浙江金华北山石生藓类分布与环境关系的排序分析

采用样方法调查了浙江金华北山石生环境30个样点167个样方,共记录86种,其中,丛藓科(Pottiaceae)、青藓科(B rachythec iaceae)、羽藓科(Thu id iaceae)和灰藓科(Hypnaceae)为4个大科,含的种数分别为11、11、10和8种。含种数较多的属为真藓属(Bryum)、凤尾藓属(F issidens)和青藓属(Brachythecium),分别含有7、7和6种。对86种藓类植物分布与环境关系的典范对应分析表明,海拔高度、水分条件和光照强度是影响金华北山石生藓类分布的主要环境因素。海拔决定藓类植被的类型,进而影响光照、岩表温度和水分条件。石面光洁度对石生藓类分布也有一定的影响,而石面坡度与其分布没有显著的相关性。

On Saxicolous Moss Species and Their Relationships with Environmental Factors Based on Ordination Analysis in Beishan,Jinhua,Zhejiang Province

Saxicolous mosses were sampled over different habitats of Beishan,Jinhua City,Zhejiang Pro-(vince).86 moss species from a subset of 167 quadrats in 30 sites were recorded.The dominant families in species number are Pottiaceae(11 spp.),Brachytheciaceae(11 spp.),Thuidiaceae(10 spp.) and Hypnaceae(8 spp.).The dominant genera in species number are Bryum(7 spp.),Fissidens(7 spp.) and Brachythecium(6 spp.).Canonical correspondence analysis(CCA) based on the ecological important values of these 86 species and six environmental variables revealed that the distribution of these 86 moss species is significantly related to altitude,water availability and light intensity.Altitude is a primary determinant of plant cover,which in turn affects light,water availability,and therefore bryophyte distribution.The microtopography of boulders also accounts for the distribution.But no distinct relationship was showed between the inclination angle of the boulders and the distribution of the mosses.