湖北七姊妹山长柄水青冈林群落学特征研究

长柄水青冈是水青冈属植物中在我国分布范围最广泛的种类,但由于人类高强度干扰活动的影响,自然状态的长柄水青冈群落已罕见.该研究对分布在七姊妹山自然保护区的原始长柄水青冈林群落学特征进行了分析.结果表明：七姊妹山的长柄水青冈群落有植物91种,分属43科、68属;群落属的区系成分以北温带分布类型占优势,有20个属,占30.30％,群落区系成分中,热带成分和温带成分所占比例大体接近;重要值分析表明,群落中长柄水青冈具有明显优势,多脉青冈、箭竹和格药柃为次优势种;除物种丰富度外,其他多样性指数均表现为草本层＞乔木层＞灌木层;群落中长柄水青冈Ⅰ、Ⅱ级立木所占比例小,自然更新不良,属于衰退型群落.

Study on Community Ecology of Fagus longipetiolata Natural Community in Qizimei Mountain Natural Reserve,Hubei Province

Among the Fagus,F.longipetiolata is the most widely distributed species in China.However,natural F.longipetiolata community has been rare due to human being disturbance.The characteristics of natural F.longipetiolata community in Qizimei Mountain Natural Reserve were studied.The results showed that F.longipetiolata community in Qizimei mountain contained 91 species,belonging to 68 genera and 43 families.In the level of genera,the north temperate distribution-type elements were the dominant composition,which has 20 genera,accounting for 30.3％ in total genera,following by the tropical and the temperate elements.The analysis of important value showed F.longipetiolata was the main dominant species,and Cyclobalanopsis multinervis,Sinarundinaria nitida and Eurya muricata were the sub-dominant species;The species diversity indexes of community had the same patterns：the herb was the highest,and the shrub was the lowest,except for the richness index.Due to the proportion of F.longipetiolata in Ⅰ and ⅡⅡ classes were less,it was conclude that Fagus longipetiolata natural community is decreasing community with worse natural regeneration.