利用Weibull分布函数预测林木的直径分布

1.提出了在解析植物群体的直径分布时不划分直经阶,直接求累计频度的方法;2.提出和讨论了用最小二乘法求解Weibull分布函数的参数的方法,并用此法推算了日本落叶松(Larix leptolepis)模拟密度试验林分的直径分布的各参数;3.weibull分希函数的两种形式(1式和2式)在解析直径分布时,都具有较高的拟合度;4.对平均直径和Weibull分布的各参数之间的关系作了探讨,提出了它们之间的近似表达式。利用这些关系式,可简单地由平均直径预测林分的直径分布。

ESTIMATING DIAMETER DISTRIBUTION WITH THE WEIBULL DISTRIBUTION FUNCTION

1 . In this paper, authors advised a new method calculating the cumulative relative frequency,to study frequent distribution of plant size in the population.2. It was claimed to estimate the parameters in two forms of the Weibull function by means of the least squares method. And the parameters of diameter distribution in small model (Larix leptolepis) forests were calculated by employing the method. -3. The diameter distribution of the model forests estimated by the Weibull function agreed with the observed values well.4. The relationships between mean diameter and parameters of the Weibull function were discussed and their approximate formula were given, respectively.Using them,the diameter distribution can be easily estimated from mean diameter.