Study On Spatial Structure Of Evergreen Broadleaved Forest In Tianmu Mountain

Forest spatial structure determines the competitive situation and niche spatial trees, the research of forest spatial structure aims at finding a reasonable spatial structure and expression, and putting forward a description of the spatial structure parameters and effective restoration and reconstruction of forest, so that some processes models based on known adjacent relationship of trees can be used in the actual production. Study of dominant populations and their spatial structures of evergreen broadleaved forest can help to correctly understand the status and role of the evergreen broadleaved forest, and supply a theoretical basis for protection, restoration and reconstruction of evergreen broadleaved forest. Evergreen broadleaved forest is one of the most important plant types in the Tianmu Mountain National Nature Reserve of Zhejiang Province, and was selected as investigation plot. A typical plot in the reserve with size of 100m×100m was surveyed for tree diameter at breast height (dbh) above 5cm by Total Station(Leica TCR702Xrange) being used to measure tree coordinates. Excel software and programming were used for the preparation of preliminary data processing. Dominant populations were determined by using the dominance index. Method of eight neighbor regions was used in edge correction. C++ programming of the proceedings was used in analysis of mingling index,competition index and spatial pattern. Application software GS+ was used in geostatistic analysis. GIS technology was used in visualization analysis of mingling index, competition, spatial pattern of evergreen broadleaved forest. Results showed that the dominant populations of evergreen broadleaf tree species mainly included Cyclobalanopsis myrsinaefolia, Cyclobalanopsis glauca, and Lithocarpus brevicaudatus and exhibited multi-dominant species characteristics. These evergreen broadleaf tree species showed moderate mingling. In the evergreen broadleaf forest, the intraspecific competition is fiercer than the interspecific competition. The dominant tree species whose intraspecific competition is the fiercest, also possess the most intense interspecific competition. The competition index reduces with tree diameter increases. Most of the dominant populations have cluster trends. The diameter continuous range of evergreen broadleaved forest dominant population in Tianmu Mountain means the same spatial relevance within the scope. This study had certain theoretical significance in maintaining ecosystem health and stability, increasing the optimal management level under spatial constrains, recovery and reconstruction of evergreen broadleaved forest, and realizing sustainable development of evergreen broadleaved forest.