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

Abstract

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.

Key words: Poplar tree, Heavy metals, Cycling, Purification efficiency, dissolved organic nitrogen, rhizosphere, dissolved organic carbon, nitrogen addition, elevated CO₂ concentration

Yu Guoying, Wu Yanyu, Wang Xin. Transferring and cycling of heavy metals in and out of poplar tree before and after its leaf fallen[J]. Chinese Journal of Applied Ecology, 1996, 7(2): 201-206.

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

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