热带北缘鹅凰嶂季雨林四种群落特征及成熟度分析

nalyzing the community characteristics of tropical monsoon forests with differentsuccession is aiming to provide scientific basis for assessing their community assemblymechanisms and forest structure optimization. In this study, we investigated four different plantcommunities named A, B, C, and D, respectively, in a typical monsoon forest of E huangzhang inYangchun, Guangdong Province, in attempt to analyze their species composition, biodiversity andspatial structure, determine their maturity levels differences, predict succession directions, andmake suggestions for optimization. The result were as follows: (1) The forest layers of the fourcommunities were single. Small diameter at breast height (DBH) class trees and lower-layer trees dominated these communities, owning 1~3 obvious dominant species. (2) Their Shannon-Wienerindex ranged from 2.72 to 3.74, the Simpson index from 0.90 to 0.97, and the Pielou evennessindex from 0.74 to 0.89, suggesting that their diversity characteristics were significant differences.(3) Their dominance ranged from 0.49 to 0.51, uniform angle from 0.56 to 0.61, mingling from0.54 to 0.83, stand spatial structure index from 60.57 to 71.44, spatial structure distance from53.15 to 68.53. (4) The analysis of community characteristics, diversity characteristics and spatialstructural characteristics indicating that the maturity levels in all community ranked D > A > C >B. The study reveals that all four communities are currently in the pre- or mid-term successionstages and the development space of DBH and tree height is large. The four communities were inthe moderate growth state. All trees showed a slight aggregated distribution, and the tree specieswere moderately, strongly or very strongly mingling. Besides, there was a distance in spatialstructure between the four communities and ideal stand With the development of maturity levels,the four communities will continue to succession with intolerant tree species as the main dominanttree species, and gradually and preliminarily have the typical vegetation characteristics of thedistrict forest climax community. With the development of maturity levels, the four communitiesbiodiversity and mingling will increase, the spatial structure will be optimized and the stabilitywill be enhanced. In the future, E huangzhang tropical monsoon forests should be more regulatedand protected , while the ecology of vegetation and biodiversity conservation in the area should bewidely monitored and studied in depth.