属性识别理论模型应用于土壤重金属污染评价

APPLICATION OF ATTRIBUTE RECOGNITION THEORETICAL MODEL IN EVALUATION OF HEAVY METAL POLLUTION IN SOIL

土壤重金属污染评价是土壤环境质量评价研究的重要组成部分。基于模糊数学理论建立的属性识别理论模型在其他环境要素评价中已有所应用,现将其应用到土壤重金属污染评价中。该法能较好地把握土壤环境质量各级标准界限的模糊性,并继承了模糊数学方法本身在评价领域应用的优点,实际操作较为简便。为较客观地反映评价因子对土壤环境质量的影响,模型中引入重金属生物有效性的概念与传统权重系数确定法相结合构造各指标权重。该模型评价结果基本上与其他评价方法的结果相一致,并能较为客观地反映出土壤环境的污染状况。

The assessment of heavy metal pollution plays an important role in evaluating the quality of the soil environment. The attribute recognition theoretical model based on fuzzy mathematical theory has been used to evaluate the environmental quality. Here, the model is applied to the assessment of heavy metal pollution in soil. The method succeeds to the advantage of the fuzzy mathematical method used in the assessment of heavy metal pollution in soil besides considering the fuzziness on the line of distinction of every criterion, easy to practice. By considering the concentration and heavy metal bio-availability, the weight of different indexes can be determined in order to objectively reflect the influence of the assessing factors. The result obtained is basically accordant with those by using other methods, which can reflect objectively the real status of the heavy metal pollution in soil.