摘要
巨柏(Cupressus gigantea)为雅鲁藏布江地区分布的特有种,属国家一级保护植物。本文通过在米林-朗县雅鲁藏布江河谷13个面积为1 000 m2的巨柏林样地调查资料,按照近河谷和远河谷山坡的地理分布差异,统计分析了巨柏的种群天然更新特征;通过对群落的组成与结构的分析,初步阐述了巨柏群落的物种组成和结构特征。结果表明,雅鲁藏布江巨柏的更新情况比较差,种群年龄结构不稳定,整体上呈现了明显的种群衰退现象。通过种群的年龄结构分析,反映出了巨柏种群的失衡事件主要发生在最近几十年内,即0.6 m高度10 cm树径范围。巨柏林内物种组成结构单一,乔木层为单一巨柏种,灌木层和草本层的优势种数较少。鉴于巨柏种群环境沙化影响加剧、天然更新能力下降等因素,种群的延续面临较大威胁,需进一步加强该种群的保护和研究。
Cupressus gigantea is a peculiar species distributed on the riverside of the Yarlung Zanbo River,and is one of the first-class protective plants in China. The Investigation data of 13 sample plots （whose size covers an area of 1 000 m^2 ） in the valley of ghe Yarlung Zanbo River from Mainling to Lanxian have been obtained according to different geographical distributions divided into near and far areas away from the river, and the natural regeneration characteristics of C. gigante population has been recorded and analyzed. By analyzing the component and structure of the community, the characteristics of them are preliminarily expounded. The results have shown that the natural regeneration ability of C. gigantea is weak, the age structure of its population is unstable, and the population has degenerated in general. The imbalance of the population has occurred in nearly decades according to its age structure. The composite structure of the community is simple . Because of the increasing desertification of the habitat of C. gigantea and the decreased natural regeneration ability, much more protections and studies need to be carried out in the future.
出处
《四川林业科技》
2010年第1期77-80,共4页
Journal of Sichuan Forestry Science and Technology
基金
西藏工布自然保护区本底调查
关键词
巨柏
种群更新
群落特征
西藏
Cupressus gigantea, Population regeneration, Community characteristic, Tibet
