Community Structure and Species Composition of Secondary Forest After Clear Cutting of Phyllostachys edulis in Tianmu Mountain, Zhejiang Province

In order to further explore the restoration effect and succession pattern of natural secondary forest after Phyllostachys edulis clear-cutting, one fixed sample plot of 100 m×100 m was established in Tianmu Mountain National Nature Reserve in Zhejiang Province in 2023, where all living woody plants with a diameter at breast height （DBH）≥3 cm were tagged, identified, measured and mapped so as to obtain the analysis of species composition, faunal distribution, diameter structure and vertical structure of community.Results are as follows: （1）In the plot, 6 412 individuals belong to 110 species 85 genera 49 families including broad-leaved evergreen ,deciduous broad-leaved and coniferous species , accounting for 24.5%, 71.8% and 3.7% of total species respectively. （2） The top 3 dominant species ranked by the importance values are Mallotus apelta, Cunninghamia lanceolata and Cyclobalanopsis myrsinifolia, of which accounts for 26.2 % of the total important value .（3）The community with stratification is obvious and the vertical structure is composed of canopy layer （12 species）, sub-canopy layer （59 species） and shrub layer （106 species）. （4）The DBH of all individual of community generally fitted an “inverted-J” distribution, indicating good natural regeneration across the community and“inverted-J” “L”, single peak or double peak distribution for diameter structure of the dominant species.（5）On the level of the family, the tropical and temperate floristic elements primarily make up 56.76% and 43.24% separately, while at genus level, the tropical 52.38%, the temperate 41.67%. The secondary community with higher species diversity, more complex vertical and diameter structure is still in the primary stage of succession with deciduous species taking a dominant position in Tianmu Mountain.