Forest tree spatial characteristics of a coniferous, broad-leaf mixed forest on Mount Tianmu
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摘要: 为了解天目山针阔混交林林木空间的特性，以期对该地区森林可持续经营模式的实践提供理论基础，设置了15块30 m 30 m的固定标准地，采用实测调查法，调查样地内所有胸径5 cm的林木特征值。以林木冠幅作为空间分割尺度来生成Voronoi图，确定林木空间结构单元，统计分析林木空间不同尺度上的差异性。结果表明：单株树种的空间面积差异性较大，群组中每株树木周围平均有4~5株树。优势种中苦槠Castanopsis sclerophylla，锥栗Castanea henryi和麻栎Quercus acutissima等树种的空间面积大小较稳定，而马尾松Pinus massoniana，杉木Cunninghamia lanceolata，白栎Quercus fabric和山矾Symplocos caudata等树种空间面积大小差异性较大。林木胸径的大小对其所占空间面积有一定影响，而对其周围邻近木的株数影响不大。目标树的最近邻木株数为3~13株，多数为5~7株，平均为6株。天目山针阔混交林为强度混交林，林分群落结构相对稳定。图8表2参25Abstract: To understand characteristics of forest tree spacing in a coniferous, broad-leaf mixed forest on Mount Tianmu and to provide a theoretical basis for sustainable forest management, fifteen 30 m 30 m fixed plots were established to measure characteristics of all trees over 5 cm DBH. The forest crown was used for a spatially segmented scale to generate a Voronoi Diagram, to determine the spatial unit between trees, and for statistical analysis of differences with various scales of tree spacing. Results showed that single tree spacing had large differences, with an average of four to five trees in a group. The spatial area was stable for dominant species of Castanopsis sclerophylla, Castanea henryi, and Quercus acutissima, but large spatial difference were found with Pinus massoniana, Cunninghamia lanceolata, Quercus fabric, and Symplocos caudata. DBH influenced spatial area, but not the nearest-tree number. The range of nearest-tree number for target trees was 3 to 13, with the mode being 5, 6, and 7, and the mean was 6. Overall, Mount Tianmu was a well-established, mixed forest, with a relatively stable community structure.［Ch, 8 fig. 2 tab. 25 ref.］
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Key words:
- forest ecology /
- coniferous, broad-leaf mixed forest /
- Voronoi diagram /
- spatial structure /
- mingling /
- Mount Tianmu
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.05.004
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