| 摘要: |
| 以广东省信宜市中部山区不同林龄（3 a 生和 5 a 生）桉树人工林为研究对象，通过样地调查， 统计和分析了桉树林下植被结构特征（种类组成、结构与分布）和物种多样性（Margale 丰富度指数、 Simpson 优势度指数、Shannon-Wiener 指数和 Pielou 均匀度指数）。结果表明：（1）3 a 生桉树林下植被共 记录维管束植物23 科 31 属 33 种，5 a 生桉树林林下植被共记录维管束植物 24 科 32 属 35 种，不同林龄 桉树林下植被结构与分布特征差异较大，乔木幼苗、灌木层和草本层的优势种均明显不同；（2）林龄对 桉树林下植被丰富度影响相对较小，但对优势度和均匀度影响较大；随着林龄的增加，桉树林下灌木层 和草本层植被物种多样性均明显下降，其中灌木层下降幅度大于草本层。总体而言，林龄对林下植被的 种类组成影响相对较小，但对林下植被的结构与分布以及物种多样性有显著影响。 |
| 关键词: 桉树 林下植被 物种多样性 林龄 |
| DOI： |
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| 基金项目:华南农业大学青年科技人才培育专项基金。 |
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| Species Diversity of Understory Vegetation of Eucalyptus Plantation at Different Stand Age |
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Luo Jiexian,Yu Zhengmin,Nie Yuying,Lv Pei and qiuquan
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College of Forestry and Landscape Architecture, South China Agricultural University,College of Forestry and Landscape Architecture, South China Agricultural University,College of Forestry and Landscape Architecture, South China Agricultural University,College of Forestry and Landscape Architecture, South China Agricultural University,College of Forestry and Landscape Architecture, South China Agricultural University
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| Abstract: |
| Based on the ?eld survey, the structure characteristics (species compositions, structure and distribution) and species diversity (Margale richness index, Simpson dominance index, Shannon-Wiener index and Pielou evenness index) of understory vegetation of 3-year-old and 5-year-old Eucalyptus plantation in central mountainous area of Xinyi city, Guangdong province was statistically analyzed. The result shows that: (1) There are 23 families 31 genus 33 species of vascular plants grown under 3-year-old Eucalyptus plantation, the dominant species are Sapium discolor, Evodia lepta, Cunninghamia lanceolata, Hedyotis hedyotidea, Urena lobata, Melastoma candidum, Praxelis clematidea, Dianella ensifolia, Oplismenus compositus; there are 24 families 32 genus 35 species of vascular plants grown under 5-year-old Eucalyptus plantation, the dominant species are Toona ciliata, Engelhardtia roxburghiana, Litsea glutinosa, Rhodomyrtus tomentosa, Ficus hirta, Clerodendrum cyrtophyllum, Oplismenus compositus, Dicranopteris dichotoma, Blechnum orientale. (2) For understory vegetation of Eucalyptus plantation, stand age has a limited effect on its species richness, but obviously affected its species dominance and evenness; with the increase of stand age, species diversity of shrub layer and herb layer under Eucalyptus plantation both decease obviously, and shrub layer shows a greater decrease than herb layer. In general, stand age had limited effect on the species compositions of understory vegetation of Eucalyptus plantation, but obviously affected its structure and distribution and species diversity. |
| Key words: Eucalyptus plantation understory vegetation species diversity stand age |
