摘要
研究应用五常市地区宝龙店林场调查的20块次生林标准地的数据,分析林分的直径分布规律,运用指数分布、正态分布和Weibull分布函数对其进行拟合,用R语言对样地数据进行处理,建立直径回归模型,用分布检验并比较各种分布函数对实际数据的拟合效果。研究结果表明:随着林分树木直径不断增加,林木株数在总体上呈现出减小的趋势。在人工林中,正态分布和Weibull分布的拟合效果较好;在阔叶林中,Weibull分布拟合效果更好。
In order to facilitate the analysis of the diameter distribution rule of forest stand,the histogram of the diameter distribution of each forest stand was drawn.Using the exponential distribution,normal distribution and Weibull distribution function on the fitting,using R language to deal with sample data,diameter of regression model is established,with test and compare the various distribution function on the actual data fitting effect.The results show that as the diameter of stand trees increases,the number of stand trees decreases.In artificial forest,the fitting effect of normal distribution and Weibull distribution is better.In broad-leaved forest,exponential distribution and Weibull distribution have better fitting effect.
作者
张连飞
Zhang Lianfei(Qingan State-owned Forest Farm Adminition Berau of Heilongjiang Province,Suihua 152000,Heilongjiang,China)
出处
《林业科技情报》
2020年第3期21-23,共3页
Forestry Science and Technology Information
