色季拉山两种典型林分枯落物持水性能

Study on the Water Holding Capacity of two typical Litter Layers of Mount Sejila

通过对藏东南原始森林典型代表地色季拉山的这两种林分枯落物持水性能进行定量研究,以求为该区森林涵养水源功能提供科学的评价依据和基础数据。通过浸泡法对色季拉山两种典型林分枯落物持水性能进行研究。两种典型林分不同层次枯落物最大持水率差异明显,高山松未分解层和半分解层的最大持水率分别为106.54%和156.93%;箭竹林半分解层为89.08%,未分解层为232.22%,为半分解层的2.6倍。在整个实验周期枯落物的吸水速率与浸泡时间存在明显的函数关系P=a(t)、P=a·e-b(t),枯落物的持水量与浸泡时间存在明显的函数关系:Q=aln(t)+b。高山松不同层次枯落物储量、最大持水量和有效拦水率均大于箭竹林。

Based on the Water Holding Capacity of two typical Litter Layers of Mount Sejila（The typical ancient forest in The southeast of Tibet）,this article to provide the scientific assessment basis and basic data for the water resource conservation of forest ecosystem in this area. Study on the Water Holding Capacity of two typical Litter Layers of Mount Sejila by maceration. The maximum water holding rate of different levels forest litter between two typical forest stand are significant,the Maximum Water Holding Capacity of undecomposed Litter layer of Pinus densata is 106.54%,and the Maximum Water Holding Capacity of semi-decomposed Litter layer is 156.93%; the Maximum Water Holding Capacity of semi-decomposed Litter layer of Arrow bamboo is 89.08% ,and the Capacity of undecomposed Litter layer is 232.22% ,it is 2.6 times of the semi-decomposed layer. During the testing cycle,the sorptive rate and soaking time of Litter are obvious function P=a（t）,P=a·eb（t）,the Water holding capacity and soaking time of Litter are obvious function：Q=aln（t） ＋b. The reserves,the Maximum Water Holding Capacity and Effective reservoir rate of different levels litter of Pinus densata are more than Arrow bamboo.