9年生武夷桦胸径结构规律研究

The structure law of diameter at breast diameter of 9-year-old Betula wuyiensis

为弥补武夷桦研究空白,本次从林分胸径结构规律开展对武夷桦的研究,选用均匀度、整齐度、偏度、峰度等4个指标,以及正态分布、对数正态分布、贝塔分布、伽玛分布、韦布尔分布等5个常见的概率分布函数,分析9a生武夷桦胸径结构规律。研究结果表明,9a生武夷桦胸径分布较均一、较平坦、左偏,胸径结构规律可用威布尔概率函数进行描述,拟合相关系数最低为0.904。

To fill up the blank of Betula wuyiensis research, the structure of stand DBH law of B. wuyiensis was carried out in this study. Four indicators of evenness, uniformity, deflection, kurtosis, etc, as well as the normal distribution, lognormal distribution, beta distribution, the gamma distribution and Weibull distribution of five common probability distribution function, were applied to analyze the structure of stand DBH law of 9-year-old B. wuyiensis. The results showed that the DBH distribution of 9-year-old B. wuyiensis was uniform, flat and left-deviation, and the DBH structure law could be described by Weibull probability function with the fitting correlation coefficient as low as 0.904. The results provides important theoretical support for the later extension and application of B. wuyiensis.