长白山红松阔叶混交林紫椴枝条的分解实验

研究了长白山北坡椴树（Tilia amurensis）枝条的分散进程，实验结果揭示，分解率是与各实验地的植被类型，海拔，生长季月平均大于5℃的积温等密切相关。其枝条分解的保存率（Y）与分解年龄（x）的相关，可用指数模型：Y＝e^-kx来拟合，在红松阔叶混交林，红松外叶混交林，岳桦去冷杉林及岳桦林中椴树枝条分解常数K分别为－0.168与－0.127，－0.102和－0.094。枝条原重量50％的分解年龄在上述4个森林中分别是4，5，6和7a。实验还指出，在长白山红松阔叶混交林皆伐迹地的实验条件下适当的蔽荫和浇水对分解有正面影响。而且，枝条的分解率主要是以长白山不同海拔植被类型的温度条件而转移，特别是生长季的积温。

Tilia amurensis Branch Decomposition in a Korean Pine Broad-leaved Mixed Forest on Changbai Mountain

This paper analyzed the process of Tilia amurensis branch decomposition in Korean pine broad-leaved mixed forest on North Slope of Changbai Mountain. The results showed that the decomposition rates are closely related to the vegetation types, altitude, accumulated temperature of growing season at each experiment plot. The relationships between the factors of remaining quantity (y) and the decomposition age (x) on the experiment followed the exponent function Y=e -kx. The decomposition (-k) ranged from -0.168 to -0.127, and -0.102 and -0.094, respectively in Korean pine broad-leaved mixed forest, Korean pine-spruce mixed forest, Betula ermanii conifer forest and Betula ermanii forest. The experiment also indicated that proper moisture and shading have positive effects on the branch decomposition in the clear-cutting area of Korean pine broad-leaved mixed forest on Changbai Mountain and that the decomposition rate depends on the temperature condition of different elevation vegetation types on Changbai Mountain, especially accumulated temperature in growing season.