STUDIES ON THE INFLUENCE OF THE CLOSEDFOREST ON THE STRUCTURE, DIVERSITYAND STABILITY OF INSECT COMMUNITY
封山育林对昆虫群落结构及多样性稳定性影响的研究

In this paper, the influences of closed forest on the species composition, spatial and temporal structure, diversity and stability of insect community are studied. And the expression of insect community stability are aprroached, too.The investigation which are carried out in four different closed or unclosed forest stands shows that the closed forest can greatly change the composition and the structure of the insect community and make the number of the insect species and individuals, expecially the enemy group, increase obviously. The proportion of the natural enemy group in the insect community in closed forest stands increases by 33.89% more than that in unclosed forest stands. The vertical structure of the insect community becomes more complicated. In closed forest stands, the insedt species number and diversity index considerably increase with time,the number of the individuals changes gently, the community stability increases greatly, too.