降水量下限引种区沙地樟子松幼林种群树高分布偏斜度和不整齐性

对降水量下限引种区沙地樟子松自然稀疏前人工林种群树高分布偏斜度和不整齐性的研究表明,种群高生长的不整齐性和分布的不对称性在林分自疏前随着林分发育而下降,造成高生长事整齐性变化的因素主要有年龄,初始生长状况,种群密度,对土壤水分的竞争和沙丘部位的差异;沙丘部位对林分不整齐性的影响作用要大于密度。     

The Estimation of Skewness and Kurtosis of Random Effects in the Linear Model

Generalising the ANOVA method of estimating variance components in mixed linear models a simple procedure is presented to estimate skewness and kurtosis of the distributions of the random effects of the model. For the model II of a one-way classification this procedure is demonstrated explicitly.