珍稀濒危植物长苞铁杉群落的植物生活型及叶特征分析

根据Raunkiaer的分类系统,对福建省天宝岩国家级自然保护区长苞铁杉(Tsuga longibracteata Cheng)群落的维管植物生活型及叶特征进行了分析,结果表明该群落以高位芽植物占优势,且以小、矮高位芽植物占优势,并有较大比例的藤本高位芽植物.叶级以中型叶植物所占比率最大,为51.5%,小型叶、大型叶、微型叶和细型叶分别占37.7%、5.4%、3.1%和2.3%;叶型以单叶为主,占92.9%;叶质以厚革质叶和革质叶所占比率最大,为66.4%,纸质叶占32.1%,薄叶占1.4%;全缘叶占43.6%.此外,对群落中植物生活型、叶型与层次结构、外貌的关系进行了分析.群落内阴性植物所占比例较大,为总种数的49.3%,并伴有一定数量的阳性植物.

Analysis on characteristics of plant life-form and leaf in rare and endangered plant Tsuga longibracteata community

The plant life-form and leaf characteristics of 140 vascular plants in Tsuga longibracteata Cheng community in the Tianbaoyan National Nature Reserve in Fujian Province were analyzed according to Raunkiaer system. Phanerophytes occupied a dominant position in the community, microphanerophytes and nanophanerophytes had the highest percentage and lianoidphanerophytes followed them. The dominant leaf size was mesophyll whose percentage was 51.5%,followed by microphyll (37.7%), macrophyll (5.4%),leptophyll (3.1%) and nanophyll (2.3%). Simple leaves were dominant in leaf form and the percentage of those was 92.9%. The dominant leaf characters were thick coriaceous and coriaceous leaves (66.4%), followed by papery leaves (32.1%), thin leaves (1.4%). The leaf edges of 140 plants were investigated and the percentage of entire leaf plants was 43.6%. The relationships between life-form, leaf form and stratification, structure of the community were analyzed. The community had the highest proportion of shade tolerant plants which account for 49.3% of the total species and had some heliophilous plants.