Abstract:

In order to study the habitat characteristics of Kingdonia uniflora in the upper and middle reaches of Bailong River and clarify its quantitative characteristics of population distribution,this paper used the method of field plot survey and investigated the community vegetation of K.uniflora habitat in the upper and middle reaches of Bailong River.(1)The distribution communities of K.uniflora population were divided into five types,including Betula albosinensis+Fargesia spathacea,Abies fargesii var.faxoniana+F.spathacea,A.fargesii var.faxoniana+Rhododendron simsii,Abies fargesii+F.spathacea and A.fargesii+R.simsii;(2)In the following 4 communities of A.fargesii+R.simsii,A.fargesii+F.spathacea,A.fargesii+F.spathacea and A.faxoniana+R.simsii,there was no significant difference in height,coverage and density index of K.uniflora population;(3)The height,coverage,density and biomass of K.uniflora population in A.fargesii+R.simsii community were significantly higher than those in B.albosinensis+F.spathacea community.In Zhouqu County of the upper and middle reaches of Bailong River,K.uniflora was concentratively distributed in 5 communities under 3 specific forest groups of B.albosinensis,A.fargesii var.faxoniana and A.fargesii at an altitude of 2 700~3 600m;Compared with the community of B.albosinensis+F.spathacea at low elevation,the community of A.fargesii+R.simsii at high elevation was more suitable for the diffusion,reproduction and growth of K.uniflora population.

Key words: Zhouqu County, the upper and middle reaches of Bailong River, Kingdonia uniflora, habitat characteri-stics