Spatial Heterogeneity Characteristics of Plant Height of Main Tree Species of Heptapleurum heptaphyllum Community in Fangcheng Seasonal Rainforest
The study of spatial heterogeneity has important theoretical significance for understanding the structure,function,and dynamic process of plant communities at different spatial scales.In this study,six main tree species,including Heptapleurum heptaphyllum,Sarcosperma laurinum,Aporosa dioica,Litsea variabilis,Ardisia quinquegona and Psychotria asiatica,of H.heptaphyllum community in Fangcheng sea-sonal rainforests were selected as the research objects.The spatial heterogeneity characteristics of plant height of each tree species were analyzed by geostatistical method.The results showed that within the scope of the study scale,except for the scales below 3 m and above 45 m,H.heptaphyllum was randomly distribu-ted,and the other scales were clustered.Aporosa dioica was clustered at scales below 31 m,and was random-ly distributed at scales above 31 m.S.laurinum,L.variabilis,Ardisia quinquegona,and P.asiatica were clustered on all scales.There were significant differences in the degree,composition,scale and pattern of spa-tial heterogeneity of plant height among the six tree species.The semi-variance functions of plant heights of H.heptaphyllum,S.laurinum,Aporosa dioica and L.variabilis conformed to the exponential model,while that of Ardisia quinquegona and P.asiatica conformed to the linear model.The spatial heterogeneity of plant height of H.heptaphyllum,Aporosa dioica and L.variabilis was caused by both autocorrelation and ran-dom factors,while that of S.laurinum,Ardisia quinquegona and P.asiatica was mainly caused by random factors.The research results will help to quantitatively and intuitively understand the spatial distribution sta-tus and development trend of the plant height of the main tree species in the community,and provide a theo-retical basis for the effective protection and management of the seasonal rainforest in Fangcheng.
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