生物多样性 ›› 2016, Vol. 24 ›› Issue (6): 617-628.DOI: 10.17520/biods.2016054

• • 上一篇    下一篇

物种多度和径级尺度对于评价群落系统发育结构的影响: 以尖峰岭热带山地雨林为例

许格希1, 史作民1,2,,A;*(), 唐敬超1, 许涵3, 杨怀4, 刘世荣1, 李意德3, 林明献4   

  1. 1 中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室, 北京 100091
    2 南京林业大学南方森林可持续经营创新中心, 南京 210037
    3 中国林业科学研究院热带林业研究所, 广州 510520
    4 中国林业科学研究院热带林业研究所试验站, 海南乐东 572542
  • 收稿日期:2016-02-25 接受日期:2016-06-05 出版日期:2016-06-20 发布日期:2016-06-20
  • 通讯作者: 史作民
  • 基金资助:
    国家自然科学基金(31290223和31570240)

Effects of species abundance and size classes on assessing community phylogenetic structure: a case study in Jianfengling tropical montane rainforest

Gexi Xu1, Zuomin Shi1,2,*(), Jingchao Tang1, Han Xu3, Huai Yang4, Shirong Liu1, Yide Li3, Mingxian Lin4   

  1. 1 Key Laboratory on Forest Ecology and Environmental Sciences, State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091
    2 Co-innovation Centre for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037
    3 Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520
    4 Experimental Station of Research Institute of Tropical Forestry, Chinese Academy of Forestry, Ledong, Hainan 572542
  • Received:2016-02-25 Accepted:2016-06-05 Online:2016-06-20 Published:2016-06-20
  • Contact: Shi Zuomin

摘要:

研究不同径级尺度群落系统发育多样性有助于了解不同年龄模式下物种的亲缘关系及其群落系统发育结构; 但是关于物种多度对群落系统发育结构影响的研究较少。以海南尖峰岭热带山地雨林群落为例, 首先在不同径级尺度比较物种多度加权与否分别对4个广泛采用的系统发育指数的影响, 继而利用其中2个经过标准化处理的系统发育多样性指数: 净种间亲缘关系指数(net relatedness index, NRI)和净最近种间亲缘关系指数(nearest taxon index, NTI), 结合群落的生境类型来量度不同局域生境条件下不同径级尺度木本植物系统发育关系。结果发现: (1)未考虑物种多度加权的系统发育平均成对距离(mean pairwise distance, MPD)指数比考虑物种多度加权的MPD指数显著地高估了群落整体系统发育多样性, 且这种现象在小径级尺度(1 cm≤DBH<5 cm)最为明显。因此, 在森林监测样地中对于中、小径级群落系统发育结构研究中建议考虑物种多度信息。(2) 从群落组成整体系统发育结构来看, 尖峰岭热带山地雨林在几乎所有径级尺度和生境下均倾向于系统发育发散, 且随着径级的递增发散程度趋于明显(NRI<0)。(3)从群落组成局部系统发育结构来看, 尖峰岭热带山地雨林在中、小径级倾向于系统发育聚集(NTI>0), 而在大径级(DBH≥15 cm)则倾向于系统发育发散(NTI<0)。总之, 研究群落系统发育结构时应考虑物种多度的影响以及径级尺度效应。

关键词: 热带山地雨林, 系统发育多样性, 物种多度加权, 径级, 生境异质性, 尖峰岭

Abstract

Studying community phylogenetic diversity within forest stands of different diameter classes (i.e. size classes) is helpful for understanding relationships among species at different ages while at the same time community phylogenetic structure. However, little research has been focused on the influence of species abundance on phylogenetic structure of community. This study was conducted in the Jianfengling tropical montane rainforest on Hainan Island. First, we assessed the impact of species abundance on four widely used phylogenetic diversity indices at different size classes. Next, two of the indices (i.e. net relatedness index, NRI and nearest taxon index, NTI) were standardized and used to quantify phylogenetic relatedness of woody plants at different size classes across a series of local habitat types. The results showed that: (1) The unweighted MPD (mean pairwise distance) index significantly overestimated phylogenetic diversity relative to MPD weighted according to species abundance. This overestimation when using unweighted MPD was greatest for small trees and shrubs (1 cm≤DBH<5 cm). Therefore species abundance information should be taken into consideration in the study of phylogenetic structure of community when most of the trees and shrubs are young and small. (2) The community phylogenetic structure was most likely overdispersed among almost all size classes and habitats of the Jianfengling tropical montane rainforest (NRI<0). This phylogenetic overdispersion increased as size class increased. (3) The partial community phylogenetic structure tended to be clustered at middle and small size classes (NTI>0). However, this pattern continued to show overdispersion within communities made up of large trees (DBH≥15 cm) (NTI<0). In summary, studies assessing the influences of species abundance and size classes on community phylogenetic structure are required.

Key words: tropical montane rainforest, phylogenetic diversity, weighted species abundance, size classes, habitat heterogeneity, Jianfengling