【摘要】 为研究云南省大理市苍山东坡云南松人工次生林林分结构,测量和分析其物种组成、直径结构、树高分布、角尺度、大小比、混交度和密集度等指标。结果显示:(1)苍山东坡云南松次生林中物种多样性较丰富,各树种低度混交,伴生树种株数稀少。(2)不同径阶直径和不同树高距的树高均呈偏左分布,林分树高有向正态分布演替的趋势(呈现单峰曲线)。(3)林分角尺度均值为0.4804,整体呈随机分布,林木生长处于中庸状态■,各树种呈现极弱度混交状态■,林木稀疏■。(4)角尺度对大小比、混交度与密集度均有一定影响。因此建议在林中空旷地块补植乡土树种,改善林窗环境,提高光照利用率,促进向顶级植被演化进程。研究结果将为云南大理苍山东坡云南松次生林可持续经营提供参考。更多还原

【Abstract】 In order to explore the structural characteristics of planted Pinus yunnanensis secondary forests in the eastern slope of Cangshan Mountain, species composition, diameter structure, height distribution, angular scale, size ratio, mixing degree, and density were measured and analyzed.The results revealed that:(1) Rich species diversity with low-level intermixing among tree species but sparse counts of companion species within the Pinus yunnanensis artificial secondary forests.(2) Different diameter classes and height ranges exhibited a left-skewed distribution, indicating a tendency towards a normal distribution in tree height within the forest.(3) The mean angular scale of the forest was 0.480 4,indicating an overall random distribution of trees, with trees in a moderate state ■,showing weak mixing among tree species■,and sparse tree density■.(4)Angular scale had a certain impact on size ratio, mixing degree, and density.We propose replanting indigenous tree species in open areas to enhance forest gaps, improve light utilization, and promote the evolution towards a climax vegetation phase.These findings provide valuable insights for sustainable management of Pinus yunnanensis artificial secondary forests in the eastern slope of Cangshan Mountain.更多还原