镉污染稻田修复效果评估指标体系的构建

为科学评估镉污染稻田修复效果,运用理论分析、文献分析、德尔菲法与层次分析方法开展了评估指标筛选与权重确定研究,建立了镉污染稻田修复效果评估指标体系。基于修复效果评估目标,指标体系包括土壤肥力、重金属污染、水稻生长安全、修复经济安全等4个准则层下共15个评估指标。指标体系的准则层中水稻生长安全权重(0.430)和重金属污染权重(0.340)最大,指标层中土壤有效镉消减量权重(0.219)和糙米含镉量权重(0.259)最大,本指标体系权重分配体现了粮食安全和土壤环境安全是镉污染稻田土壤修复的主要关注点。

Construction of an evaluation index system to evaluate the remediation effect of cadmium pollution in paddy soils

To evaluate the remediation effect of cadmium-contaminated paddy fields, theoretical and literature analyses, the Delphi method, and the analytical hierarchy process were used to study the screening of evaluation indexes and weight determination to establish an evaluation index system. Based on the evaluation objective of the remediation effect, the indicator system included 15 indexes in 4 criteria layers that included soil fertility, heavy metal pollution, rice growth safety, and economic security for remediation. For the criterion layer of the indicator system, the weight of the growth safety of rice(0.430)and of heavy metal pollution(0.340)were the largest, whereas the weight for the reduction of available cadmium(0.219)and cadmium content in brown rice(0.259)were the largest among the 15 indexes. The weight distribution of the indicator system shows that food security and soil environmental safety are the main concerns for soil restoration of cadmium-contaminated paddy fields. This study provides a research framework for establishing an evaluation system for the remediation effect of cadmium-contaminated paddy fields.