李乐乐,唐蛟,任秀娟,王菲,吴大付

（河南科技学院资源与环境学院,河南新乡453003）

不同土地利用方式下节节草（Hippochaete ramosissimum）对镉、铜、锌的吸附作用

李乐乐,唐蛟,任秀娟,王菲,吴大付

（河南科技学院资源与环境学院,河南新乡453003）

为研究不同土地利用方式对节节草吸附重金属的影响,利用野外调查与室内分析相结合的方法,通过9种土地利用方式下的土壤样品和节节草植株的采集,利用微波消解和ICP-MS技术进行重金属元素Cr、Cu、Zn含量的测定.结果表明：不同土地利用方式下土壤中重金属含量均表现为Cr＞Cu＞Zn,其中垃圾堆中节节草对Cr的富集系数最大,为3.65,对Cu、Zn的富集系数均小于1.桃树林中节节草对Cr、Cu、Zn的转运系数均表现为最大值,分别为1.32、1.24和2.20.通过富集系数和转运系数分析,可知节节草对于重金属具有较好的吸附作用,可以作为重金属污染修复的超富集植物.

节节草；重金属；富集系数；转运系数

Abstract:To study the impacts of Hippochaete ramosissimum on heavy metal absorption,soil and plant samples were collected in different land use patterns and the determination of cadmium,copper,lead and zinc was measured by microwave digestion and ICP-MS technology.The results showed that the amounts of heavy metals in soil was made Cr＞Cu＞Zn in all different land use types,and the maximum accumulation coefficient of H.ramosissimum on appeared cadmium among the rubbish,which could reach 3.65,while copper and zinc enrichment coefficients were less than 1.The transshipment coefficients for chrome,copper and zinc were highest in the paech grove,which was 1.32,1.24 and 2.20 respectively.Our findings showed that the H.ramosissimum had a positive impacted on heavy metal absorption and could be categorized as hyperaccumulator in the process of phytoremediation.

Key words:Hippochaete ramosissimum；heavy metal；enrichment coefficient；transfer coefficient

土壤重金属污染主要是由于人类活动将重金属带入土壤生态系统中,从而导致土壤中重金属含量明显高于其自然背景值,造成土壤生态破坏和环境质量恶化的过程.随着全球工业化程度的不断提高,重金属污染物通过工业采矿、工厂废气、汽车尾气、生活污水和工业废水排放等途径进入环境中,引起大气、土壤、水体的污染[1].我国是世界上受重金属污染最严重的国家和地区之一,大中城市每年由于生产、生活排放污水达600亿t,同时城市化进程造成大气中重金属含量超标,成为……