植物生态学报 ›› 2018, Vol. 42 ›› Issue (5): 562-572.doi: 10.17521/cjpe.2017.0270

• 研究论文 • 上一篇    下一篇

黔中喀斯特木本植物功能性状变异及其适应策略

钟巧连1,2,3,刘立斌1,2,4,许鑫1,2,3,杨勇1,2,3,郭银明1,2,3,许海洋1,2,3,蔡先立1,2,3,倪健1,2,4,*()   

  1. 1 中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550081
    2 中国科学院普定喀斯特生态系统观测研究站, 贵州普定 562100
    3 中国科学院大学, 北京 100049
    4 浙江师范大学化学与生命科学学院, 浙江金华 321004
  • 收稿日期:2017-10-29 修回日期:2018-03-27 出版日期:2018-05-20 发布日期:2018-07-20
  • 通讯作者: 倪健 E-mail:nijian@zjnu.edu.cn
  • 基金资助:
    国家自然科学基金(41471049);国家全球变化重大科学研究计划项目(2013CB956704)

Variations of plant functional traits and adaptive strategy of woody species in a karst forest of central Guizhou Province, southwestern China

ZHONG Qiao-Lian1,2,3,LIU Li-Bin1,2,4,XU Xin1,2,3,YANG Yong1,2,3,GUO Yin-Ming1,2,3,XU Hai-Yang1,2,3,CAI Xian-Li1,2,3,NI Jian1,2,4,*()   

  1. 1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
    2 Puding Karst Ecosystem Research Station, Chinese Academy of Sciences, Puding, Guizhou 562100, China
    3 University of Chinese Academy of Sciences, Beijing 100049, China
    4 College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
  • Received:2017-10-29 Revised:2018-03-27 Online:2018-05-20 Published:2018-07-20
  • Contact: Jian NI E-mail:nijian@zjnu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation(41471049);the National Key Basic Research Program for Global Change(2013CB956704)

摘要:

性状变异反映了植物的生活史对策。该研究以贵州普定县天龙山10种木本植物为对象, 通过分析枝叶和根系9个功能性状的种间与种内变异, 揭示植物对喀斯特生境的适应策略。结果表明: (1) 9个性状变异程度不同, 细根组织密度的种间和种内变异系数最大, 分别达96.47%和51.44%, 小枝干物质含量的种间与种内变异最小, 分别为11.67%和6.83%。(2)种间水平的细根组织密度在不同物种中没有显著的差异, 比根长、叶厚度、叶面积、比叶面积、叶干物质含量、叶组织密度、小枝干物质含量和小枝组织密度均表现出显著的差异。在种内, 比叶面积差异显著, 其他性状差异不显著。(3)绝大多数叶和枝性状间显著相关, 比根长与比叶面积显著负相关, 其他根系性状与枝叶性状相关性不显著。总之, 与同纬度非喀斯特地区植物相比, 普定喀斯特地区植物具有较小的叶面积和比根长度, 较大的叶干物质含量、叶组织密度等一系列有利于减小蒸腾和储存养分的功能性状组合, 这可能是其适应干旱贫瘠的喀斯特环境的主要生态策略。

关键词: 喀斯特森林, 生活型, 生长型, 性状组合, 种内变异, 种间变异

Abstract:
Aims The aims are to characterize key plant functional traits and their interactions of woody species growing in special and harsh karst habitats, and to explore their potential ways in adapting harsh karst habitats.
Methods A comprehensive survey of nine plant functional traits (including above- and below-ground ones) was conducted in a 100 m × 30 m permanent plot in the Tianlongshan Mountain of Puding County, central Guizhou Province, southwestern China in the summer 2016. Five dominant tree species (Carpinus pubescens, Machilus cavaleriei, Itea yunnanensis, Platycarya strobilacea, Lithocarpus confinis), three shrubs (Zanthoxylum ovalifolium, Stachyurus obovatus, Rhamnus heterophylla) and two vines (Rosa cymosa and Dalbergia hancei) in an evergreen and deciduous broadleaved mixed forest were chosen as target species. Nine traits of leaf, stem, branch and root were investigated and measured. Key features of these nine functional traits of ten woody species were numerically characterized. Traits variations among plant species, life form and leaf phenology group were further investigated. Relationships among key functional traits and between above- and below-ground traits were statistically analyzed.
Important findings (1) Nine traits varied in varying degrees. The maximum and minimum coefficient of interspecific variation were the fine root tissue density (FRTD) and twig dry-matter content (TDMC), 96.47% and 11.67%, respectively. Similarly, the largest and smallest coefficients of intraspecific variation were also FRTD and TDMC, 51.44% and 6.83%, respectively; (2) At the interspecific level, among different species FRTD had no significant difference, but other traits including specific root length (SRL), leaf thickness (LT), leaf area (LA), specific leaf area (SLA), leaf dry-matter content (LDMC), leaf tissue density (LTD), TDMC and twig tissue density (TTD) showed significant differences (p < 0.01). At the intraspecific level, however, SLA showed significant difference, and differences of other traits were not significant. (3) There was a significant correlation between most leaf and branch traits, and SRL vs. SLA were negatively correlated. However, there was no significant correlation among other root traits and leaf and twig traits. In a word, compared to the functional traits in tree species of non-karst evergreen broad-leaved forests in the same latitude, karst woody plants in Puding had a series of functional traits, such as smaller LA, SLA and larger LDMC and LTD and so on, which are beneficial to reducing transpiration and storing nutrient. This may be its main ecological strategy for adapting to arid and poor karst environments.

Key words: karst forest, life form, growth form, trait combination, intraspecific variation, interspecific variation