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| 油松、侧柏人工林树冠率的Weibull分布及动态预测 | |
| 引用本文： | 刘平,马履一,贾黎明,于萍.油松、侧柏人工林树冠率的Weibull分布及动态预测[J].福建林业科技,2008,35(3). |
| 作者姓名： | 刘平 马履一 贾黎明 于萍 |
| 作者单位： | 1. 北京林业大学省部共建森林培育与保护教育部重点实验室,北京,100083;沈阳农业大学林学院,辽宁,沈阳,110161 2. 北京林业大学省部共建森林培育与保护教育部重点实验室,北京,100083 3. 辽宁省朝阳市林业种苗管理站,辽宁,朝阳,122000 |
| 基金项目： | 引进国际先进农业科技计划(948计划)，沈阳农业大学校科研和教改项目 |
| 摘 要： | 应用Weibull函数来拟合油松(Pinus tabulaeformis)、侧柏(Platycladus orientalis)人工林树冠率的分布,研究发现林分平均树冠率与相对林分密度指数之间呈极显著线性关系,并随林分相对密度指数增加而降低;Weibull函数参数b与油松、侧柏人工林林分平均树冠率呈极显著线性关系,参数c与侧柏林分平均树冠率呈二次方关系,在油松林分中则为一常数值;通过对未参加建模的油松、侧柏样地进行动态预测,发现Weibull函数对林分树冠率分布预测值与实测值之间没有显著性差异。因此,该方法可以应用于预测油松和侧柏人工林树冠率的动态分布。 |
| 关 键 词： | 树冠率 Weibull分布 动态预测 油松 侧柏 |
Weibull distribution and dynamic prediction of crown ratio for Pinus tabulaeformis and Platycladus orientalis plantation |
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| LIU Ping,MA Lu-yi,JIA Li-ming,YU Ping.Weibull distribution and dynamic prediction of crown ratio for Pinus tabulaeformis and Platycladus orientalis plantation[J].Journal of Fujian Forestry Science and Technology,2008,35(3). | |
| Authors: | LIU Ping MA Lu-yi JIA Li-ming YU Ping |
| Abstract: | Weibull function is applied to work out the distribution of crown ratio of Pinus tabulaeformis and Platycladus orientalis.The results shows that mean stand crown ratio and relative stand density index have very significant linear relation,and mean stand crown ratio decrease with relative stand density index increasing.It is great significant linear relation between Parameter b of Weibull function and mean stand crown ratio for P.tabulaeformis and P.orientalis,It is significant quadratic equation relation between Parameter c of Weibull function and mean stand crown ration for P.orientalis,but is a constant value for P.tabulaeformis.Using some plots that not built models to carry through dynamic simulation,the result shows that the observed value of stand crown ratio distribution is not significant difference with simulation value of Weibull function.So,this method can be used in practice. |
| Keywords: | crown ratio Weibull function dynamic prediction Pinus tabulaeformis Platycladus orientalis |
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