Species Composition and Quantitative Characteristics of Seedlings in a 60 hm2 Plot in the Tropical Mountain Rainforest in Jianfengling,Hainan Island
[Objective]This paper analyzed the species composition and quantitative characteristics of seedlings in a 60 hm2 plot in the tropical mountain rainforest in Jianfengling,Hainan Island,in order to further understand the community species composition and the forest natural regeneration process.[Method]This study was conducted in a typical tropical mountain rainforest in Jianfengling,Hainan.The seedling dynamics in 290 sample stations(each with three 1 m×1 m small quadrats)in a 60 hm2 plot was monitored for 7 consecutive years(from 2013 to 2019).All seedling species were classified into four life forms,and three mycorrhizal types and species dominance were distinguished respectively.Their species composition and quantitative dynamic changes were analyzed.[Result]In the seven years,a total of 60 750 seedlings,belonging to 234 species,were recorded,including four life forms(tree,shrub,liana,and herb).There were three mycorrhizal types,including arbuscular mycorrhiza(AM).ecto-mycorrhiza(ECM),and AM & ECM mixed type.The dominant species,Psychotria asiatica and Cryptocarya chinensis,were widely distributed,occupying the top two positions in terms of importance values,abundance and frequency among all species seedlings.The distribution number of species in each seedling station was uneven.A large part of species only had sparse seedlings.[Conclusion]There are abundant species of seedlings in the tropical forests and most of them are rare.This study provides important references for understanding the dynamic changes of seedling species composition,distribution and quantity characteristics at the spatial and temporal scales,and exploring their influencing factors in the future.
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