广东云浮郁南地区江南油杉小种群特征分析  

Characteristics Analysis of Small Population of Keteleeria fortunei var.cyclolepis in Yunfu Yunan Area of Guangdong Province

作　　者：罗熠 王润辉[2] 陈聪 谢振飞 李文刚 欧阳昆唏 郑会全[2] LUO Yi;WANG Runhui;CHEN Cong;XIE Zhenfei;LI Wengang;OUYANG Kunxi;ZHENG Huiquan(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou,Guangdong 510642,China;Guangdong Academy of Forestry,Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangzhou,Guangdong 510520,China;Yunfu State owned Tongle Forest Farm,Yunfu,Guangdong 527199,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]广东省森林培育与保护利用重点实验室/广东省林业科学研究院,广东广州510520 [3]云浮市国有同乐林场,广东云浮527199

出　　处：《林业与环境科学》2025年第2期67-71,共5页Forestry and Environmental Science

基　　金：广东省省级科技计划项目(2024A1111120014)资助。

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。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 model-ing 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 recommen-ded to implement artificial intervention to promote the formation of a stable uneven-aged,multi-layer popula-tion structure,thereby achieving a self-sustaining development state.

关 键 词：江南油杉 径阶结构 苗高 地径 

分 类 号：S791.15[农业科学—林木遗传育种]