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以湖南青石冈林场木荷人工林为研究对象,分析了木荷直径结构规律。运用威布尔分布(Weibull)、正态分布、对数正态分布和伽马(Gamma)分布进行直径拟合,并结合X2对拟合结果进行检验,结果表明:木荷林分平均胸径为10.4cm,在5.1～37.1cm之间变动,全距32.0cm,径阶分布范围不大;小径阶的林木数量居多(6～12cm),累计百分比已达到83.7%;4种分布函数中,威布尔分布拟合效果最好,其次是对数正态分布,但两者的差异不大,均可用于预测木荷林直径结构。
Taking the Schima superba plantation in Qingshi, Hunan Province as the research object, the law of the diameter structure of Schima superba was analyzed. Weibull, normal distribution, logarithmic normal distribution and gamma distribution were used for diameter fitting, and X2 was used to test the fitting results. The results showed that the average diameter at the center of Meriones was 10.4 cm, ranging from 5.1 to 37.1 cm with a full range of 32.0 cm, with a small range of radial distribution; the number of small-diameter trees was mostly (6 ~ 12 cm) and the cumulative percentage reached 83.7%; among the four distribution functions, Distribution fitting best, followed by a logarithmic normal distribution, but little difference between the two, can be used to predict diameter structure of wood.