生物多样性 ›› 2011, Vol. 19 ›› Issue (2): 127-133.doi: 10.3724/SP.J.1003.2011.07290

所属专题: 中国的森林生物多样性监测

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鼎湖山南亚热带常绿阔叶林20公顷样地幼苗的分布

宾粤1, 2, 叶万辉1*, 曹洪麟1, 黄忠良1, 练琚愉1   

  1. 1中国科学院华南植物园植物资源保育和持续利用重点实验室, 广州 510650
    2中国科学院研究生院, 北京 100049
  • 收稿日期:2009-12-24 修回日期:2011-01-18 出版日期:2011-03-21
  • 通讯作者: 叶万辉 E-mail:why@scbg.ac.cn

Seedling distribution in a subtropical evergreen broad-leaved forest plot in the Dinghu Mountain

Yue Bin1, 2, Wanhui Ye1*, Honglin Cao1, Zhongliang Huang1, Juyu Lian1   

  1. 1Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650

    2Graduate University of the Chinese Academy of Sciences, Beijing 100049
  • Received:2009-12-24 Revised:2011-01-18 Online:2011-03-21
  • Contact: Wanhui Ye E-mail:why@scbg.ac.cn

为了解鼎湖山常绿阔叶林树木幼苗的组成、分布及高度结构, 在鼎湖山20 ha动态监测样地(简称DHS)内布置了149个种子雨收集器, 并在周围设置了幼苗小样方。2008年3月完成了幼苗调查, 共调查到2,632株。采用多元线性回归方法分析了9个树种幼苗多度与6个变量之间的关系。这6个变量包括种子雨收集器10 m内DBH≥1 cm同种个体的个体数、胸高断面积之和, 以及地形的凹凸度、坡度、坡向和海拔。结果表明影响幼苗多度的因素随树种不同而不同。其中3个树种的幼苗多度只与地形变量有关, 4个树种幼苗多度同时受到地形和同种个体多度的影响, 1个树种的幼苗多度只与同种个体有关, 1个树种幼苗多度与所有变量的关系都不显著。除谷木(Memecylon ligustrifolium)外, 10 m范围内同种个体的多度和胸高断面积的偏回归系数一旦显著皆为正值, 即幼苗多度随同种个体数或同种胸高断面积增大而增大。本研究为扩散限制和生态位理论提供了间接的证据。

To explore the composition, distribution, and height structure of tree seedlings in an evergreen broad-leaved forest in the Dinghu Mountain, 149 seed traps were set up, surrounded by seedling plots, in a 20-ha dynamic plot. Seedling plots were censused in March, 2008 and a total of 2,632 seedlings were recorded. Multiple linear regression was used to analyze the relationship between the abundance of seedlings for nine species and six variables, including the number of conspecifics within 10 m away from a seed trap, the sum of conspecific basal area within 10 m away from a seed trap, and convexity, slope, aspect, and elevation. Factors influencing seedling abundance differed among species. Three species were related only to topographic variables, one species was related only to the conspecifc variables, four species were influenced by both topography and conspecific abundance, and one species was influenced by neither. For all species except Memecylon ligustrifolium, significant partial regression coefficients were positive, indicating that seedling abundance increases with the number or the basal area of conspecifics within 10 m away from a seed trap. This research provides indirect evidence for dispersal limitation and niche theory.

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