抚育间伐对长白落叶松人工林树木结构复杂性的影响

doi:10.13287/j.1001-9332.202407.005

摘要/Abstract

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T₁、T₂、T₃:1.74±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。

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

Abstract: 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 (T₁, T₂, T₃: 1.74±0.07), and high intensity thinning (T₄: 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.

Key words: Larix olgensis plantation, thinning, fractal analysis, box dimension, structural complexity, terrestrial laser scanning

王帆, 贾炜玮, 李凤日, 李丹丹, 郭昊天. 抚育间伐对长白落叶松人工林树木结构复杂性的影响[J]. 应用生态学报, 2024, 35(7): 1744-1752.

WANG Fan, JIA Weiwei, LI Fengri, LI Dandan, GUO Haotian. Effects of thinning on structural complexity of Larix olgensis plantation[J]. Chinese Journal of Applied Ecology, 2024, 35(7): 1744-1752.

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