摘要
灌丛是陆地生态系统中最重要的自然植被类型之一,在植被演替、生物多样性保护和维持生态平衡等方面具有重要作用。本文基于2012年的样地资料,对湖南大围山杜鹃(Rhododendron simsii)灌丛的物种组成和群落结构进行了分析。结果表明:群落内共有维管束植物58种,隶属于36科50属,其中木本植物19种,草本植物39种,缺乏木质藤本;区系以温带性质为主,兼受热带亚热带区系的强烈影响;群落外貌矮平,灌木层个体集中在1–2 m高度级;植被分类上,该群落归属于山地中生落叶阔叶灌丛,隶属于温性落叶阔叶灌丛群系组;生活型以地面芽和高位芽植物为主,反映了亚热带中山山顶温凉湿润的气候特点;群落各层次优势种明显,具有较高的稳定性和均匀性;高度级和基径级分析表明群落内中等大小个体具有保守的生活史策略,优势种杜鹃为远期衰退种群。综合分析结果表明,该杜鹃灌丛尚处于群落演替的中期或前中期,最终将演替为亚热带中山常绿落叶阔叶混交林或常绿阔叶林。
As one of the most important natural vegetation types of terrestrial ecosystems, shrublands play an important role in vegetation succession, biodiversity conservation and ecological balance. Based on the data collected in six Rhododendron simsii shrubland permanent plots established in the Dawei Mountain Nature Reserve in Liuyang, Hunan Province, China in 2012, we analyzed species composition and community structure. The results were as follows： There were 36 families, 50 genera and 58 vascular plant species in- cluding 19 woody species and 39 herbaceous species in the community without woody vine species. Floristic composition was dominated by the temperate elements and affected strongly by tropical and subtropical flora. The physiognomy was short and the vertical structure of the community was distinct with obvious shrub and herb layers. Most individuals of shrub species were concentrated in the 1-2 m height class. The shrubland was a type of the montane mesophilius deciduous broad-leaved thickets, belonging to the temperate decidu ous broad-leaved thicket formation group. The life-form spectrum reflected the cold climatic conditions due to the high percentage of phaenerophytes and hemicryptophytes in the community. There were obvious dominant species in the community that had a high stability and uniformity. The analysis of height and base area classes of the shrub layer indicated mid-size individuals had conservative life strategies in this community, and R. sirnsii was a future declining population. Generally, the results suggest that R. simsii shrubland is at an early or middle successional stage and will develop into a subtropical montane evergreen and deciduous broad-leaved mixed forest or evergreen broad-leaved forest.
出处
《生物多样性》
CAS
CSCD
北大核心
2015年第6期815-823,共9页
Biodiversity Science
基金
中国科学院战略性先导科技专项--应对气候变化的碳收支认证及相关问题(XDA05050302)
中国科学院植物研究所植被与环境变化国家重点实验室开放课题(2014kf02)
湖南省教育厅优秀青年项目(14B194)
关键词
中山山地灌丛
温性落叶阔叶灌丛
衰退种群
演替前期
亚热带
montane shrubland, temperate deciduous broad-leaved shrubland, declining population, earlysuccessional stage, subtropics
