落叶松落叶前后重金属元素内外迁移循环规律研究  

TRANSFER AND CYCLING OF HEAVY METALS IN AND OUT OF THE LARCH TREES( Larix olgensis var. koreana Nakai) BEFORE AND AFTER LEAF FALLEN

作　　者：余国营[1] 吴燕玉[1] 

机构地区：[1]中国科学院沈阳应用生态研究所陆地生态系统痕量物质生态过程开放实验室

出　　处：《生态学报》1998年第2期202-209,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金;中国科学院重点资助

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％。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.

关 键 词：落叶松 重金属 迁移 循环 

分 类 号：S791.220.2[农业科学—林木遗传育种]