Diversity and spatial distribution pattern of woody lianas in Saraca dives community in Nonggang Nature Reserve,Guangxi
Lianas constitute a crucial component of biodiversity in tropical forests,yet the extent of their diversity and spatial distribution patterns in the north tropical karst forest remains poorly understood.In this study,we inves-tigated the diversity and spatial distribution pattems of lianas within a typical Saraca dives community in the north-ern tropical karst seasonal rainforest of Nonggang,Guangxi.We elucidated the diversity distribution patterns of lia-nas and explored the disparities in spatial distribution patterns among distinct taxonomic groups based on 100 quad-rats,each measuring 10 m×10 m in a 1 hm2 plot.We found that:(1)In the 1 hm2 Saraca dives community,52 species of woody lianas were identified,belonging to 25 families and 43 genera.They represented 55.32％of the total woody species.Furthermore,the Simpson index for lianas was 0.909,the Shannon index was 2.842,and the Pielou evenness index was 0.723.These indices collectively indicate a relatively high level of diversity within the community.There was clear presence of dominant and endemic species.Fabaceae and Vitaceae families stood out for their remarkable species richness and abundance,respectively.Tetrastigma planicaule was the dominant spe-cies,with the highest importance value.Furthermore,endemic species constituted 34.61％of the total species num-ber.(2)Lianas demonstrated an aggregated distribution within the spatial scale ranging from 0 to 25 m.Upon removing habitat heterogeneity via the heterogeneous Poisson null model,lianas tended towards a random distribu-tion pattern as the spatial scale increased.When habitat heterogeneity was eliminated,over 70％of liana species exhibited varying patterns of random distribution across specific spatial scales.However,at finer scales,these spe-cies still exhibited aggregated distributions.These findings suggest that both habitat heterogeneity and dispersal limi-tations may influence the spatial distribution patterns of lianas.The observations suggest that both habitat heteroge-neity and dispersal limitations may influence the spatial patterns of lianas.Furthermore,there was a negative corre-lation between the aggregation of lianas and their abundance,as well as their average and maximum diameters at breast height.Notably,lianas with a climbing efficiency of 2(stem twining)exhibited a higher degree of aggrega-tion.The community of Saraca dives exhibited remarkable diversity in lianas,served as a crucial component of the community.Additionally,the spatial distribution pattern of lianas was not solely related to habitat heterogeneity,but was also influenced,to some extent,by intrinsic attributes such as climbing efficiency and mode.This study lays a crucial foundation for examining the maintenance mechanisms of species diversity in typical forest communi-ties,as well as assessing the impact of lianas on forest carbon storage and dynamic processes.
lianasseasonal rainforestspecies diversityspatial distribution patternNonggang Nature Reserve
万方数据
维普
