不同土地利用方式下的场地土壤环境容量评价

Evaluation of soil environmental capacity under different land use patterns

从土壤功能和环境风险的角度出发,结合我国具体实际,对场地土壤的不同土地利用方式进行分类,以人体健康、地下水安全、土壤生物为敏感受体,研究在不同土地利用方式下基于不同敏感受体的综合土壤环境阈值计算方法,构建场地土壤环境容量的评价方法.在此基础上,以重金属Cd为模式污染物,计算了我国红壤区不同土地利用方式下的土壤环境容量,对场地土壤环境容量的评价方法进行验证.公园用地、居住用地、工矿用地和商服用地的土壤Cd环境容量分别为11.68kg/hm^(2)、28.89kg/hm^(2)、40.84kg/hm^(2)和40.84kg/hm^(2).本研究为基于不同敏感受体的场地土壤的环境阈值和环境容量评估提供了参考方法和案例,为场地土壤环境容量的评价奠定科学基础,对提升我国场地土壤的环境管理水平具有重要意义.

The soil environmental capacity of pollutants in development land is complicated due to complex land use patterns and the need of protect diverse target receptors including human health,groundwater and soil organisms,with limited related studies.This paper classified different land use patterns of development land from the perspective of soil function and environmental risk to these receptors.Evaluation methods of soil environmental thresholds and soil environmental capacity were established based on the different sensitive receptors under different land use patterns.On this basis,using Cd as model pollutant,the soil environmental capacity under different land use patterns in red soil region of China was calculated,and the evaluation method of site soil environmental capacity was further verified.The calculated soil Cd environmental capacity of park land,residential land,industrial and mining land and commercial service land were 11.68kg/hm^(2),28.89kg/hm^(2),40.84kg/hm^(2) and 40.84kg/hm^(2),respectively.This study provided baseline methods and cases for the assessment of soil environmental thresholds and environmental capacity of development land based on protecting different sensitive receptors,providing a scientific foundation for the evaluation of regional soil environmental capacity for development land,which was of great significance for improving the soil environmental management pratice of development land in China.