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本文通过对祁连山水源涵养林主要树种各器官生物量及动态变化进行观测研究，建立了估测乔木层单株立木各器官生物量的回归方程；估测水源涵养林总生物量为４．１７０×１０７ｔ，其中青海云杉林１．９７３８×１０７ｔ，灌木林１．５４８４×１０７ｔ；按各器官生物量排序青海云杉为：干＞枝＞根＞叶＞果，祁连圆柏为：干＞根＞枝＞叶＞果；立木各器官生物量比率反映林木生物学特性和生态学特征
In this paper, by observing the biomass and dynamic changes of major organs of water conservation forests in Qilian Mountains, a regression equation was established to estimate the biomass of individual organs of stand trees. The total biomass of water conservation forests was estimated to be 4.170 × 107t, including 1.9738 × 107t in Qinghai spruce forest and 1.5484 × 107t in shrub forest. According to the biomass of each organ, Qinghai spruce was classified as: stem> branch> root> leaf> Branches> leaves> fruit; the biomass ratio of different organs reflects the biological characteristics and ecological characteristics of forest trees