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冀北山地不同植被类型下白桦的分形维数
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Abstract:
以冀北山地白桦为研究对象，选取不同植被类型下的白桦标准枝，对其标准枝的分形维数进行计算，以枝长，枝径，分枝数，生物量为参数估算白桦分形维数，揭示冀北山地白桦分形维数在不同植被类型的变化特征，结果显示：白桦纯林的分形维数 > 落叶松–白桦混交林 > 荒草坡，表明白桦树种内的竞争大于白桦和落叶松种间的竞争，种内占据生态空间的能力要大于种间。合理配置白桦的分布，有利于提高白桦的生存能力。
Taking white birch in northern Hebei mountain as the research object, the standard branches of white birch under different vegetation types are selected, and the fractal dimension of the standard branches is calculated. The fractal dimension of white birch is estimated with the parameters of branch length, branch diameter, branch number and biomass, so as to reveal the variation characteristics of the fractal dimension of white birch in northern Hebei mountain in different vegetation types. The results show that the fractal dimension of pure white birch forest > larch white birch mixed forest > barren grass slope. The table shows that the intraspecific competition of birch is greater than that of white birch and larch, and the ability of intraspecific occupying ecological space is greater than that of interspecific. Reasonable distribution of white birch is beneficial to improve the survival ability of white birch.
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