摘要
为了研究铅锌矿区植物原位阻截土壤废渣重金属效果和配置模式,采用多种植物栽培和径流小区收集水样测定的方法,3年生植物的研究结果表明:苎麻、苦楝、构树可降低废弃尾沙坝地表径流水中重金属Pb负荷输出9.04%～9.64%。栾树、构树、芦苇、苦楝、刺槐可降低地表径流水中重金属Cd负荷输出67.0%～75.86%,构树、高羊茅、刺槐、栾树、芦苇、狗牙根、五节芒可降低地表径流水中重金属Cu负荷输出52.64%～70.97%,刺槐、女贞可降低地表径流水中重金属Zn负荷输出74.99%～78.35%;在重金属污染林地,刺槐可降低地表径流水中重金属Pb负荷输出40.96%,苦楝可降低地表径流水中重金属Cd负荷输出60.42%。构树通过植物富集,可以使铅锌尾矿区尾沙中Pb、Cd、As、Zn的含量分别降低31.87%、41.28%、29.48%、38.45%;女贞可以使铅锌尾矿区尾沙中Pb、Cd、As、Zn的含量分别降低27.31%、39.52%、33.47%、27.59%。植物原位阻截和修复重金属机理一是植物富集了土壤中重金属,二是植物使土壤中重金属形态发生了变化,这种机理有待进一步研究。
In order to study the effects of plant in-situ intercept heavy metals in soil waste residue and configuration mode in lead-zinc mining area,both various of plant cultivation and the water sample in runoff plots were studied.The results of 3-year old plants suggested that Boehmeria nivea,Cortex Meliae and Broussonetia could reduce the load output of Pb in runoff water in abandoned tailings dam 9.04%-9.64% ;Koelreuteria bipinnata,Broussonetia,Phragmites hirsute,Cortex Meliae and Robinia pseudoacacia L.could reduce the load output of Cd 67.0%-75.86% ;Broussonetia,Festuca arundinacea,Robinia pseudoacacia L.Koelreuteria bipinnata,Phragmites hirsute,Bermudagrass Cynodon dactylon（L.） Pers and Miscanthus floridulu（Labnll.） Warb could reduce the load output of Cu 52.64%-70.97%;Robinia pseudoacacia L.and Ligustrum lucidum could reduce the load output of Zn 74.99%-78.35%.In heavy-metal polluted woodland,Robinia pseudoacacia L.could reduce the load output of Pb in runoff water 40.96%;Cortex Meliae could reduce the load output of Cd in runoff water 60.42%.The contents of Pb,Cd,As and Zn reduced 31.87%,41.28%,29.48%,38.45% by the enrichment of Broussonetia,respectively and reduced 27.31%,39.52%,33.47%,27.59% by the enrichment of Ligustrum lucidum,respectively in the tailings of lead-zinc mine.There were 2 mechanisms of plant in-situ intercept and restoration heavy metals.On one hand,the plants accumulated heavy metal in soils,on the other hand,the chemical forms of soil heavy metals changed which needed further study.
出处
《中国农学通报》
CSCD
2012年第31期61-64,共4页
Chinese Agricultural Science Bulletin
基金
国家水体污染控制与治理科技重大专项"湘江流域重金属面源污染控制项目"(2009ZX07212-001-05)
关键词
重金属
径流水
负荷输出
原位阻截
铅锌矿
heavy metals
runoff water
load output
in-situ intercept
lead-zinc mine
