虎伯寮保护区鹅仙洞南亚热带季雨林群落特征

Community Characteristics of South Subtropical Monsoon Forest in Exiandong,Huboliao Conservation Area

采用相邻格子法,对虎伯寮南亚热带季雨林群落物种多样性进行调查,分析该群落物种组成及群落物种多样性。结果表明:该群落林下植被种类和数量丰富,灌木层、草本层和层间植物分层不明显,在调查样地内共有维管植物63科109属178种,乔木层、灌木层和草本层各有48、118和47种。乔木层重要值排名前五的植物为薄叶润楠(Machilus leptophylla)、细枝柃(Eurya loquaiana)、米槠(Castanopsis carlesii)、沉水樟(Cinnamomum micranthum)和红楠(Machilus thunbergii);灌木层重要值前五位的植物为格药柃(Eurya muricata)、细枝柃、黄樟(Cinnamomum porrectum)、菝葜(Smilax china)和毛栲(Castanopsis fordii);草本层重要值累积超过50%的植物为华山姜(Alpinia chinensis)、卷柏(Selaginella tamariscina)、狗脊(Woodwardia japonica)和乌毛蕨(Blechnum orientale);木质藤本种类丰富,数量较多,有菝葜、网脉叶酸藤果(Embelia rudis)、扁担藤(Tetrastigma planicaule)、毛萼青风藤(Sabia limoniacea)等。灌木层物种数量、多样性指数、优势度指数和丰富度指数均居首位;乔木层和草本层物种数相同,但乔木层优势种突出,物种分布不均匀,草本层数量较多,丰富度指数较大。

The species composition and diversity of south subtropical monsoon forest in Exiandong area of Huboliao were investigated by contiguous grid quadrat method.Result showed that varieties and quantity of under-forest vegetation in this community are abundant.There are 63 families,109 genera,178 vascular plant species in surveyed site which tree layer,shrub layer and herb layer are 47,118 and 47 species,respectively.The top five plants with important value in tree layer are Machilus leptophylla,Eurya loquaiana,Castanopsis carlesii,Cinnamomum micranthum and Machilus thunbergia;the top five plants in shrub layer are Eurya muricata,Eurya loquaiana,Cinnamomum porrectum,Smilax china,Castanopsis fordii;important value accumulation more than 50%plants in herb layer are Alpinia chinensis,Selaginella tamariscina,Woodwardia japonica,Blechnum orientale.The species and number are in rich for woody vines,such as Chinaroot greenbrier,Embelia rudis,Tetrastigma planicaule,Sabia limoniacea,and so on.The species number,diversity index,dominance index and richness index of shrub layer top the list.The species number in tree layer and shrub layer is the same,but the dominant species in tree layer were prominent and the species distribution was uneven.The number of vegetation was more and richness index was larger in herb layer.