| 摘要: |
| 以桉树和乡土阔叶树的混交林为研究对象，采用单因素方差分析、相关关系分析等统计方法，分析不同桉树密度下桉阔混交林碳密度的差异性变化及其影响因子。结果表明：（1）以 400 m2样方作为基本单位进行统计，低桉树密度林的株数最高，高桉树密度林的立木材积、碳储量、碳密度最大；（2）不同桉树密度林分的株数没有显著差异，立木材积、碳储量、碳密度均有显著差异；（3）桉阔林株数的径级分布呈倒“J”型，径级为 2~8 cm 时株数最高；立木材积、碳储量、碳密度的径级分布呈单峰型，径级为 14~20 cm 时 3 个指标的数值最高；中径级（12~22 cm）是林分碳密度的主要贡献部分，贡献了总碳密度的 66.83%；高桉树密度林在中、大径级（6 cm ≤ DBH）的碳密度明显高于中、低桉树密度林；（4）碳密度与物种多样性的关系较弱，碳密度与物种丰富度、香农 - 维纳指数、均匀度指数、优势度指数均无显著相关性；碳密度与林分结构因子关系密切，与其中的人工植被、桉树的林分结构因子均有显著正相关关系。桉阔林中桉树能明显提高林分的碳密度，增强森林碳汇能力。 |
| 关键词: 桉树密度 桉阔林 碳密度 物种多样性 林分结构因子 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技创新项目（2018KJCX002） |
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| Carbon Density of Tree Layer in Eucalyptus-broadleaved Forest and Influencing Factors in Western Guangdong |
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xu mingfeng,SU Yongxin,Gong Yiguang,WANG Feng,HE Chunmei,张少杰
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1.Guangdong Academy of Forestry;2.Guangdong Pearl River Estuary National Nature Reserve Administration of Chinese White Dolphin;3.Deqing Forest Farm of Guangdong Province
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| Abstract: |
| In this paper, eucalyptus and native broadleaved mixed forests were used as the research object, and statistical methods such as one-way ANOVA and correlation analysis were used to reveal the differences in carbon density and influencing factors of eucalyptus and native broadleaved mixed forests under different eucalyptus densities. The results showed that: (1) the number of stems in the low eucalyptus density forest were the highest, while the standing stock, carbon storage and carbon density in the high eucalyptus density forest were the highest using 400 m2 plot as the basic sheet for statistics. (2) There was no signi?cant difference in the number of stems in different eucalyptus density forests, but there were significant differences in stand stock, carbon storage and carbon density. (3) The DBH class distribution of eucalyptus-broadleaved forest was inverted “J” type, and the number of stems reached the highest when the DBH class was 2-8 cm. The DBH class distribution of stand stock, carbon storage and carbon density were unimodal, and the values of the three indexes were the highest when the DBH class was 14-20 cm. The medium DBH class (12-22 cm) was the main contribution to the stand carbon density, contributing 66.83% of the total carbon density. The carbon density in the medium and large diameter (6 cm ≤ DBH) forests of high eucalyptus density were signi?cantly higher than that in the medium and low eucalyptus density forests. (4) There was no signi?cant correlation between carbon density and species
richness, Shannon-Wiener index, evenness index and Berger-Parker dominance. Carbon density was closely
related to the stand structure factors, and was positively correlated with the stand structure factors of arti?cial
vegetation and eucalyptus. Eucalyptus in eucalyptus-broadleaved forest can obviously improve the carbon density
of stand and enhance the forest carbon sink capacity. |
| Key words: eucalyptus density eucalyptus-broadleaved forest carbon density species diversity stand structure factor |
