Tree species composition and community structure of natural secondary forests in the middle-eastern mountainous area of Northeast China
[Objective]In order to study the species composition and community structure characteristics of natural secondary forest stands in the central and eastern parts of Northeast China.[Method]Geographical network layout plots were set up in Changbai Mountain,Zhangguangcailing and Laoyeling areas,and a total of 183 plots of 0.1 hm2 were investigated.And species composition,flora characteristics,important values,diameter structure and diversity were researched in the plots.[Result]There were 15 601 trees with DBH≥5 cm in the survey area,belonging to 15 families,31 genera,and 60 species.The species of Rosaceae and Aceraceae were the most,the number of species of Crustaceae and Aceraceae was the most,and the main species were Quercus mongolica,Tilia amurensis,Acer mono,Ulmus pumila,Betula.The species composition was rich in this area.The species family spaned a total of 6 floras,the north temperate and south temperate distributed was the main,and the species genu spaned a total of 9 floras,the north temperate was the main.For the diameter-level structure of the top three tree species with important values,except that the diameter-level structure of Q.mongolica and T.amurensis in Changbai Mountain showed a normal distribution,and the tree species were concentrated in the diameter of 8-18 cm,the diameter-level structures of Ulmus pumila in Changbai Mountain,Q.mongolica,A.mono and U.pumila in Zhangguangcailing area,and Quercus mongolica,Betula davurica and Tilia amurensis in Laoyeling area were all inverted"J"shaped,and tree species were mainly concentrated below 18 cm.The species richness of the three regions was similar.Except for the Shannon-Wiener diversity index(H'),the species in Laoyeling had a significant difference with that in Changbai Mountain and Zhangguangcailing(P≤0.05),there were no significant differences among regions for other indicators of diversity,and the species similarity in the three regions was moderately similar.[Conclusion]The forest tree species are abundant in the middle-eastern mountainous area of northeast China,most of them are medium and small diameter trees,and the regeneration condition is good.The forest in this area can still develop stably in the future.The above research results can provide scientific theoretical and data support for the research and management of natural secondary forest species in the central and eastern parts of Northeast China.
NETL
NSTL
万方数据
