【摘要】 兴安落叶松是大兴安岭林区的主要树种,本文分别用累积分布曲线、正态分布等方法拟合不同标准地人工、天然兴安落叶松林分直径结构特征。结果表明:兴安落叶松人工林林分直径分布,其近似遵从于正态分布的合格率为43%;天然林林分直径分布,其近似遵从于正态分布的合格率为45%。兴安落叶松相对累积株数百分数,用线性方程、对数方程、倒数方程、二次方程、三次方程进行拟合,其结果是无论人工林还是天然林,都是三次方程的效果最好。更多还原

【Abstract】 Larix gmelinii is a main tree species in the Greater Xing’an Mountains forest region. The cumulative distribution curve and normal distribution method have been used to fit diameter structure of artificial forest and plantation in different standard ground. As to the diameter structure of artificial forest,pass rate of the normal distribution is about 43%. As to the diameter structure of plantation,pass rate of the normal distribution is about 45%. The linear equation,logarithmic equation,reciprocal equation,quadratic and cubic equations have been used to fit the relative percentage about cumulative number of trees,the cubic equation is the best for natural forest and artificial forest.更多还原