Influence of the Closed Forest on Plant Communitv Structure and Diversity
Gao Baojia Zhang Zhizhong Li Zhenyu(Hebei Forestry College, Baoding) (Forestry Resources College, BFU)
In this paper, the composition, structure and diversity of plant communities in four Chinese pine secondary forests were studied, in which the hillside were closed to facilitate afforestation with different closed time or unclosed. And it is approached to apply diversity to express the complicated degree of the species composition and the spatial structure of plant community. The Vertical Structure Diversity Index and Cover Weighted Foliage Height Diversity Index based on the Shannon-Wiener Diversity Index were used to measure the complicated degree of the vertical structure of the plant community. The results show that closed forest encourages growth of an increased number of plant species and individuals in their early stages. With time, the composition of the families in the closed forest considerably changes, and the family-species diversity obviously increases. The spatial structure of the plant community changes considerably, too. The complicated degree of the vertical structure and the layers in closed forest stands are obviously higher than that in unclosed forest stands.
【CateGory Index】： S718.5