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

作　　者：余国营[1] 吴燕玉[1] 王新[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《应用生态学报》1996年第2期201-206,共6页Chinese Journal of Applied Ecology

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

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．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 落叶 重金属元素 循环规律 

分 类 号：S792.110.2[农业科学—林木遗传育种]