缙云山大头茶(Gordonia acuminata)生态位研究

基于四川缙云山森林群落演替系列群落取样， 采用Ｌｅｖｉｎｓ 生态位宽度、Ｆｅｉｎｓｉｎｇ 和Ｓｐｅａｒｓ相似性比例生态位宽度及Ｌｅｖｉｎｓ 生态位重叠、Ｐｅｔｒａｉｔｉｓ 生态位重叠等计测公式， 对大头茶（ Ｇｏｒ ｄｏｎｉａ ａｃｕｍｉｎａｔａ） 种群的生态位特征及动态进行了研究。结果表明， 大头茶种群生态位宽度在演替系列群落中由小到大再减小， 它与缙云山森林群落其它优势乔木种群的生态位特定重叠主要表现在同针叶林中的川灰木（ Ｓｙｍｐｌｏｃｏｓ ｓｅｔｃｈｕｎｅｎｓｉｓ） 、杉木（ Ｃｕｎｎｉｎｇｈａｍｉａ ｌａｎｃｅｏｌａｔａ） 、马尾松（Ｐｉｎｕｓ ｍａｓｓｏｎｉａｎａ） 种群上； 反之， 其它优势乔木种群在大头茶种群上的生态位特定重叠在大头茶纯林中表现较显著； 从总体上， 所选１５ 个优势种群在各类群落中均不表现出显著的生态位普遍重叠。反映了大头茶种群在缙云山森林群落演替中的先锋拓殖作用， 亦为其常绿阔叶林的重要种群之一， 但它更重要的是一森林群落演替过渡类型的优势种群。

Study on the niche of Gordonia acuminata population in Jinyun mountain

Baesd on the sampling at different forest successional stages in Mt Jinyun of Chongqing city, the niche of Gordonia acuminata population was studied by using Levins′ breadth, Feinsing and Spears′ niche breadth, Levins′ niche and Petraitis′ niche overlap The results show that the niche breadth of Gordonia acuminata population increased, and then decreased along with the process of the forest community succession It′s specifical niche overlap mainly occurred between itself and Symplocos setchunensis population, Cunninghamia lanceolata population and Pinus massoniana population, the other dominatical species of needle-leaved forest in forest communify of Mt Jinyun To the contrary, the niches of the other tree populations specifically overlapping on Gordonia acuminata population were notable mainly in Gordonia acuminata pure forest The niches of the 15 populations selected in this papar were not notable in niche general overlap in all kinds of communify It reflects that Gordonia acuminata population was not only a pioneer, but also one main population of the evergreen broad-leaved forest community, dominating the forest community succession in Mt Jinyun