| 摘要: |
| 为探明广东省云浮市郁南地区的江南油杉 Keteleeria fortunei var. cyclolepis 人工小种群的种群结
构特征及动态变化趋势, 明确其自然更新潜力与衰退风险, 该研究结合实地调查, 采用 SLAM100 手持激
光雷达扫描仪对江南油杉种群进行全林扫描, 通过 SLAM GO POST 软件重建三维点云模型, 提取单木胸
径、 树高及冠幅参数, 划分径阶并统计各级个体占比, 同时对林下自然更新幼苗的地径和苗高进行分析。
结果表明, 江南油杉种群 60 cm 径阶分布树木数量最多, 占比 18. 52%; 树木胸径最大达到了 73. 3 cm,
最小为 25. 4 cm, 变异系数为 26. 86%; 林下有许多自然更新的幼苗, 最小地径为 0. 09 cm, 最大地径为
0. 26 cm, 最小苗高为 4. 20 cm, 最大苗高为 28. 70 cm, 地径和苗高的变异系数分别为 21. 03%和 27. 84%;
种群整体上呈现出衰退的形势, 若种群中幼树数量得不到及时补充, 种群在未来有消失的风险。 建议采取
人工干预的手段促进其形成稳定发展的异龄复层种群, 以实现种群自我维持的稳定发展状态。 |
| 关键词: 江南油杉 径阶结构 苗高 地径 |
| DOI： |
| 分类号: |
| 基金项目:广东省省级科技计划项目 (2024A1111120014) 资助。 |
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| Characteristics Analysis of Small Population of Keteleeria fortunei var. cyclolepis in Yunfu Yunan Area of Guangdong Province |
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Luo Yi1, Wang Runhui2, Chen Cong3, Xie Zhengfei3, Li Wengang3, Ouyang Kunxi1, Zheng Huiquan2
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1.South China Agricultural University;2.Guangdong Academy of Forestry,Guangzhou Guangdong;3.Yunfu City Tongle Tree Farm
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| Abstract: |
| To investigate the population structure characteristics and dynamic trends of the small artificial
population of Keteleeria fortunei var. cyclolepis in the Yunfu Yunan area of Guangdong province, and to clarify
its natural regeneration potential and decline risk, this study combined field surveys with 3D point cloud modeling using a SLAM100 handheld LiDAR scanner. The SLAM GO POST software was employed to reconstruct
forest models and extract individual tree parameters (DBH, height, and crown width). Diameter classes were
categorized, and the proportions of individuals in each class were analyzed. Ground diameter and seedling height of natural regeneration under the forest were analyzed. The results showed that the K. fortunei
var. cyclolepis population had the highest number of trees in the 60 cm diameter class, accounting for 18. 52%.
The maximum DBH reached 73. 3 cm, and the minimum was 25. 4 cm, with a coefficient of variation (CV) of
26. 86%. Naturally regenerated seedlings were observed under the forest canopy, with minimum and maximum
ground diameters of 0. 09 cm and 0. 26 cm (CV = 21. 03%), and minimum and maximum seedling heights of
4. 20 cm and 28. 70 cm (CV = 27. 84%). The population overall exhibited a declining trend, and if the number
of saplings is not replenished in time, the population faces a risk of disappearance in the future. It is recommended to implement artificial intervention to promote the formation of a stable uneven-aged, multi-layer population structure, thereby achieving a self-sustaining development state. |
| Key words: Keteleeria fortunei var. cyclolepis diameter structure height of seedlings ground diameter of seedlings |
