江苏省江都县土壤环境质量综合评价

Evaluation of soil environmental quality for Jiangdu County in Jiangsu Province

在GIS支持下,确定土壤污染状况、土壤养分状况、土壤理化性状和立地条件为土壤环境评价因子,利用江苏省国土生态地球化学调查前期获得的基础数据,以30 m×30 m栅格作为评价单元,对江苏省江都县土壤环境质量进行综合评价,并结合土壤污染与养分状况对结果进行分析,并提出对策。结果表明,江都县土壤污染状况大部分处于警戒水平下,只有少数地方处于轻污染水平;土壤养分状况整体较好。综合评价表明,江都县土壤环境质量总体较好,其一等土壤与二等土壤的面积分别占总面积的49.6%和43.6%,三等土壤和四等土壤总共不到7%。

This paper aims to make an evaluation of soil environmental quality for Jiangdu County, Jiangsu province. With the support of GIS, the authors took as the primary factors soil pollution, soil nutrient, soil physical and chemic characters and terrain condition. While preparing for the evaluation, the authors collected basic data from the prophase results of the ecological geochemistry survey for Jiangsu province on soil quality. They also made a thirty-meter long grid as the cell of evaluation. During .the evaluation, some methods were adopted such as Neimieluo index method, Fuzzy Mathematic, Spatial interpolated as well as Grid analysis. Based on consulting the evaluation criteria, soil environmental quality results were classified and mapped, meanwhile according to the evaluation results of soil pollu- tion and soil nutrient, the authors gave some countermeasures and discussions. The results show that, soil pollution in Jiangdu was basically under the level of precaution, however soil pollution in some small areas suffer from pollution to a certain degree. The results also indicate that, soil nutrient in Jiangdu is in a proper condition. In accordance with our evaluation, the county＇s soil environmental quality is better on the whole, the acreage of soil of the first and second quality grade accounts for 49.6 % and 43.6 % respectively, however, that of soil with quality grades three and four is below 7% aggregately. Hence, its results also show that the method is capable and the result is trustable.