| 摘要: |
| 在广东省古树名木普查的基础上，对广东省一级古树的物种组成和地理分布格局进行分析，对一级古树的树龄、树高、胸围、平均冠幅与人为、自身影响因子进行相关性和差异性分析。结果表明：广东省一级古树 754 株，隶属于 35 科 63 属 82 种（变种）；桑科 Moraceae 的重要值（51.5%）占绝对优势，榕树 Ficus microcarpa、雅榕 Ficus concinna、荔枝 Litchi chinensis、樟 Cinnamomum camphora 和银杏 Ginkgo biloba 为优势种。广东省一级古树树龄主要集中在 500~800 a，随着树龄增大一级古树数量逐
渐减少，树高、胸围和平均冠幅呈正态分布，分别主要集中在 12.0~22.0 m，400.0~900.0 cm，13.0~30.0 m；一级古树空间分布不均，以粤北山区多，东西沿海少。降雨量对广东省一级古树树高、胸围和平均冠幅的影响最为显著，树龄与各环境因子的相关性不显著。不同人为因素对一级古树胸围和树高的影响差异性显著，不同寄生面积对一级古树的影响差异性极显著。综上所述：广东省一级古树种类较丰富，优
势科和优势种明显；环境、人为和自身因素对广东省一级古树形态特征影响较大；建议在古树保护和复壮时应结合实际情况因区施策、一树一策。 |
| 关键词: 一级古树 物种组成 地理分布格局 相关性 差异性 广东省 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技创新项目(2020KJCX004)。 |
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| Analyses on Resource Characteristics and Impact Factors of First-class Old Trees in Guangdong Province |
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tanzhiquan, chenpan, guoshengcai, chenqiuju, Deng Dongwang
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Guangdong Forestry Survey and Planning Institute
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| Abstract: |
| Based on the census of large old trees in Guangdong province, we explored the distribution pattern of first-class old trees and their species composition in Guangdong Province. We also performed correlation analysis and Wilcoxon test to assess the impact factors of the age, height, diameter at breast height (DBH) and crown width of first-class old trees. The results showed that there were 754 species of first-class old trees in Guangdong province, which belonged to 82 species (varieties) in 63 genera of 35 families. The important value of Moraceae was 51.5%, within which Ficus microcarpa, Ficus concinna, Litchi chinensis sonn., Cinnamomum camphora and Ginkgo biloba L. were the dominant species. The main distribution types of families and genera were Pantropics and Asian tropics. The first-class old trees mainly concentrated in 500～800 year old, and then decreased with the increase of the tree age. The tree height, DBH and crown width showed normal distribution, which mainly concentrated in 12.0～22.0 m, 400.0～900.0 cm, 13.0～30.0 m, respectively. The distribution of the first-class large old trees was uneven in Guangdong, with most of individuals were recorded in northern mountains areas and some parts were recorded in coastal areas of the eastern and western of Guangdong. The correlation analysis showed that the rainfall had the most significant effect on the height, DBH and crown width of the first-class old trees, but the correlation between tree age and environmental factors was not significant. Wilcoxon test showed that the effect of artificial factors on the DBH and height of the first-class old trees was significant, and the effect of parasitism was extremely significant. |
| Key words: first-class old tree species composition geographical distribution pattern correlation analysis diff erence analysis Guangdong province |
