铜尾矿自然定居腺柳对重金属吸收及分布的研究  

Heavy Metals Absorption and Distribution by Salix chaenomeloides Settled Naturally on the Copper Tailings

作　　者：田胜尼[1] 张静[1] 孙庆业[2] 李军红[3] 李晓凤[1] 

机构地区：[1]安徽农业大学生命科学学院,合肥230036 [2]安徽大学资源与环境工程学院,合肥230039 [3]合肥工业大学生物与食品工程学院,合肥230009

出　　处：《农业环境科学学报》2013年第9期1771-1777,共7页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(41171418)

摘　　要：选取安徽安庆月山铜尾矿废弃地的自然定居腺柳为研究对象,探讨自然定居腺柳对重金属Cd、Pb、Zn、Cu的吸收、转运以及在其根茎木质部、皮部、叶部中的分布差异。研究发现,腺柳植株体内的不同器官对重金属Cd、Pb、Zn和Cu的吸收与分布存在一定的差异。重金属Cd在根皮部含量最高,达到1 438.919μg·kg-1,茎木质部含量最低,为228.065μg·kg-1;Pb在根木质部含量最高,为4 010.225μg·kg-1,而在根皮部含量最低,为272.312μg·kg-1;Zn在茎皮部含量最高,为137.563 mg·kg-1,茎木质部含量最低,为11.554 mg·kg-1;Cu在茎皮部含量最高,为36.024 mg·kg-1,而茎木质部含量最低为19.786 mg·kg-1。腺柳对不同重金属的富集系数大小顺序为Cd>Zn>Cu>Pb。腺柳植株叶片中的Cd含量与铜尾矿废弃地基质土中重金属Cd、Pb、Zn、Cu的含量呈显著正相关(P<0.05),叶片中Zn含量与铜尾矿基质土中全氮的含量达到极显著正相关(P<0.01),但腺柳植株中Pb和Cu的含量与土壤中对应元素含量没有显著相关性。结果表明腺柳对土壤重金属Cd具有较好的富集特性,可用于受重金属Cd污染土壤的植物修复。Absorbing, transferring and distribution difference in xylem, bark and leaves of the heavy metal Cd, Pb, Zn and Cu for Sa//x chaenomeloides, settled naturally on a wasteland of Yueshan copper tailings, Anqing City, Anhui Province, were studied ii~ this paper. The results showed that different organs of S. chaenomeloides absorbed Cd, Pb, Zn and Cu in different ways and these metals were distributed in different parts at different contents. The Cd content was the highest in the root bark, 1 438.919 ~g＇kg-l; and was the lowest in the stem xylem, 228.065 txg kg-1. The Pb content in the root xylem was the highest, 4 010.225 μg kg-1, while it was the lowest in the root bark, 272.312 μg kg-I. The Zn content was the highest in the stem bark, 137.563 mg kg 1, and was the lowest in the stem xylem, 11.554 mg kg-1. The Cu content in the stem bark was the highest, 36.024 mg-kg-1; and was the lowest in the stem xylem, only 19.786 mg kg-1. The concern- tration coefficient order of S. chaenomeloides absorbs different heavy metals was Cd〉 Zn〉 Cu〉 Pb. The Cd content in leaves showed signifi- cantly positive correlation with the contents of Pb, Zn and Cu in the copper tailings（P〈0.05 ）, and the Zn content in leaves showed extremely significant positive correlation with the total nitrogen content in the soil （P〈0.01）, but the contents of Pb and Cu in S. chaenomeloides were not significantly correlated to their contents in the tailings. It indicated that S, chaenomeloides could enrich soil heavy metals Cd. Therefore, S. chaenomeloides could he used to remediate the soil contaminated by the heavy metal Cd.

关 键 词：铜尾矿 腺柳 重金属 富集系数 

分 类 号：X173[环境科学与工程—环境科学]