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Plant Diversity ›› 2011, Vol. 33 ›› Issue (4): 433-442.DOI: 10.3724/SP.J.1143.2011.10250

• 研究论文 • 上一篇    下一篇

怒江中游西藏境内干旱河谷荒漠植被特征

 庄翠珍, 杜凡, 刘宁, 张辉, 陈勇, 杜小浪   

  1. 西南林业大学林学院,云南 昆明650224
  • 收稿日期:2010-12-24 出版日期:2011-08-25 发布日期:2011-06-07
  • 基金资助:

    西南山地森林资源保育与利用省部共建教育部重点实验室资助

Vegetative Characteristics in the Dry Valley of the Middle Reaches of Nujiang River in Tibet, China

 ZHUANG  Cui-Zhen, DU  Fan, LIU  Ning, ZHANG  Hui, CHEN  Yong, DU  Xiao-Lang   

  1. Faculty of Forestry, Southwest Forestry University, Kunming 650224, China
  • Received:2010-12-24 Online:2011-08-25 Published:2011-06-07

摘要:

基于实地调查资料,对西藏境内怒江中游河谷的特殊荒漠型植被进行了研究。结果表明:(1)22个样方中有85种维管植物,其种子植物属的分布区类型以泛热带分布为主,占21.6%;种以中国特有分布中的西南特有成分为主,占53.2%;(2)生活型谱以矮高位芽植物为主,占41.2%,地面芽植物占40.0%;(3)采用Raunkiaer频度分析,出现在10个以上样方中的物种有白刺花、垫状卷柏、芸香草和阔盖中国蕨等,频度分别是68.2%、50.0%、50.0%、45.5%;(4)根据该河谷区域的气候特点、干旱程度、群落的生态外貌特征和生活型等,并结合《中国植被》对灌丛和荒漠的划分,认为该河谷区域的植被盖度极低,不属于灌丛类型,而是非地带性的干旱河谷型荒漠植被。

关键词: 怒江中游, 荒漠植被, 干旱河谷

Abstract:

Based on statistical analysis of the characteristics of the vegetation in the dry valley in middle reaches of the Nujiang River in Tibet, it is revealed that: (1) There are 85 vascular plant species belonging to 55 genera in 34 families, including 4 ferns belonging to 4 genera in 4 families; 1 species of Gymnosperm; 79 species of Angiosperm belonging to 50 genera in 29 families. 13 arealtypes of the seed plants genera can be recognized, but mainly Pantropic (21.6%). 45 (57.0% of the total) species endemic to China are found, of which 42 (53.2%) species are endemic to SW China and 3 (3.8%) species endemic in Tibet. (2) Four main lifeforms, the Nanophanerophyte, the Hemicryptophyte, the Chamaephyte and the Therophyte, can be recognized, of which the Nanophanerophyte is highest, occupying 41. 2% and the Hemicryptophyte accounting for 40% of the total. (3) Based on the Raunkiaer frequency analysis, Sophora davidii, Sellaginella pulvinata, Cymbopogon distans, Sinopteris albofusca occurring in over 10 transect plots are among the highest frequency degrees with frequent percentage as 68.2%, 50.0%, 50.0%, 45.5%, respectively. (4) Based on the climate features and severity of drought, the characteristics of the ecological status, the living forms of communities with very low degree of plant coverage, the vegetation belongs to riparian arid desert type.

 

Key words:  Middle reaches of Nujiang River, Wasteland vegetation, Dry valley

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