Community structure for main forests in Mount Putuo, Zhejiang Province
Community structure is a theoretically and practically important plant community research field in areas of forest development,vegetative restoration and protection,community structure optimization,and special scenic spot development.In this study,forest types of Liquidambarformosana,Camellia longicaudata,Podocarpus macrophyllus,Cyclobalanopsis glauca,young Cyclobalanopsis glauca,Loropetalum chinensis,Distylium gracile,and Cinnamomum camphora were selected to analyze their structural characteristics in subtropical forests of Zhoushan Island,Zhejiang Province.Analysis included Pielou and Shannon-Wiener indices and power-fitted curves for DBH and tree crown.Results showed that stand structure and forest appearance were relatively complete indicating that forest types were dominant species and stand structure was relatively stable.With respect to diameter-class distribution,"L" type forests were Liquidambarformosana,Camellia longicaudata,Cyclobalanopsis glauca,D.gracile,and Cinnamomum camphora;whereas,unimodal type forests were Loropetalum chinensis and young Cyclobalanopsis glauca,with P.macrophyllus forest as a "U" type for diameter-class distribution.With respect to biodiversity indices,the P.macrophyllus forest had the highest species richness;the young Cyclobalanopsis glauca forest had the lowest species richness,Pielou and ShannonWiener indices but highest average stem density;the D.gracile forest had the lowest average stem density;and the Cinnamomum camphora forest showed the lowest Shannon-Wiener and Pielou indices.Nutrition investment in the vertical direction,was highest for the Liquidambarformosana forest and lowest in the Camellia longicaudata forest (P＜0.05).Horizontal nutrition investment was highest in the P.macrophyllus forest and lowest in the Cyclobalanopsis glauca forest (P＜0.05).In the Cyclobalanopsis glauca and the Cyclobalanopsis glauca young forest,vertical nutrition investment was greater than horizontal nutrition investment (P＜0.05);the D.gracile forest was reversed (P＜0.05).In addition,power curves of tree height fit for each DBH (R2 =0.71,P＜0.01) and crown area (R2 =0.51,P＜0.01) were highly significant.Thus,stand structure in the study area was stable,diameter-class distribution was reasonable,species diversity was high,and wind resistance was strong,but some discrepancies existed meaning more efforts to optimize community structure,increase species diversity,and improve plant adaptation to island habitats were needed.
国家科技期刊平台
NSTL
万方数据
维普
