西藏色季拉山冷杉树冠营养元素的分布特征  

The Characteristics of Nutrient Distribution in the Tree Crown of Abies georgei var. smithii Forest in Mount Sejila of Tibet

作　　者：孔庆云[1] 辛学兵[1] 黄界[2] 

机构地区：[1]中国林业科学研究院华北林业实验中心,北京102300 [2]西藏农牧学院高原生态研究所,西藏林芝860000

出　　处：《林业科学研究》2007年第6期807-813,共7页Forest Research

基　　金：国家西藏林芝森林生态系统定位站资助项目

摘　　要：2001年10月15日至25日在色季拉山生态系统定位站原始冷杉林,采用标准地调查取样与实验室分析,测定了其优势树种急尖长苞冷杉林冠的养分,结果表明:1年生叶片养分总含量是多年生叶片的1.12倍;叶片在树冠阳面养分总含量高于阴面;林冠的不同高度叶片的养分含量不同;同一枝条不同部位的叶片在养分含量上也有一些差异。枝条与叶片有着相似的养分含量分布规律,这种一致性说明在养分的分配、积累过程中,枝条和叶片对养分的利用是同步的。The forest in the Southeast Tibet is the key forest region and the ecology reserve in China. In virgin forest located on positioning station for research on ecosystem in Mount Sejila of Tibet, nutrients in the tree crown of fir （Abies georgei var. smithii） forest were measured six times by sample-plot survey method and laboratorial analysis from May 13 to August 19,2001. The objective was to research on nutrient contents in the leaves and branches according to different positions, directions or ages, and on amount of nutrient stored in tree crown of fir forest in Mount Sejila, in order to provide with the scientific foundation for forest management in this region. It was showed that the total nutrient contents in annual leaves were 1.12 times that in perennial leaves, and that in the leaves exposed to the sun were more than that in the sunless ones. The height of tree crown had influence on nutrient contents in leaves and there was some difference in nutrient contents among positions in the same branch. The characteristics of nutrient distribution in the branches were the same as in the leaves, therefore it was showed that the branches and the leaves use nutrient simultaneously in the process of its distribution or accumulation.

关 键 词：西藏 急尖长苞冷杉 林冠 营养元素 

分 类 号：S791.14[农业科学—林木遗传育种]