抚育间伐对长白落叶松人工林树木结构复杂性的影响  

Effects of thinning on structural complexity of Larix olgensis plantation

作　　者：王帆 贾炜玮[1,2] 李凤日[1,2] 李丹丹[1] 郭昊天 WANG Fan;JIA Weiwei;LI Fengri;LI Dandan;GUO Haotian(College of Forestry,Northeast Forestry University,Harbin 150040,China;Key Laboratory of Sustainable Forest Ecosystem Management,Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,哈尔滨150040 [2]东北林业大学森林生态系统可持续经营教育部重点实验室,哈尔滨150040

出　　处：《应用生态学报》2024年第7期1744-1752,共9页Chinese Journal of Applied Ecology

基　　金：国家重点研发计划项目(2023YFD2200802);中央高校基本科研业务费专项资金(2572019CP08)资助。

摘　　要：本研究以孟家岗林场不同间伐强度的长白落叶松人工林为对象,获取样地内单木点云数据,基于MATLAB平台应用分形分析理论提取盒维数来表征长白落叶松树木结构复杂性,并评估不同间伐强度及树木属性对长白落叶松树木结构复杂性的影响。结果表明:长白落叶松盒维数在对照(CK:1.68±0.07)、低中强度间伐(处理T_(1)、T_(2)、T_(3):1.74±0.07)和高强度间伐(处理T4:1.81±0.06)之间存在显著差异,间伐强度增加了树木结构复杂性。在树干属性中,胸径、树高与盒维数呈显著正相关,高径比与盒维数呈显著负相关;在树冠属性中,树冠体积、表面积、投影面积和冠幅与盒维数呈显著正相关。Hegyi竞争指数与盒维数在对照和低中强度间伐下呈显著负相关,在高强度间伐下相关性不显著。间伐影响了长白落叶松树木结构复杂性,树干属性和树冠属性是长白落叶松树木结构复杂性的主要驱动因素。In this paper,we collected the individual tree point cloud data in the plots of Larix olgensis plantations with different thinning intensities in Mengjiagang Forest Farm,applied the fractal analysis theory to extract box dimensions(D_(b))on MATLAB platform,and characterized the structural complexity of L.olgensis.We assessed the effect of different thinning intensities and tree attributes on the structural complexity of L.olgensis.The results showed significant differences in L.olgensis D_(b) between control(CK:1.68±0.07),low and medium intensity thinning(T_(1),T_(2),T_(3):1.74±0.07),and high intensity thinning(T_4:1.81±0.06),which indicated that the thinning intensity increased tree structural complexity.For trunk attribute,the diameter at breast height and tree height was significantly positively correlated with D_(b),while the height-to-diameter ratio was significantly negatively correlated with D_(b).For canopy attribute,crown volume,surface area,projected area,and crown diameter was significantly positively correlated with D_(b).Hegyi competition index was significantly negatively correlated with D_(b) in the control and low-moderate-intensity thinning treatments,but not significantly correlated with D_(b) in the high-intensity thinning treatment.It indicated that thinning influenced L.olgensis structural complexity,with trunk attribute and canopy attribute as the main drivers of L.olgensis structural complexity.

关 键 词：长白落叶松人工林 间伐 分形分析 盒维数 结构复杂性 地基激光雷达 

分 类 号：S791.22[农业科学—林木遗传育种]