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蚯蚓对土壤中重金属的富集作用研究

伏小勇,秦赏,杨柳,陈学民,黄魁,侯培强
(兰州交通大学环境与市政工程学院,兰州甘肃730070)

摘要:通过向供试土壤中添加CuSO。、ZnSO。、Pb(Ac):、Hf;Cl:以模拟受污土壤,研究接种于其中的微小双胸蚯蚓对重金属的富集作用。以不加重金属盐类为对照,分别研究了不同培养时间和不同重金属浓度对富集量的影响。结果表明,蚯鳄i时各种重金属的富集量随着培养时间的增加而变化,且对不同重金属最大富集量的出现时问也不相同。在第2周时蚯蚓对cu、Pb富集量达到最大,而对zn的富集量在第4周时达到最大。与Cu、Zn、Pb的富集量相比,蚯蚓对Hg没有明显的富集作用,且对Hg的最大富集量时间不明显。在其耐受浓度范围内,蚯孵f对重金属的富集量随着重金属浓度的增加而增加,且蚯蚓对重金属的吸牧顺序为:Zn>Cu>Pb>Hg。说明了,微小双胸蚯蚂lsl,-J Cu、Zn、Pb、Hg 4种元素有~定的忍耐和富集能力,但其对重金属的忍耐和富集能力是有选择性的,说明不同重金属表现出的毒性是不一样的。研究结果初步推断,影响蚯蚓对重金属富集作用的主要原因可能是体内酶的作用,不同重金属可以从多方面干扰了动物机体内的生理生化功能。
    关键词:微小双胸蚯蚓;富集;重金属;土壤
    中图分类号:X174 文献标志码:A 文章编号t 1672—2043(2009)01—0078-06

Effects of Earthworm Accumulation of Heavy Metals in SoiI Matrix
    FU Xiao-yong,QIN Shang,YANG Liu,CHEN Xue-min,HUANG Kui,HOU Pei--qiang
    (School of Environmental and Municipal Engineering of Lanzhou Jiaotong University,i.znzhou 730070,China)
    Abstract:r11le objective ofthis work waft to investigate the effects ofearthworm(Bimastus parvus)Oil the accumulation ofheavy metals in the contaminated soil by adding CuS04'ZnSO“Pb(Ac)2 and Hgcl2.Through the comparison between adding and without adding the heavy metal salts into soil for contr01.the influences of the difierent incubation time and different concentrations on accumulation of heavy metals were studied,nle results showed that the accumulation of heavy metats in ear[hwornl body vailed with the increased incubation time when the maximum accumulation times were variously determined for the different heavy metals added.The maximum accumulation of copper and lcad could reach the maximum for two weeks。but four weeks for zinc.Howeveh accumulation of mercury,in comparison with Cu,Zn and Pb,appeared to be unobvious and did not have the significant differences with time too.The results also proved that the accumulation of heavy met-Ms in earthworm increased wi山the increase of heavy metal concentrations within its tolerance limitation.The heavy metats were absorbed by earthworm in priority following the order as Zn>Cu>Pb>Hg.It certified that the earthworm had the capability of tolerance and accumulation to copper,zinc,lead and mercury,but these capabilities had the apparent selectivity,indicating that the different heavy metals showed abig dn ference in toxicity.On basis of the research results.it could be inferred that山e main reason influencing the heavy metal accumulation might be the effect of enzyme in earthworm body.The different heavy metals could interfere with the physiological and biochemical fractions of animals from various aspects.
   Keywords:Bimastus parvus;accumulation;heavy metals;soll
    目前,土壤重金属污染的日益加剧对人类的生存和生态维持构成了严重威胁,尤其是复合重金属污染,因此污染土壤的生态安全评价和治理已成为环境研究领域中的热门课题之一,受到高度重视{I-21。利用生长在污染上壤中的蚯蚓作为指示生物,可以评价和预测土壤污染水平和生态风险。在自然生态系统中,蚯蚓生活在土壤中,是污染物从土壤到食物链高营养级转移的重要环节。

蚯蚓对土壤中重金属的富集作用研究

 

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