中文摘要：

^根据湖南会同鹰嘴界国家自然保护区内0.96 hm2次生阔叶林样地中胸径〉4 cm的树木逐一定位测定的数据,采用Hegyi的单木竞争指数模型对该森林植物群落优势种的种内与种间竞争强度进行定量分析。结果表明：该次生阔叶林内13个优势种的竞争强度排序为马尾松〈刨花楠〈红皮树〈毛豹皮樟〈赤杨叶〈城口桤叶树〈枫香〈青冈栎〈狭叶润楠〈杉木〈檵木〈南酸枣〈黄杞。其中,种内竞争大于种间竞争的优势种群为狭叶润楠、杉木、南酸枣、黄杞;种内竞争小于种间竞争的有马尾松、刨花楠、红皮树、毛豹皮樟、城口桤叶树、枫香、青冈栎;种内和种间竞争相差不大的树种为檵木和赤杨叶。各优势树种与上层树种之间的竞争较下层强烈,树木竞争强度与胸径呈负相关。

英文摘要：

Based on the data of tree location mapping and size measured in a 0.96 hm2 plot of secondary evergreen broadleaved forest in Huitong County,Hunan Province,Hegyi＇s competition index model was used to investigate intraspecific and interspecific competition intensity for dominant species trees.The results show that competition intensity of the top 13 dominant plant species was ranked in the order of Pinus massonianaMachilus pauhoiStyrax suberifoliusLitsea coreana var.lanuginoseAlniphyllum fortuneiClethra fargesiiLiquidambar formosanaCyclobalanopsis glaucaMachilus rehderiiCunninghamia lanceolataLoropetalum chinenseChoerospondias axillariesEngelhardtia roxburghiana.The tree species whose intraspecific competition was more intense than that of interspecific competition were Machilus rehderii,Cunninghamia lanceolata,Choerospondias axillaris and Engelhardtia roxburghiana.On the contrary,the tree species whose intraspecific competition was lower than interspecific competition were Pinus massoniana,Machilus pauho,Styrax suberifolius,Litsea coreana var.lanuginosa,Clethra fargesii,Liquidambar formosana,Cyclobalanopsis glauca.The tree species that had an approximate intraspecific and interspecific competition index were Loropetalum chinense and Alniphyllum fortuneii.The dominant and upper canopy species showed a strong competition intense compared to the lower trees.The competition index had negative correlation with the diameter at breast height of the objective tree.