火地沟采伐迹地天然更新的调查与研究

SURVEY AND STUDY OF NATURAL REGENERATION ON THE CLEAR-CUT SITES OF HUODIGOU

通过对32个样带779个样方的调查,认为坡度、留母树否、灌木生长状况是影响皆伐后天然更新的主要因子。山脊油松林可实行留母树皆伐。皆伐后天然更新的华山松较人工更新高生长落后5～8年。皆伐后天然更新幼林树种组成复杂,稀有树种减少,演替趋向于形成华山松林。锐齿栎和光皮桦的林分是萌生——实生混交林。

Based on the survey from 32 belt-transects and 779 quadrats, it was found that slope,seed-tree,and shrub growth status are the main factors which affect natural regeneration on clear-cut sites.Pinus tabulaefor- mis stands on mountain ridge could be clear cut with seed-tree system.Hei- ght growth of naturally regenerated P.armandii stands comes 5 to 8 years later than that of young regenerated stands becomes complex,and scarce tree species decrease.Succession tends to form P.armandii forest.Both querc- us aliena var.acuteserrata and Betula luminifera stands are mixed stands consist- ing of coppicing and seeding trees.