Studies On The Community Characteristics Of Temperate Coniferous Forest In Wuyishan Nature Reserve In Jiangxi Province

In this study, species composition and floristic characteristics, community quantitative and structural characteristics, characteristics of species diversity, population spatial distribution patterns, and interspecific relationships of temperate coniferous forest in Wuyi Mountain Nature Reserve of Jiangxi province were investigated. The research and results will lay good research foundation for further discussion on succession laws of this rare vegetation type, and also provide guides theoretically for better protection of existing forest resources. The results were as following:1. The vegetation type consists of 205 species of vascular plants belonging to 125 genera and 68 families, among which the tropical type is predominate at family level, and the temperate genera is more obvious than the tropical. Judging from the percentage of the distribution types at the genera, the geographical element of flora is in accord with geographical situation and climatic condition in the subtropical middle-mountainous.2. The sample plots of temperate coniferous forest were divided into 6 phytocoenosium types,12 association using hierarchical cluster analysis. The Tsuga chinensis var. tchekiangensis forest is climax, Tsuga chinensis var. tchekiangensis is not dominant species, there also has a lot of codominant species, such as Cyclobalanopsis multinervis, Carpinus viminea, Clethra cavaleriei, Betula luminifera in the tree stratum, and Yushania hirticaulis or Indocalamus tessellatus occupy absolute predominance in the shrub layer. Cryptomeria fortunei with larger diameter class has evident superiority in the Cryptomeria fortunei forest, and adult trees are the chief populations. Pinus taiwanensis occupy absolute predominance in the tree stratum of Pinus taiwanensis forest.3. Comparing the Cryptomeria fortunei and Pinus taiwanensis forest, the tree stratum of Pinus taiwanensis forest has higher diversity indices, and ecological dominance index in Pinus taiwanensis forest is the highest in these. The variation of space factors, such as elevation, slope, aspect have either greatly or slightly influenced the species diversity in the Tsuga chinensis var. tchekiangensis forest, Pinus taiwanensis forest. Changes of β diversity indices along elevation gradient was not significant in the Tsuga chinensis var. tchekiangensis forest, but obvious changes existed in the Pinus taiwanensis forest.4. The results of spatial pattern in the Tsuga chinensis var. tchekiangensis forest were as follows:The distribution of Tsuga chinensis var. tchekiangensis population showed aggregate distribution, and the degree of aggregation reached significant level. In our studying yardstick, random distribution at big tree, middle tree, and aggregate distribution at the seedling and sapling. Withered Tsuga chinensis var. tchekiangensis wood showing an aggregated distribution with the ranges of research scale. ② Correlation analysis showed that there was a remarkable negative correlation between Tsuga chinensis var. tchekiangensis and Clethra cavaleriei, Carpinus viminea respectively in the small spatial scales, and uncorrelated in the large spatial scales. However, the correlation between Tsuga chinensis var. tchekiangensis and Cyclobalanopsis multinervis was exactly the opposite. ③According to Tsuga chinensis var. tchekiangensis population structures, there was significant negative correlation between big tree, middle tree and seedling, sapling. On the southern hemlock saplings and seedlings between small spatial scales showing a significant negative correlation. ④Withered wood of Tsuga chinensis var. tchekiangensis was not associated with big tree in small range of spatial scales, and a remarkable negative correlation in larger range of spatial scales, but there were no relationship between withered wood and middle tree, seedling, sapling in whole range of spatial scales. Therefore, there exists a fierce competition between Tsuga chinensis var. tchekiangensis and individual condominant populations. The living environment formed by existence the median, large tree is not suitable to survival of seedlings, sapling, and further influence the regeneration of seedlings, and which may be one of main reasons for population decline of Tsuga chinensis var. tchekiangensis.