摘要
本文采用典型调查方法，经研究分析，揭示了甘肃河西走廊胡杨林分结构和胡杨生长进程规律。结果表明，胡杨生长成熟龄为：胸径２５－３０年，树高１５－２０年，材积４５－５０年。观察林分中，成熟林占８２．８３％，幼林仅为１７．１７％；林木以小径木占优，为８０．２％；林分内天然更新不良。胡杨林呈现出衰退状态。
The paper,through the investigation of sample quads,reveals the stand structuresand the regularities of growing courses of diversiform-leaved poplar forests in Hexicorridor of Gansu. The results show that the mature years of the tree are 25-30 years forbreast diameter, 15-20 years for hight,45-50 years for volume. In the observed standingforests,mature trees made up 82.83%;and young growths only 17.17%;the majority aresmall-diameter trees,occupying 80.2%;the natural regeneration is inadequate and adegeneration is appearing.
出处
《干旱区资源与环境》
CSCD
1994年第3期88-95,共8页
Journal of Arid Land Resources and Environment
关键词
胡杨
生长进程
林分结构
衰退
甘肃省
Diversiform-leaved Poplar,Growing Course Stand Structure,Decline.
