| 摘要: |
| 为探究不同混交比例的桉树 Eucalyptus robusta、 红锥 Castanopsis hystrx 混交林对土壤肥力和林
下植被多样性的影响, 以广东省廉江市石岭林场 4 种混交比例的桉树—红锥混交林 (桉树为华桉一号,
红锥为当年生盆栽实生苗) 为研究对象, 通过野外调查、 取样、 分析以及综合比较, 对不同混交比例下
的桉树—红锥混交林的土壤理化性质、 林下植被组成和植物多样性进行分析。 结果表明, 桉树—红锥 5 ∶
1 混交林林下灌木和草本植物最多, 1 ∶ 1 混交林林下灌木物种组成最少, 3 ∶ 3 混交林林下草本物种组成
最少。 4 种桉树—红锥混交林林下植被 Patrick 丰富度指数存在显著差异 (P<0. 05), 表现为 5 ∶ 1 混交林
显著高于 3 ∶ 3 混交林。 3 ∶ 1 混交林林地的土壤最大持水量最大, 其次为 5 ∶ 1 混交林; 3 ∶ 1 混交林的土
壤最大持水量在 0~20 cm, 20~40 cm, 40~60 cm, 3 个土层均显著高于 1 ∶ 1 混交林, 在 20 ~ 60 cm 土层
均显著高于 3 ∶ 3 混交林; 5 ∶ 1 混交林林地的最大持水量仅在 0 ~ 20 cm 土层显著高于 1 ∶ 1 混交林, 在
20~40 cm 土层显著高于 3 ∶ 3 混交林。 桉树—红锥混交林林下植被的 Simpson 多样性指数在 5 ∶ 1 混交林
和 1 ∶ 1 混交林与全磷含量显著负相关; Shannon-Wiener 变化度指数在 3 ∶ 3 混交林与全磷含量显著负相
关, 在 1 ∶ 1 混交林与全磷含量显著负相关; Patrick 丰富度指数在 3 ∶ 3 混交林与土壤非毛管孔隙度显著正
相关, 在 3 ∶ 3 混交林与全氮含量显著负相关; Pielou 均匀度指数在 3 ∶ 1 混交林与土壤非毛管孔隙度和土
壤通气度均显著负相关, 在 5 ∶ 1 混交林与与全磷含量显著正相关。 综上所述, 5 ∶ 1 混交比例更适合林下
植物的生长, 但 1 ∶ 1 的混交比例更适合土壤肥力的保存。 |
| 关键词: 林下植被 土壤肥力 混交 桉树 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技创新项目 (2023KJCX021), 国家重点研发计划项目 (2016YFD0600505)。 |
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| Effects of Different Mixed Ratios of Eucalyptus robusta-Castanopsis hystrx on Understory Vegetation and Soil Fertility |
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Zhu Qi1, Deng Haiyan2, Ma Anqi1, Shen Linlin3, Ding Xiaogang4, Mo Xiaoyong5
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1.College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, Guangdong, China 510642 2. Guangdong Academy of Forestry, Guangzhou 510520, China;2.Guangdong Provincial Institute of Forestry Survey and Planning, Guangzhou;3.College of Forestry and Landscape Architecture, South China Agricultural University,;4.Guangdong Academy of Forestry;5.College of Forestry and Landscape Architecture, South China Agricultural University
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| Abstract: |
| In order to investigate the effects of different mixed proportions of Eucalyptus robusta and Castanopsis hystrx mixed forests on soil fertility and understory vegetation diversity, four different proportions of eucalyptus and red cone mixed forests (E. robusta-C. hystrx is a potted seedling of the same year) in Shiling Forest Farm, Lianjiang city, Guangdong province were selected as the research objects. Through field investigation, sampling, analysis, and comprehensive comparison, the soil physicochemical properties of E. robusta
and red cone mixed forests under different mixed proportions were studied to analyze the composition of understory vegetation and plant diversity. The results showed that the understory shrubs and herbaceous plants were
the most abundant in the 5 ∶ 1 mixed forest of E. robusta, the understory shrub species were the least abundant in
the 1 ∶ 1 mixed forest, and the understory herbaceous species were the least abundant in the 3 ∶ 3 mixed forest.
There was a significant difference in the Patrick richness index of understory vegetation among the four types of
E. robusta mixed forests (P<0. 05), with the 5 ∶ 1 mixed forest being significantly higher than the 3 ∶ 3 mixed
forest. The maximum soil moisture capacity of the 3 ∶ 1 mixed forest is the highest, followed by the 5 ∶ 1
mixed forest. The maximum soil moisture capacity of the 3 ∶ 1 mixed forest is significantly higher in the 0-20
cm, 20-40 cm, and 40-60 cm soil layers than in the 1 ∶ 1 mixed forest, and significantly higher in the 20-60
cm soil layer than in the 3 ∶ 3 mixed forests. The maximum water holding capacity of the 5 ∶ 1 mixed forest is
significantly higher in the 0-20 cm soil layer than in the 1 ∶ 1 mixed forest, and significantly higher in the 20-
40 cm soil layer than in the 3 ∶ 3 mixed forests. The Simpson diversity index of understory vegetation in
E. robusta mixed forest is significantly negatively correlated with total phosphorus content in 5 ∶ 1 mixed forest
and 1 ∶ 1 mixed forest. The Shannon Wiener index of variation is significantly negatively correlated with total
phosphorus content in a 3 ∶ 3 mixed forest, and significantly negatively correlated with total phosphorus content
in a 1 ∶ 1 mixed forest. The Patrick richness index is significantly positively correlated with soil noncapillary porosity in a 3 ∶ 3 mixed forest, and significantly negatively correlated with total nitrogen content in a 3 ∶ 3 mixed
forest. The Pielou evenness index is significantly negatively correlated with soil noncapillary porosity and soil
aeration in a 3 ∶ 1 mixed forest, and significantly positively correlated with total phosphorus content in a 5 ∶ 1
mixed forest. In summary, a 5 ∶ 1 mixed ratio is more suitable for the growth of understory plants, but a 1 ∶ 1
mixed ratio is more suitable for the preservation of soil fertility. |
| Key words: understory vegetation soil fertility mixed Eucalyptus robusta |
