基于不同标准的郑州市农产品产地土壤环境质量评价

Evaluation of soil environmental quality in agricultural production areas based on different standards in Zhengzhou City

以郑州市耕地土壤为例,对其表层重金属Pb、Cr、Cd、Hg、As含量进行了测定分析,按照单因子污染指数法和内梅罗综合污染指数法,分别根据有机农业生产基地环境质量标准、绿色食品产地环境质量标准、无公害食品蔬菜产地环境条件标准进行了评价,同时应用克里格插值方法进行空间特征分析。结果表明,研究区表层土壤重金属变异程度由大到小为:Hg、Cr、Pb、As、Cd;全区土壤环境质量完全满足无公害蔬菜产地环境条件的要求,北部和东南部大部分满足绿色食品产地环境质量的要求,而仅约半数的土壤适宜发展有机农业生产。可为农业生产发展规划和相关管理部门提供科学依据和辅助决策。

To appraise soil environmental quality, the study was conducted in the suburb of Zhengzhou city. The concentrations of heavy metals Cd, Hg, Pb, As and Cr in the topsoil samples were analyzed, and the soil environmental quality on the base of different criteria were evaluated by single factor index and Nemerow multi-factor index method respectively. Furthermore, the spatial variability of soil heavy metals pollution was researched with Kriging interpolation method. The analytical results indicate that the variability of soil heavy metals has the feature of Hg〉 Cr〉 Pb〉 As 〉 Cd; all the study area meet the demand of non-polluted vegetable production base environment, majority of study area is appropriate to development the green food production base, and only about half of it suit for the development of organic agricultural production base. So it could provide a credible groundwork and assistant decision-making for agricultural development planning and other relative manage department to protect cultivated land and realize the sustainable use of soil resources.