几种牧草对铜尾矿重金属的抗性及其微生物效应  

Resistance to heavy metals by several forage grass and its microbial effects from copper mine tailings

作　　者：龙健[1] 黄昌勇[1] 滕应[1] 姚槐应[1] 

机构地区：[1]浙江大学环境与资源学院资源科学系,杭州310029

出　　处：《环境科学学报》2004年第1期159-164,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金 (40 1710 5 4 ) ;国家重点基础研究发展规划项目 (2 0 0 2CB4 10 80 4 )

摘　　要：铜尾矿是一类重金属含量极高 ,对植物生长产生毒害的生境 .盆栽试验结果表明 ,4种牧草在纯尾矿以及由尾矿和对照土壤组成的混合尾矿上都能生长 ,但植物的长势随尾矿中重金属含量的增加而减弱 ,4种牧草对重金属的抗性依次表现为百喜草 >苇状羊茅 >黑麦草 >狗芽根 .此外 ,Biolog结果显示 ,土壤微生物群落代谢剖面 (AWCD)及群落丰富度、多样性指数与牧草的长势密切相关 ,种植牧草后能明显地提高土壤微生物群落功能多样性 ,提高幅度表现为百喜草 >苇状羊茅 >黑麦草>狗芽根 ,百喜草可望成为金属尾矿植被恢复的先锋牧草 .Copper mine tailings are usually hostile to plant colonization because of their high concentrations of heavy metals. A pot experiment was conducted in a greenhouse. The results indicated that four kinds of grass could survive in copper mine tailings, the control or their mixed substrates, but grew the worst in pure tailings and the best in the control. Resistance to heavy metals was Paspalum notatum>Festuca arundinacea>Perennial ryegrass>Cynodon dactylon.Plantation of grass could enhance the activities of microorganisms and result in higher microbial biomass. Biolog data showed that soil microbial metabolic profiles(AWCD)values,community richness and diversity index were closely related to the growth patterns of grass,and could improve soil microbial community functional diversities,the ranking of improvement was Paspalum notatum>Festuca arundinacea>Perennial ryegrass>Cynodon dactylon.The Paspalum notatum could be a better species for the revegetation of tailings.

关 键 词：牧草 铜尾矿 重金属污染 抗性 微生物效应 生物监测 

分 类 号：X835[环境科学与工程—环境工程] X172