几种草本植物对面源微污染重金属的净化能力  

Ability of herbaceous plants to remove heavy metals from non-point sources of pollution in riparian buffer zones

作　　者：陈冬霞 刘宏伟 梁红[1,2] 沈海龙 高大文[1,2] CHEN Dong-xia;LIU Hong-wei;LIANG Hong;SHEN Hai-long;GAO Da-wen(School of Forestry, Northeast Forestry University, Harbin 150040, China;School of Environment, Harbin Institute of Technology, Harbin 150090, China)

机构地区：[1]东北林业大学林学院,哈尔滨150040 [2]哈尔滨工业大学环境学院,哈尔滨150090

出　　处：《农业环境科学学报》2017年第12期2500-2505,共6页Journal of Agro-Environment Science

基　　金：科技部"十三五"科技支撑计划项目(2015BAD07B06)~~

摘　　要：为研究草本植物对城市面源污染重金属的去除能力,选择北方地区常见的3种草本植物紫花苜蓿(Medicago sativa)、早熟禾(Poapretensis)、黑麦草(Lolium perenne),通过水培实验考察了3种草本植物对微污染重金属Cu、Cd、Pb的净化能力。研究结果表明,3种草本植物对微污染重金属Cu、Cd、Pb均有一定的净化效果。其中对Cu、Pb的去除率随污染物浓度的升高而升高,对Cd的去除率随Cd浓度的升高而下降。3种草本植物在不同生长期对面源微污染重金属污染物Cu、Cd、Pb的净化效果表现出不同特点:黑麦草在生长期去除率最高,分别为56.85%、63.72%、55.03%;紫花苜蓿幼苗期去除率最高,分别为41.98%、45.37%、68.41%;早熟禾生长期去除率最高,分别为51.25%、33.83%、26.55%。综合分析,3种草本植物可以作为滨岸缓冲带的备选植物。To study the ability of herbaceous plants to remove heavy metal micropollutants in the northeastern region of China, Medicago sativa, Poapretensis, and Lolium perenne were selected. The ability of these three species to remove Cu, Cd, and Pb was studied using hy- droponic experiments. The results showed that each of these three herbs displayed the ability to remove Cu, Cd and Pb. The removal rate of Cu and Pb increased with increasing exposure levels, while the removal rate of Cd decreased with increasing exposure levels for all three herbs. The removal effieieneies of Cu, Cd and Pb from synthetic rainwater were different for different stages of growth. Lolium perenne had a highest removal rates at the growth stage, with a removal efficiency of Cu, Cd and Ph up to 56.85%, 63.72%, and 55.03%, respectively. Medicago sativa had the highest removal rate at the seedling stage, with a removal efficiency of Cu, Cd and Ph up to 41.98%, 45.37%, and 68.41%, respectively. Poapretensis also had the highest removal rate in the growth stage, with a removal effieiency of Cu, Cd and Pb up to 51.25%, 33.83%, and 26.55%, respeetively. These results demonstrate that these three species may be used as alternative herbaceous plants for riparian buffer zones.

关 键 词：草本植物 重金属 微污染 净化能力 滨岸缓冲带 

分 类 号：X52[环境科学与工程—环境工程]