生物多样性 ›› 2016, Vol. 24 ›› Issue (3): 262-270.doi: 10.17520/biods.2015200

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亚热带常绿落叶阔叶混交林植物功能性状的种间和种内变异

唐青青1, 黄永涛1, 丁易1, 2, *(), 臧润国1, 2   

  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 南京林业大学南方现代林业协同创新中心, 南京 210037
  • 收稿日期:2015-07-08 接受日期:2016-01-15 出版日期:2016-03-20
  • 通讯作者: 丁易 E-mail:ydingcaf@163.com
  • 基金项目:
    科技基础性工作专项(2013FY111600-2)和公益性行业科研专项(201304308)

Interspecific and intraspecific variation in functional traits of subtropical evergreen and deciduous broad-leaved mixed forests

Qingqing Tang1, Yongtao Huang1, Yi Ding1, 2, *(), Runguo Zang1, 2   

  1. 1 Key Laboratory of Forest Ecology and Environment of State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091
    2 Co-Innovation Center for Sustainable Forestry in Sounthern China, Nanjing Forestry University, Nanjing 210037
  • Received:2015-07-08 Accepted:2016-01-15 Online:2016-03-20
  • Contact: Ding Yi E-mail:ydingcaf@163.com

不同物种间的功能性状差异是自然生态系统中物种共存的基础, 而物种内个体间的性状变异对物种的共存和分布同样具有重要作用。本文以湖北星斗山自然保护区亚热带常绿落叶阔叶混交林内28种主要树种(通过物种多度排序获得, 其中常绿和落叶树种各14种)为研究对象, 探讨不同叶习性树种的4种功能性状(比叶面积、叶干物质含量、叶面积和比茎密度)在种间和种内的差异程度。结果表明: (1)常绿和落叶树种在4种功能性状上均存在显著差异, 常绿树种的比叶面积和叶面积显著低于落叶树种, 但叶干物质含量和比茎密度则显著高于落叶树种; (2)比叶面积的变化主要来源于叶习性(57.49%), 叶面积变化主要来源于种间(66.80%)和种内变异(27.52%), 叶干物质含量的变化主要来源于种间(38.12%)和种内(33.88%)变异, 但比茎密度的变化主要来源于种内变异(51.50%), 其次为种间变异(32.52%); (3)常绿和落叶树种种间水平的性状相关性可能掩盖各功能性状之间的相关性。种内变异能够显著影响群落间的植物功能性状差异, 但不同功能性状的种内变异程度存在差异。

关键词: 功能性状, 变异系数, 种间变异, 种内变异, 常绿落叶植物, 叶习性

Interspecific variation in plant functional traits is the basis of species coexistence in natural ecosystems. However, intraspecific variation is also extremely important for community assemblage and distribution. Here, we sampled 28 dominant tree species with two different leaf forms (14 evergreen species and 14 deciduous species, respectively, obtained by species abundance ranking) in a subtropical evergreen and deciduous broad-leaved mixed forest in Hubei Xingdoushan National Nature Reserve. Differences in interspecific and intraspecific variations of four functional traits were explored, including specific leaf area (SLA), leaf dry matter content (LDMC), leaf area (LA), and stem specific density (SSD). Results demonstrated that: (1) There were significant differences in the four functional traits between evergreen and deciduous trees. The SLA and LA of evergreen species were significantly lower than those of deciduous species, but LDMC and SSD showed the opposite pattern; (2) Leaf habit was the main source (57.49%) for variation of SLA. Interspecific variability (66.80%) played an important role in LA than intraspecific variability (27.52%). LDMC variation was contributed relatively evenly by interspecific (38.12%) and intraspecific (33.88%) variability. On the contrary, the variation in SSD was explained more by intraspecific (51.50%) than interspecific (32.52%) variability; (3) Correlations of different functional traits on intraspecific levels of both evergreen and deciduous trees were higher than those found for interspecific levels. Our results showed that the variation of functional traits between communities could be influenced significantly by intraspecific variability. However, there were differences in the degree of variation of different functional traits.

Key words: functional trait, coefficient of variation, interspecific variability, intraspecific variability, evergreen and deciduous plants, leaf habit

图1

星斗山常绿落叶阔叶混交林常绿和落叶树种4个功能性状箱式图。圆点代表植物个体性状值。落叶树种: 1-14; 常绿树种: 15-28。"

图2

星斗山常绿落叶阔叶混交林常绿和落叶树种不同叶习性的植物功能性状变异系数。圆圈代表物种平均性状值, 柱状图代表物种间的变异系数, 箱式图代表物种个体之间的变异系数。"

表1

叶习性、种间及种内对不同植物功能性状变异的贡献"

性状
Trait
贡献百分比 Percentage of contribution (%)
叶习性
Leaf habit
种间
Interspecific
种内
Intraspecific
随机误差
Random error
比叶面积 Specific leaf area
叶干物质含量 Leaf dry matter content
叶面积 Lamina area
比茎密度 Stem specific density
平均值 Mean
57.49
21.92
0.33
7.52
21.81
12.47
38.12
66.80
32.52
37.48
25.51
33.88
27.52
51.50
34.60
4.53
6.08
5.35
8.46
6.11

表2

常绿和落叶树种种间和种内水平性状相关性"

性状
Trait
种间
Interspecific level
种内(胸径作为协变量的偏相关系数)
Intraspecific (Partial correlation rates of DBH as covariate)
SLA LDMC LA SSD SLA LDMC LA SSD
落叶树种 Deciduous plant
比叶面积 Specific leaf area (SLA) 1.00 1.00
叶干物质含量 Leaf dry matter content (LDMC) -0.50 1.00 -0.40*** (-0.40***) 1.00
叶面积 Lamina area (LA) 0.14 -0.57* 1.00 0.03 (0.03) -0.36*** (-0.35**) 1.00
比茎密度 Stem specific density (SSD) -0.06 0.45 -0.42 1.00 -0.03 (-0.03) 0.26*** (0.22**) -0.23*** (-0.18***) 1.00
常绿树种 Evergreen plant
比叶面积 SLA 1.00 1.00
叶干物质含量 LDMC -0.54* 1.00 -0.49*** (-0.48***) 1.00
叶面积 LA -0.25 -0.09 1.00 -0.14*** (-0.10*) -0.06 (-0.02**) 1.00
比茎密度 SSD 0.27 -0.27 0.09 1.00 0.03 (0.04) 0.04 (-0.04) -0.05 (0.01) 1.00
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