Community structure and dominant population dynamics of Rhododendron fortunei in Mount Dapanshan,Zhejiang Province
[Objective]The objective is to study the community structure and dominant population dynamics of Rhododendron fortunei in the high-altitude coniferous and broad-leaved mixed forest in Dapanshan National Nature Reserve in Zhejiang Province,and predict its future successional trends.[Method]A 1 hm2 fixed monitoring plot was established in July 2018,and woody plants with a diameter at breast height(DBH)≥1.0 cm were tagged,identified,and measured for DBH,and re-examined every 5 years.Based on species importance and dominance,the composition of community species and DBH structure of dominant species were analyzed.The population dynamics of R.fortunei were analyzed using age structure diagrams and population life tables.[Result]In 2018,a total of 4 773 woody plants were recorded,belonging to 90 species in 55 genera of 35 families.In 2023,three species disappeared from the plot,with an individual mortality rate of 1.38%and a recruitment rate of 2.38%.The forest layer structure of the plot was clear,with the sub-canopy dominated by R.fortunei species.The overall diameter class structure of all tree species in 2018 and 2023 exhibited a reversed"J"pattern,and the number of individuals with 5.0 cm≤DBH≤20.0 cm in tree species significantly increased in 2023.The population structure of R.fortunei was pyramid-shaped,mainly concentrated in age classes Ⅱ,Ⅲ,and Ⅳ,with very few individuals in age classes Ⅰ,Ⅵ,and Ⅶ.The survival curve showed that most individuals within the population could survive to their physiological lifespan,exhibiting a dynamic characteristic of stable growth.[Conclusion]The R.fortunei community has a richness of species,with a relatively stable species composition and structure in the past 5 years,characterized by a high proportion of young individuals and good regeneration.The population of R.fortunei is growing,but there is insufficient reserve of individuals in age class Ⅰ.
Rhododendron fortuneicommunity structurespatial distribution patternpopulation structurespecies diversityMount Dapanshan
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