海南园地灌溉水和土壤质量评价

Environmental Quality Evaluation of Soil and Irrigation Water in Plantations in Hainan Province

为了解海南园地农产品的生产环境质量,采用单项质量指数和综合质量指数相结合的方式,评价海南省121个园地的灌溉水Pb、Cd、Hg、As、CN-、Cr6-、COD和石油类等8个指标和土壤Pb、Cd、Hg、As、Cr、Cu和Ni等7个指标。结果显示,海南园地灌溉水质优,其质量评价结果全部为1级,清洁;园地土壤整体环境质量清洁,但部分点的土壤Cd、As、Cr、Ni和Cu等重金属超标,其超标率分别为1.65%、4.96%、12.4%、14.88%和12.4%,超标原因可能主要是土壤背景值高。海南省园地灌溉水和土壤质量整体较好,应适当采取措施,防范部分土壤重金属超标影响园地农产品质量,以达到清洁生产要求。

In order to understand the quality of agricultural products producing environment in plantations of various crops in Hainan eight indicators of irrigation water:Pb,Cd,Hg,As,CN-,Cr6-,COD and petroleum,and seven indicators of soil:Pb,Cd,Hg,As,Cr,Cu,and Ni in 121 plantations in Hainan Province were evaluated by using single quality index and complex quality index.The results showed that the quality of irrigation water used in the plantations was scored as Class 1,indicating the irrigation water was good,and that the soil quality in the plantations were generally clean,except that the contents of soil heavy metals Cd,As,Cr,Ni and Cu in some plantations were higher than the limit values of the standard,which were 1.65%,4.96%,12.4%,14.88%and 12.4%higher than the standard values,respectively.High natural background value of the plantation soil might explain the higher contents of some heavy metals.The irrigation water and soil quality in the plantations in Hainan Province are generally good,and some appropriate measures should be taken to guarantee cleaner production to avoid impact of excessive contents of some soil heavy metals on the quality of the plantation products.