【摘要】 供试元素在落叶松各部位的含量和贮量顺序为Ｚｎ＞Ｃｕ＞Ａｓ＞Ｐｂ＞Ｃｄ，并与环境中相应元素浓度呈正相关。元素的迁移主要发生在叶和枝、干、根之间，落叶时叶中６％的Ｚｎ迁移到枝、干中，且贮量均有增加，存在明显的内循环，占总循环量的２５％；Ｃｕ、Ｐｂ、Ｃｄ、Ａｓ主要为外循环，其循环量占总贮量的２０％～７１％，循环率分别为３０％、６８％、２７％和２３％。更多还原

【Abstract】 The measured content and storage of trace elements in each parts of larch trees was Zn>Cu>As>Pb>Cd,which has positive correlations with that in soil.During the leaf falling period,a about 6% of Zn in leaves was transferred to trunk,branch and root.A general increase in Zn storage was observed demonstrating an obvious internal cycling rate Zn of 25% of the gross cycling.The cycling of Cu,Pb,Cd and As were almost external,and waried from 20%～71% of gross storage in trees and their cycling rates were 30%,68%,27% and 23% respectively.更多还原