Based on the investigation on the structure and niches of secondary forests in jiulongkeng , guangze , fujian province , the distribution law was studied and natural succession tendency was worked out for primary arbors and shrubs in different slope direction , which provides scientific fundamental for artificial stimulating natural regeneration 摘要通过对福建光泽九龙坑不同坡向天然次生林的林分组成和生境的调查，研究主要乔灌木树种在不同坡向林分中的分布规律，分析出不同坡向林分的天然演替趋势，为人工促进天然更新提供科学依据。
( 2 ) compared to secondary natural forest , the amount of three main types of microbes in rhizosphere soil of different age of larix olgensis plantation correspondingly decreased largely , enzyme activity in non - rhizosphere soil reduced , the biochemical activities abated , and soil physical and chemical properties deteriorated ( 2 )与天然次生林相比，落叶松人工林不同发育阶段根际土壤三大类微生物数量均相应地有较大幅度的降低，非根际土壤酶活性减弱，土壤生化作用强度降低，土壤理化性质变坏。
