| Field investigations are carried out in Qinshui County,Yicheng county and Yuanqu County in the calendar mountain protection area of the central Tien Tien mountain.In Qinshui County,1 samples of 100 m x 100 m and 10 10 m x 10 m are set up in Yicheng County,and 8 10 m x 10 m samples are set up in Yuanqu County,and 118 samples are set up in all.The population and community of the species of incense tree were systematically studied by means of Quantitative Ecology and data processing by R software.These include:population structure,community classification,species diversity and interspecific association.The results show that:(1)There are 101 species of plants(21 species of trees,22 shrubs and 58 herbs),including 97 species of angiosperms,2 gymnosperms and 2 ferns,belonging to 59 families and 84 genera,among which Betulaceae,Rosaceae Rosaceae and Mao Langke Ranunculaceae are in the majority.(2)Through the study of the static life table and survival analysis of the species in Shanxi,the method is to classify the trees of the trees through the diameter of the breast,and to represent the age structure of the incense tree with the structure of the tree's diameter,and then on this basis,the static life of the species of continuous fragrant trees in Shicheng mountain is made up.The survival curve,survival function curve,mortality curve and disappearance rate curve of Lian Xiang tree were plotted according to the static life table of the incense tree.The population survival and population characteristics of Lian Shan tree in Shanxi were analyzed.The population characteristics of continuous fragrant trees in Shanxi are revealed.The results of the study show that the age structure of the tree species is less than the seedlings and young trees,the number of old age is more,and the age structure of the species is stable.The life expectancy of the population is higher at the age of XII,which indicates that the living quality of continuous incense tree is higher,and the life expectancy of individuals surviving after intense competition and environmental screening is stronger.The survival curve of the species of Deevey species is basically type III.The trend of mortality and loss rate curve of population is basically the same.The survival rate function and cumulative mortality function complement each other.In the I age class,the survival rate andthe low cumulative mortality rate are higher.The difference between the death density and risk rate curve of the species is obvious,the risk rate fluctuates more,and the risk rate is higher in the I age class.(3)4 species diversity indices were used in the study of species diversity of the plant species,the Patrick richness index,the Pielou evenness index,the Shannon-Wiener diversity index and the Simpson dominance index.The species diversity of 8 communities and 3 levels of Joe,Bush and grass were studied.The results showed that 4 diversity indices of 8 clusters of C.japonicus could well reflect the change rule of the cluster.The evenness index of cluster is obviously different,the stability of plant community is low,and the change trend of the 4indices in 8 clusters is basically the same.It can reflect the structural characteristics of plant community in the growing area of incense,and the richness index of species and the diversity index of species on the whole are: herb layer > irrigation.The tree layer > tree layer,and the evenness index of the species in the growing community of incense tree showed the characteristics of shrub layer > grass tree layer > arbor layer,and the evenness index of scent tree growing shrub layer was higher;the 4 indices of scent tree showed significant positive correlation,and the relationship between each index was close.(4)Based on the 2 x 2 list,chi square test,Pearson correlation coefficient and Spearman rank correlation coefficient were used to analyze interspecific correlation analysis.The results of chi square test showed that there were 30 dominant species,435 pairs,251 pairs,184 pairs,positive and negative correlation ratio.0.73.The results of Pearson correlation coefficient test showed that there were 291 pairs of negative associations in 30 dominant species,and 144 pairs of positive associations were positive,and the positive and negative correlation ratio was0.49.The test of Spearman rank correlation coefficient showed that there were 248 pairs of negative associations in 30 dominant species in the community,and 187 pairs of positive associations were positive,and the correlation ratio of positive and negative was 0.75. |
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