基于层次分析法和群决策的湿地植物评价筛选

Evaluation and Selection of Wetland Plants based on Analytic Hierarchy Process and Group Decision

以层次分析法和群决策为基础,文章综合考虑水处理效果和温室气体排放两方面因素,以化学需氧量、氨氮、总氮、总磷的去除率作为水处理效果评价指标,甲烷与一氧化二氮排放通量作为温室气体排放情况评价指标,构建了湿地植物评价和筛选模型,并利用所构建的模型对菖蒲(Acorus calamus)、美人蕉(Canna indica)、水葱(Scirpus tabernaemontani)和风车草(Cyperus alternifolius)4种湿地植物进行评价和筛选。结果显示化学需氧量、氨氮、总氮、总磷作为水处理效果评价指标所占据的权重分别为0.245 9、0.201 7、0.128 0和0.125 0,甲烷和一氧化二氮排放通量作为温室气体排放指标所占据的权重分别为0.226 0和0.073 4。4种湿地植物综合得分情况为:风车草(0.799 9)>美人蕉(0.762 6)>水葱(0.719 6)>菖蒲(0.690 6),风车草在人工湿地中可达最优综合环境效益。

Based on the analytic hierarchy process and group decision,the study constructed a wetland plant evaluation and screening model.Considering the effects of water treatment and greenhouse gas emission,the model was used to evaluate and select four types of wetland plants(Acorus calamus,Canna indica,Scirpus tabernaemontani and Cyperus alternifolius).The results showed that the proportions of water treatment effect evaluation index such as the removal rate of chemical oxygen demand(COD),ammonia nitrogen(NH3-N),total nitrogen(TN)and total phosphorus(TP)were 0.245 9,0.201 7,0.128 0 and0.125 0 respectively.The proportions of methane(CH4)and nitrous oxide(N2O)emission flux as indicators of greenhouse gas were 0.226 0 and 0.073 4,respectively.The comprehensive scores of the four wetland plants were as follows:Cyperus alternifolius(0.799 9)>Canna indica(0.762 6)>Scirpus tabernaemontani(0.719 6)>Acorus calamus(0.690 6),which meant wetland constructed with Cyperus alternifolius could get the optimal comprehensive environmental benefits.