红树植物木榄种群高度结构的分形特征

 采用计测等值线分形维数的方法，探讨山口国家级红树林自然保护区内的木榄(Bruguiera gymnorrhiza)种群高度结构的特征。结果表明，木榄种群的高度结构具有分形的特征，其计盒维数介于1.61～1.90之间，信息维数介于1.63～1.84之间，分形维数的高低主要与幼树个体的数量、个体的集聚程度和高度层次结构的复杂程度等密切相关。计盒维数定量描述种群占据垂直空间的能力和程度，而信息维数揭示种群高度层次细节的尺度变化强度和个体高度分布的非均匀性程度。分析表明，等值线法能够有效地表征木榄种群高度结构的分

FRACTAL CHARACTERISTICS OF THE HEIGHT STRUCTURE OF BRUGUIERA GYMNORRHIZA POPULATION

The characteristics of the height structure of Bruguiera gymnorrhiza population in National Shankou Mangrove Nature Reserve were studied by measuring the fractal dimension of height contour. The results showed that the height structure of B. gymnorrhiza population possesses fractal characteristics; the box dimension ranges from 1.61 to 1.90, and the information dimension from 1.63 to 1.84. The fractal dimension is closely related to the number of sapling individuals, the aggregated intensity of all individuals, the complex degree of height architecture etc. The box dimension quantifies the spatial occupation ability and degree of the population, while the information dimension reflects the scale variation degree of the height architecture and discloses the unevenness of individual height distribution. The analysis suggests that the contour method may be suitable, for describing the fractal characteristics of the height structure of B. gymnorrhiza population, and the box dimension and information dimension should be the effective indexes.