福建省针叶混交近熟林胸径结构分析  

Diameter Structural Distribution of Coniferous Mixed Near-Mature Forest in Fujian Province

作　　者：邱群 QIU Qun(Yangkou National Forest Farm of Fujian Province,Nanping 353000,Fujian,China)

机构地区：[1]福建省洋口国有林场,福建南平353000

出　　处：《福建林业科技》2023年第2期24-27,33,共5页Journal of Fujian Forestry Science and Technology

基　　金：福建省林业科技项目(闽林便函[2020]9号)。

摘　　要：于2022年在福建省洋口国有林场来舟试验中心,以23年生的4种针叶树(红桧、台湾肖楠、杉木、福建柏)混交林为研究对象,用偏度(Cs)、峰度(K)和变动系数(C)为指标研究其胸径分布特征,利用6种概率密度函数(正态分布、对数正态分布、韦伯分布、伽玛分布、增长分布、负指数分布),结合卡方(χ^(2))检验,分析其胸径分布规律。结果表明:23年生的4种针叶树混交林平均胸径为17.25 cm,在5.5~32.2 cm之间,中径阶林木株树居多;林分胸径主要分布在11~23 cm径阶,株树累计百分比高达77%以上;6种分布函数中,以Logistic分布拟合效果好,精度高,能准确地描述针叶混交林胸径分布规律;根据Logistic分布函数调整林分株数分布,对于提高林分质量、增强林地生产力具有一定的参考价值。In 2022,at the Laizhou Experimental Center of Yangkou state-owned Forest Farm in Fujian Province,we studied the diameter at breast height(DBH)distribution characteristics of 23-year-old mixed coniferous forests comprising four conifer species(Chamaecyparis formosensis,Calocedrus formosana,Cunninghamia lanceolata,and Fokienia hodginsii)using skewness(Cs),kurtosis(K),and the coefficient of variation(C)as indicators.We used six probability density functions(normal distribution,log-normal distribution,Weibull distribution,gamma distribution,growth distribution and negative exponential distribution)in combination with the chi-square(χ^(2))test to analyze the DBH distribution patterns.The results showed that the average DBH of the mixed coniferous forests of the four species at 23 years old was 17.25 cm,ranging from 5.5 cm to 32.2 cm,with a predominance of trees in the middle diameter class.The main DBH distribution of the stands was between 11 cm and 23 cm,with a cumulative percentage of trees exceeding 77%.Among the six distribution functions,the Logistic distribution showed the best fit and highest accuracy,accurately describing the DBH distribution pattern of mixed coniferous forests.Adjusting the tree number distribution according to the Logistic distribution function may have some reference value for improving stand quality and enhancing forestland productivity.

关 键 词：针叶混交林 胸径结构 分布函数 拟合效果 

分 类 号：S725.2[农业科学—林木遗传育种] S758.55[农业科学—林学]