The Community Structure Characteristics And The Relation Between The Characteristics And Terrain Features Of The Old-growth Forest In Jiaohe Jilin Province

In this article, we study on the broad-leaved Korean pine forest monitoring fixed sample plot which is as large as30hm2in Jiaohe, Jilin province. We focus on the community internal structure characteristic, and the species distribution. With these effort, the results that the structural features of community and species has relevance to ecosystem productivity, and that the terrain features influence to the community structure of the fixed Jiaohe plot in Jilin province, has been taken out.This is the overview of the main results of the article.(1)After taking correlation analysis of the increment index and the species diversity index, we find out that the stem density of the community is influenced by the diversity. With the increasing of the richness of the community, the stem density remarkable increases as well, and this means that each specie improve its competitiveness by enhancing the individual number. There is a significant negative correlation of the evenness and the density, and the result of inter specific competition that among difference species is amplified quantitatively. The relationship of the diversity index and the density explains the fact that the influence of evenness is much stronger than the richness.(2)The terrain features have strong effect on the tree layer. With the topographical changing of valley to ridge, the community increment and the species diversity increase with the variation. One of the important terrain features is slope. As the slope increasing, the diversity and the total basal area are decreasing while the density increasing. The convexity has little effect on the species diversity, but it influences the increment index a lot.(3)In the fixed plot, the preverbal herbal of the community shows it’s more abundant in the species resource than the festival herbals. Furthermore, the otherness of the diversity and the structure of species composition of the aestival herbals is, bigger than that of the preverbal herbal community. As the effect of the overshadowed by the tree layer, the topographic relief plays a more important role on the distribution of preverbal herbal, while the altitude and slope influence the festival herbals a lot. As the complicated habitat conditions are, and as the smaller influence of the terrain features playing on the herbal community than the tree layer, the inner interaction of herbal community plays fiercely that provides wide growing spaces for individuals with different ecosystem characterization.