基于PSR模型的铁路车辆段土壤环境质量综合评价OA

Railway vehicle depots serve as places for train inspection and maintenance,and the evaluation results of their soil environmental quality provide an important basis for railway operation and management.The HJ 964-2018 Technical Guidelines for Environmental Impact Assessment-Soil Environment(Trial)clarifies that railway maintenance sites should conduct soil environmental impact assessment when necessary.This study aims to evaluate the comprehensive quality of soil environment in railway vehicle depots from multiple dimensions.Based on the PSR model,indicators of human production activities affecting the soil environment in railway vehicle depots were selected as pressure indicators.Indicators characterizing soil environmental quality under pressure were selected as state indicators,and indicators for preventing and controlling negative soil environmental impacts during depot operation were selected as response indicators.A comprehensive evaluation system for soil environmental quality in railway vehicle depots was constructed,comprising 3 levels and a total of 16 indicators.The analytic hierarchy process was used to determine the weights of indicators,and a railway vehicle depot in Xi'an was taken as the research object to evaluate its soil environmental quality comprehensively.The results indicated that the weights of the pressure,state,and response layers in the model were 0.1047,0.6370,and 0.2583,respectively.Among the pressure layer indicators,the weights of annual emissions of nitrogen oxides,sulfur dioxide,and solid waste were relatively high.Among the state layer indicators,the weights of pollution indices of soil heavy metals,volatile organic compounds,and semi-volatile organic compounds were relatively high.Among the response layer indicators,the weight of the environmental protection investment index was relatively high.The comprehensive evaluation result of the soil environmental quality of the railway vehicle depot in Xi'an is 0.9435,which is in an ideal state.