摘要
[目的]研究浙江清凉峰自然保护区珍稀濒危植物紫茎(Stewartia sinensis)群落的结构特征。[方法]基于取样代表性的原则,选择可覆盖乔木层紫茎株数占92%地段的样地20 m×30 m,分析群落物种组成、区系成分特征、垂直结构和径级结构。[结果]群落样地共有维管束植物29科38属44种,属和种的数量占优势的科为山茶科(Theaceae)、樟科(Lauraceae)和壳斗科(Fagaceae);种子植物属的一级地理区系成分共含7个类型,其中温带和热带分布分别占总属数的52.78%和41.66%,具有温带至热带的过渡性特征和亚热带性质;群落垂直结构可分为乔木层、灌木层和草本层,其中乔木层的优势种为短柄枹栎(Quercus glandulifera)、黄山松(Pinus taiwanensis)、雷公鹅耳枥(Carpinus viminea)和紫茎(Stewartia sinensis),灌木层的优势种为杜鹃(Rhododendron simsii)、吴茱萸叶五加(Acanthopanax evodiaefolius)和黄丹木姜子(Litsea elongata),草本层的优势种为淡竹叶(Lophatherum gracile);群落样地乔、灌、草层次的物种多样性表现为乔木层>草本层>灌木层,而盖度表现为乔木层>灌木层>草本层,草本层呈现稀疏的基本特征;清凉峰紫茎种群以乔木层大径级个体占据绝对优势地位,仅有2株种子更新的紫茎幼树,状况严重不良,因此清凉峰紫茎种群结构属于典型的衰退型。[结论]群落乔木层紫茎大径级植株数量远多于紫茎幼树和幼苗的数量,紫茎天然更新状况极差,其种群径级结构类型属于严重的衰退类型。
[Objective]To study the structural characteristics of the rare and endangered plant Stewartia sinensis community in Qingliangfeng Nature Reserve of Zhejiang Province.[Method]Based on the principle of sampling representativeness,20 m×30 m plot with 92%of S.sinensis trees was selected,the species composition,floristic composition,vertical structure and diameter class structure of the community were preliminarily analyzed.[Result]The results showed that there were 44 species of vascular plants belonging to 38 genera and 29 families in the sample plots.Theaceae,Lauraceae and Fagaceae were the dominant families;there were 7 types in the first grade flora of seed plants,of which temperate and tropical distribution account for 52.78%and 41.66%of the total genera respectively;the vertical structure of the community can be divided into tree layer,shrub layer and herb layer.The dominant species in tree layer were Quercus glandulifera,Pinus taiwanensis,Carpinus viminea and S.sinensis.The dominant species in shrub layer were Rhododendron simsii,Acanthopanax evodiaefolius and Litsea elongata,Lophatherum gracile was dominant species in herb layer;the order of species diversity was tree layer>herb layer>shrub layer,and the order of coverage was tree layer>shrub layer>herb layer;the S.sinensis population in Qingliangfeng was dominated by individuals with large diameter class in tree layer,there were only 2 young S.sinensis trees with seed regeneration,and the seed regeneration was seriously poor.Therefore,the population structure of S.sinensis in Qingliangfeng was a typical decline type.[Conclusion]In the tree layer of the S.sinensis community,the number of large diameter plants of S.sinensis was much more than that of young purple stem trees and seedlings.The natural regeneration of S.sinensis was very poor,and its population size structure belongs to a serious decline type.
作者
张婷宇
张明如
万琦
李清香
蔡益杭
赵楠楠
ZHANG Ting-yu;ZHANG Ming-ru;WAN Qi(College of Landscape Architecture,Zhejiang A&F University,Hangzhou,Zhejiang 311300)
出处
《安徽农业科学》
CAS
2022年第8期104-108,共5页
Journal of Anhui Agricultural Sciences
基金
浙江省自然科学基金一般项目(LY18C160002)
国家自然科学基金面上项目(31570611)。
关键词
清凉峰
紫茎
群落结构
物种多样性
径级结构
Qingliangfeng
Stewartia sinensis
Community structure
Species diversity
Diameter class structure
