exceeds bid. Most of the soil heavy metals were positively correlated in contents, and the correlation of As,Cd, Pb and Cr reached a significant level.