沈亚洲, 张青, 刘文桢, 等. 小陇山天然油松林结构多样性动态特征研究[J]. 西南林业大学学报(自然科学), 2024, 44(4): 45–53. DOI: 10.11929/j.swfu.202303076
引用本文: 沈亚洲, 张青, 刘文桢, 等. 小陇山天然油松林结构多样性动态特征研究[J]. 西南林业大学学报(自然科学), 2024, 44(4): 45–53. DOI: 10.11929/j.swfu.202303076
Shen Yazhou, Zhang Qing, Liu Wenzhen, Liu Qiao, Ma Jianmin, Li Mingyue, Zhang Ganggang. Dynamic Characteristics of Structural Diversity for Pinus tabulaeformis Natural Forest in Xiaolong Mountains[J]. Journal of Southwest Forestry University, 2024, 44(4): 45-53. DOI: 10.11929/j.swfu.202303076
Citation: Shen Yazhou, Zhang Qing, Liu Wenzhen, Liu Qiao, Ma Jianmin, Li Mingyue, Zhang Ganggang. Dynamic Characteristics of Structural Diversity for Pinus tabulaeformis Natural Forest in Xiaolong Mountains[J]. Journal of Southwest Forestry University, 2024, 44(4): 45-53. DOI: 10.11929/j.swfu.202303076

小陇山天然油松林结构多样性动态特征研究

Dynamic Characteristics of Structural Diversity for Pinus tabulaeformis Natural Forest in Xiaolong Mountains

  • 摘要: 基于小陇山天然油松林每木调查3期(2010年、2015年、2020年)数据,利用林分空间结构参数–径阶二元分布试图描述林分空间和林木大小结构特征,采用单因素方差分析和多重比较量化相同空间结构状态下林木大小在不同时期的差异,并利用α多样性指数描述不同空间结构状态下林木大小多样性变化趋势。结果表明:不同时期天然油松林中50.0%以上同一径阶林木呈随机分布,且随机分布林木大小分化程度的多样性最高;不同时期林分中异种伴生的6~8 cm径阶林木最为常见,但混交较差林木的大小多样性相对较高,2010年与2020年零度混交林木的径阶分布有显著差异(P < 0.05);不同时期林木径级大小与其优势程度均呈正相关,优势和亚优势林木径阶分布的多样性较高;不同时期60.0%以上同一径阶林木存在树冠重叠,且很密集和密集林木径阶分布多样性较高,2010年与2015年较为密集分布林木(C=0.50、0.75)株数比例均与2020年有显著差异(P < 0.05)。因此,小陇山天然油松林不同空间结构状态下林木大小多样性较差,且在不同时期之间的动态变化不明显,亟须动态调整优化森林结构,以精准提升森林质量。

     

    Abstract: According to 3 periods(i.e., 2010, 2015 and 2020) investigated datasets on Pinus tabulaeformis natural forest in Xiaolong Mountains, the bivariate distributions of stand spatial structure parameter and DBH class were used to quantitatively describe the size and spatial structure characteristics. One-way ANOVA and multiple comparison method were used to analyze the differences of tree size distribution under the same spatial structure state among different periods. The α diversity indices were calculated to describe the dynamic trend of tree size diversity under same spatial structural state. The results showed over 50.0% trees with same DBH class were randomly distributed in different periods of P. tabulaeformis natural forest, and the size structural diversity of randomly distributed trees were the highest. The 6–8 cm DBH class individual trees surrounded by heterogeneous species were the most common, and the size structural diversity of poorly mixed trees was higher. The DBH distribution of zero mixed trees was significantly different between 2010 and 2020(P < 0.05). The forest diameter class size was positively correlated with dominance in each period, and the size structural diversity of dominant and subdominant trees was higher. Over 60.0% of same DBH class trees were overlapped with the nearest adjacent trees in each period, and the very dense and dense trees showed higher size diversity. The proportion of crowdedly distributed trees(C=0.50, 0.75) in 2010 and 2015 was significantly different from that in 2020(P < 0.05). Therefore, the size structural diversity of different spatial structure states was poor in P. tabulaeformis natural forest in Xiaolong Mountains, and its dynamic changes among different periods were not obvious. It is urgent to dynamically adjust and optimize forest structure to accurately improve forest quality.

     

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