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杨树落叶前后重金属元素内外迁移循环规律研究

Transferring and cycling of heavy metals in and out of poplar tree before and after its leaf fallen

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【作者】 余国营吴燕玉王新

【Author】 Yu Guoying; Wu Yanyu and Wang Xin (Institute of Applied Ecology, Academia Sinica, Shenyang 110015)

【机构】 中国科学院沈阳应用生态研究所

【摘要】 供试元素在杨树各部位的含量和贮量为Zn>Cu>As>Pb>Cd,并与环境中相应元素浓度呈正相关.落叶时元素的迁移主要发生在叶、枝、根和干之间,叶中8~48%的As、Zn迁移至主干的皮与材中,而Cu、Pb、Cd贮量均有增加,Zn、As的内循环占总循环量的40%,Cd、Pb、Cu表现为外循环,占总贮量的17~27%.同时分析了植物对土壤重金属污染的净化效率.

【Abstract】 The transferring of heavy metals in poplar tree during its leaf fallen mainly occurs in the parts of leaf-branch, root and trunk. 8~48% of As and Zn in leaf is transferred to bark and timber, and the storage of Cu, Ph and Cd is increased. The internal cycling rate of As and Zn occupies 40%, and the external one of Cd, Ph and Cu occupies 17~27% of their storage. The purification efficiency of soil heavy metals by plants is also discussed in this paper.

【关键词】 杨树重金属循环净化效率
【Key words】 Poplar treeHeavy metalsCyclingPurification efficiency.
【基金】 国家自然科学基金,中国科学院陆地生态系统痕量物质生态过程开放实验室基金
  • 【文献出处】 应用生态学报 ,CHINESE JOURNAL OF APPLIED ECOLOGY , 编辑部邮箱 ,1996年02期
  • 【分类号】S792.110.1
  • 【被引频次】44
  • 【下载频次】268
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