粤北八宝山森林群落的组成和结构特征

FLORISTIC COMPOSITION AND STRUCTURAL CHARACTERISTICS OF FOREST COMMUNITIES IN BABAOSHAN NATURE RESERVE ,NORTH GUANGDONG

在线路调查和样方凋查材料的基础上分析了粤北八宝山自然保护区森林群落的组成和结构特征。八宝山森林群落外貌终年常绿，群落的区系组成以亚热带的科属为主，优势科为壳斗科、山茶科、樟科、木兰科、金缕梅科、安息香科、五列本科、杜英科、杜鹃花科、松科、冬青科以及交让本科。优势种亦大部分由这些科的种类组成。群落中胸径≥２ｃｍ的个体密度为３３７７株／ｈｍ２，平均距离为１．６２ｍ。群落的垂直分化比较明显，乔木层一般可分为２—３亚层。第１亚层高１６—２２ｍ；第２亚层高１０—１６ｍ；第３亚层高５—１０ｍ。群落缺乏板根现象和大型木质藤本，附生植物也不发达，表现出中亚热带森林的特色。

Based on the data obtained from sampled surveys in the field work,floristic composition aid structural characteristics of forest communities in Babaoshan Nature Reserve is analyzed.Forest communities in this region are dominated by tropical and subtropical families,with an evergreen physiognomy.The dominant families are Fagaceae,Theaceae,Lauraceae,Magnoliaceae,Hamamelidaceae,Styracaceae, Pentaphylacaceae,Elaeocarpaceae,Ericaceae,Pinaceae,Aquifoliaceae and Daphniphyllaceae, The density of individuals(DBH≥2cm) in the forest is 3377/hm2,and average diStance is 1.62 m.Vertical stratification of the communities is relatively conspicuous,2 to 3 sub-layers in the tree-layer can be easily distinguished,with the height of 16～22m in the first sub-layer,10-10m in the aeeond sub-layer and 5-10min the third sub-layer. The forest lacks large buttresses and woody mega-lianas which are typical of tropical rain forest and eved even lower sub-troplcal evergreen broadleaved forest.And epiphytes are infrequent.In this respect,the forest of Babaoshan Nature Reserve shows seine features of a tempoate forest.