摘要
通过对西藏色季拉山急尖长苞冷杉原始林林隙更新调查 ,研究了林隙大小与更新以及林隙形成年龄与更新的关系 ,对林隙和非林隙林分内幼苗和幼树的高生长进行了比较。结果表明 :林隙大小在 10 0m2 左右 ,最适合于苗高 2 0cm以下的更新幼苗生存 ,超过 10 0m2 ,更新幼苗随着林隙面积的增大而减少 ;林隙大小在 30 0m2 左右 ,最适合冷杉幼树和小径木的生存。林隙形成年龄在 30a左右 ,更新幼苗和幼树的数量最多 ,而小径木数量有限 ,随着林隙形成年龄的增大 ,小径木数量逐渐增多 ,而幼苗和幼树逐渐减少 ;林隙内幼苗、幼树和小径木的密度均大于非林隙林分 ;林隙对 3年生以下幼苗的高生长影响不大 ,对 4年生以上幼树的高生长有促进作用 ,特别是对 9年生至
By investigating gap generation of virgin fir forest on Mount Sejila, the size and the generation of gaps, relationship between the age and the regeneration of gaps were studied and the qualitative characteristics and the growth up of seedling, young tree and small tree between gaps and non gaps were compared. It was discovered that the gaps with area about 100 m 2 is the most appropriate for seedlings lower than 20 cm in height to exist; if the area of gap is over 100 m 2, the amount of seedling reduces with the increase of gap area; the gaps with area about 300 m 2 is the most appropriate for young fir and small diameter tree to grow. There is the most abound seedlings and young trees and less small diameter trees in the gaps ageing about thirty, the quality of small trees increases while the quality of young seedlings and trees decreases with gap age increasing. The density of seedling, young trees and small diamater trees in gaps is higher than that in non gaps. Gaps have little effect on growth of seedling aged three while they promote the growth of young trees aged four, especially they have obvious effect on growth of young trees aged from 9 to 16.
出处
《林业科学研究》
CSCD
北大核心
2002年第5期564-569,共6页
Forest Research
基金
国家林业局 (1998年 )和西藏自治区科委重点科技项目 (1999年 )的一部分
关键词
西藏
色季拉山
冷杉
原始林
林隙更新
gap regeneration
virgin fir forest
Mount Sejila, Tibet
