Study On Ecology Of Endemic Plant Hopea Chinensis Community In Shiwandashan

Hopea chinensis is one of the representative tropical seasonal rain forest tree species in China which distributed only in Guangxi Shiwan mountain.Hopea chinensis grow in the valley,slope and hilly area where about 600 metres above sea level.The number of hopea chinensis reduce quickly because of slow grow and the influence of human activities,.Hopea chinensis is listed class I protective plants in 1999.This paper is written on the basis of previous studies which selects four 100m×10m sample plots in a representative location near the Fengling bridge scenic spot at Huangpao Mountain,Shangsi County,Fangchenggang City in February 2015.In the 10m×10m sample plot adjacent grid method to measure the species name,coordinates,number of plants,plant height and other indicators of the arbor slope and other trees.Then record the canopy degree of each sample.,rock exposure and slope.After then applying the principles of statistical methods,population ecology and community sciencet to analyse the plant diversity of pine community,the interspecific competition in pine community,the environmental factors on the population structure and spatial distribution pattern of the slopes.The main results are as follows1、The main dominant species of hopea chinensis community is the growth type.With the passage of time,the number of species in the community should be increasing and the density increasing,but the community composition of the slope-slope community is slightly lower than that of the control community.In the past,the species type was significantly reduced,indicating that the community was seriously disturbed2.There are obvious dominant species in the two communities,and their community composition looks like similar but there are some differences In the hopea chinensis community,the hopea chinensis are the dominant species and the dominant species,which occupy the main position in the community.In the control community,the macaranga rosuliflora are the dominant species and dominant species.There are many common species between the two communities and they have certain advantages in the community3、The diameter-level structure analysis of the main dominant species in the hopea chinensis community indicated that there were more seedlings and saplings of the dominant species in the hopea chinensis community,and there were fewer middle-aged and older trees.The age structure was a typical pyramid structure,indicating the main dominant species of the hopea chinensis community.Belongs to a growth population4.、A variety of indices were used to characterize species-to-species correlation:multiple inter-association correlations were determined using the variance ratio method(VR),and paired species analysis was performed using a 2×2 joint list chi-square test and Yates continuity correction.The formula,correlation polarity was determined by PC,AC,inter-species correlation measure using Ochiai index and Dice index,and the five dominant populations were inter-species linkage analysis.The results showed that the five dominant populations showed a significant positive association in the whole,and the analysis and study of the paired interspecific associations of the ten pairs of pairs showed that four species pairs showed a significant positive association and four species pairs showed no significant negative association.5、The environmental factors have no effect on the spatial distribution type of hopea.chinensis,they are cluster distribution,which has an impact on the spatial distribution degree.The low slope will lead to the decrease of the concentration of hopea chinensis communities.