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为了阐明影响天山云杉（Picea schrenkiana var. tianschanica）林林窗透光率的因素及其作用关系，本研究以148个林窗为样本，从林窗特征、林分特征和地形地貌特征三个维度选取10个观测变量，采用结构方程模型（SEM）方法分析了林窗透光率的影响因素及影响系数。结果表明，林窗面积和海拔对透光率具有正向效应，影响系数分别为0.641和0.221；边界木平均高、林分株数密度、坡度、林分平均高和林分平均胸径对透光率具有负向效应，影响系数分别为-0.573、-0.487、-0.372、-0.247和-0.226。林窗自身特征对透光率的决定作用最为显著，其次为地形地貌特征，而林分特征的影响相对较小且呈负向。
Abstract：In order to elucidate the factors influencing light transmittance and their relationships in canopy gaps of Tianshan spruce(Picea schrenkiana var. tianschanica) forests, this investigation selected 148 gaps as samples and ten observational variables were chosen from three dimensions including gap characteristics, stand characteristics, and topographical and geomorphological characteristics. Also the structural equation modeling(SEM) was employed to analyze the influencing factors and their coefficients on gap light transmittance. The results showed that, gap area and elevation had positive effects on light transmittance, with influencing coefficients of 0. 641 and 0. 221 respectively; Average height of boundary trees, number of trees per hectare, slope, average height of stand, and quadratic mean diameter at breast height had negative effects on light transmittance, with influencing coefficients of-0. 573,-0. 487,-0. 372,-0. 247, and-0. 226, respectively; Gap characteristics exhibited the most significant influence on light transmittance, followed by topographical and geomorphological characteristics, while stand characteristics had a relatively minor and negative effect.
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基本信息:
DOI：10.20088/j.cnki.jxau.2024.06.010
中图分类号:S718.5
引用信息:
[1]侍之雅,潘存德,赵善超,等.基于结构方程模型的天山云杉林林窗透光率影响因素分析[J].新疆农业大学学报,2024,47(06):497-504.DOI:10.20088/j.cnki.jxau.2024.06.010.
基金信息:
中央财政林业草原生态保护恢复资金项目（新林规字[2023]212号）
2025-07-08
2025
2025-09-05
2025
2025-07-30
1
2024-12-15
2024-12-15