不同湿地植物配置对扑草净的吸收和去除效果研究

Absorption and Removal of Prometryn by Different Wetland Plant Configurations

为探究不同湿地植物配置对扑草净的去除效果,设置香根草和菖蒲生物量比例为1∶2、1∶1、2∶1及香根草和菖蒲单独种植共5个处理,以未种植植物的水体为对照,测定5 mg·L^(-1)扑草净处理5、10、15、20、25、30 d时水体和植物体内的扑草净含量,并与单一植物处理相比较,分析不同植物搭配处理对扑草净的吸收去除效果。结果表明,3种不同生物量配置处理下水体中的扑草净含量均显著低于对照和单一植物的水体;从第5天开始,2种植物搭配处理的水体中扑草净的含量已开始低于单一植物的水体;第20天时,香根草和菖蒲生物量比为2∶1的处理水体中扑草净去除率达89.6%,残留的扑草净含量仅为0.52 mg·L^(-1),显著低于其他处理。香根草对扑草净的吸收能力优于菖蒲,以香根草为优势植物(生物量大)时对扑草净的吸收效果优于以菖蒲为优势植物的处理。综上所述,2种湿地植物搭配对扑草净的吸收和净化效果优于单一植物,其中香根草和菖蒲生物量比为2∶1的处理效果最佳。本研究为深入挖掘湿地植物对水体污染物的净化潜力提供了理论参考。

To study the removal efficiency of different wetland plant configurations on prometryn,five treatments with the biomass ratio of Vetiveria zizanioides and Acorus calamus of 1∶2,1∶1,2∶1 and solid planting were set,and the untreated water as the control.The content of prometryn in water and plants was determined when the water with 5 mg·L^(-1)prometryn was treated for 5,10,15,20,25 and 30 days,respectively.Compared with the single planting,and the removal efficiency of different plant configurations on prometryn was analyzed.The results showed that the content of prometryn in three different biomass treatments was significantly lower than that in the control and single planting water.From the 5day,the content of prometryn in water treated with two plants was lower than that in water treated with single planting.On the 20day,the removal efficiency of prometryn was 89.6%in the treated water with the biomass ratio of V.zizanioides and A.calamus of 2∶1,and the residual prometryn was only 0.52 mg·L^(-1),which was significantly lower than that of other treatments.The absorption capacity of V.zizanioides to prometryn was better than that of A.calamus.With V.zizanioides as the dominant plant(with large biomass),the absorption effect of prometryn was better than that of A.calamus.To sum up,the absorption and removal efficiency of two wetland plants are better than that of a single plant,and the optimal treatment is that the biomass ratio of V.zizanioides and A.calamus is 2∶1.This study provides a reference for further research on the purification potential of wetland plants on water pollutants.