广州市流溪河小流域典型林分枯落物的持水特性

Water-holding capability of litter fall in Liuxihe catchment, Guangzhou city

通过对广州市流溪河常绿阔叶林和竹林地表枯落物的储量和持水性能进行调查分析,结果表明:(1)常绿阔叶林地表枯落物的储量为7.73 t·hm^(-2),是竹林的1.7倍;(2)常绿阔叶林枯落物的最大持水量相当于截持1.23mm的降雨,高于竹林的0.87 mm;各枯落物层的吸水量与浸泡时间的关系可用对数方程很好地拟合;(3)常绿阔叶林未分解层和树枝在浸泡4 h左右基本达到饱和,而半分解层在浸泡6 h^8 h时达到饱和;竹林枯落物层在浸泡8 h^10 h时基本达到饱和;(4)各枯落物层的吸水速率随着浸泡时间的增长呈下降趋势,两者之间的关系用幂函数方程进行拟合最好。(5)流溪河地区常绿阔叶林地表枯落物的持水性能优于竹林,从水土保持和水源涵养功能角度出发,应尽量减少竹林,增加阔叶林比例。

storage and water-holding capability of litter fall in evergreen broad-leaved forest and Moso bamboo Phyllostachys pubescens forest stand in Liuxihe forest park were investigated and analyzed. It indicated that： （1） Litter fall storage of evergreen broad-leaved forest was 7.73 t.hm-2, which was 1.7 times that of Moso bamboo forest stand. （2） Max holding water of litter fall in evergreen broad- leaved forest stand and Moso bamboo forest stand were 1.23 mm and 0.87 mm, respectively. The relationship between holding water of litter fall and immersion time can be fitted by logarithm equation. （3） Non-decomposed litter of evergreen broad-leaved forest reached saturation aider about 4h, and the saturation time of half-decomposed litter of evergreen broad-leaved forest and Moso bamboo were 6h to 8h and 8h to 10h, respectively. （4） Water absorption rate decreased with immersion time, and their relationship can be fitted by power function. （5） Water-holding capability of litter fall in evergreen broad-leaved forest was better than that in bamboo. Therefore, for the purpose of soil and water conservation, Moso bamboo forest should be cut offin Liuxihe forest park.