栲树种群生态位动态研究

Niche dynamics of Castanopsis fargesii population.

用Levins生态位宽度及重叠、Feinsing等生态位宽度和Petraitis生态位重叠计测方法 ,处理缙云山森林群落演替系列取样 ,分析栲树种群的生态位特征及动态 .结果表明 ,栲树种群为缙云山森林群落演替顶极群落常绿阔叶林的优势种群 ,其生态位宽度随群落演替过程基本呈增长趋势 ,而资源利用程度却呈“∧”形 ;对于栲树种群和缙云山森林群落其它 1 4个优势种群间在所有 5类群落中的生态位重叠 ,仅栲树种群与典型针阔混交林中的小叶栲、光叶灰木、川灰木、薯豆、白毛新木姜子、广东山胡椒、大头茶、虎皮楠、杉木、马尾松种群上和针叶林中小叶栲、光叶灰木、杉木种群上 ,表现出显著完全特定重叠 .

The successive series of forest communities at Mt.Jinyun of Shichuan province are sampled and the niche′s characters and dynamics of Castanopsis fargesii population are studied by the methods of Levins′ niche breadth(B), Feinsing and Spears′ niche breadth(PS), and Levins′ and Petraitis′ niche overlapping. The results show that Castanopsis fargesii population is a dominant one in the evergreen broad leaved forest, which is at the climax stage in the succession of forest communities at Mt. Jinyun. Its niche breadth is increased with the successive process of the forest community, and the utilization degree of its resource shows the shape “∧'.As for the niche overlapping between Castanopsis fargesii and other 14 dominant populations of five forest communities at Mt. Jinyun, only Castanopsis fargesii population specializedly and fully overlaps with populations Castanopsis carlesii var. spinulosa, Symplocos lancifolia, Symplocos setchunensis,Elaeocarpus japonicus,Neolitsea aurata var. glauca,Lindera kwangtungensis,Gordonia acuminata, Daphniphyllum glaucescens,Cunninghamia lanceolata and Pinus massoniana in typical mixed coniferous and evergreen broad leaved forest, and with populations Castanopsis carlesii var. spinulosa, Symplocos lamcifolia and Cunninghamia lanceolata in coniferous forest.