| 短轮伐期桉树林分树冠生长的阶跃函数模型 |
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| 引用本文： | 周元满,谢正生,刘素青,刘新田.短轮伐期桉树林分树冠生长的阶跃函数模型[J].南京林业大学学报(自然科学版),2006,30(2):59-62. |
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| 作者姓名： | 周元满 谢正生 刘素青 刘新田 |
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| 作者单位： | 1. 广东海洋大学农学院,广东,湛江,524088
2. 华南农业大学林学院,广东,广州,510642 |
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| 基金项目： | 广东省林业厅科技攻关项目;广东省农业科技攻关项目 |
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| 摘 要： | 针对短轮伐期桉树人工林林分冠幅生长的特点,在现实林分调查的基础上,模拟提出了适合有变点的短轮伐期桉树U6无性系林分冠幅生长阶跃函数模型。通过求解模型参数,分析了各参数的生物学意义。对树冠与林龄的回归分析结果表明:阶跃函数模型在具有变点的桉树林分树冠生长过程中的应用效果优于一般回归拟合模型,可较好地解决分段拟合模型在变点上的不连续问题。模型优化结果表明:在所有参与模拟的树冠生长的阶跃模型中,以幂函数模型为最优。
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| 关 键 词： | 桉树 阶跃函数 冠幅 生长模型 短轮伐期 |
| 文章编号： | 1000-2006(2006)02-0059-04 |
| 收稿时间： | 2005-01-21 |
| 修稿时间： | 2005-10-09 |
The Unit Step Function Model for Crown Diameter of Short Rotation Eucalyptus |
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| ZHOU Yuan-man,XIE Zheng-sheng,LIU Su-qing,LIU Xin-tian.The Unit Step Function Model for Crown Diameter of Short Rotation Eucalyptus[J].Journal of Nanjing Forestry University(Natural Sciences ),2006,30(2):59-62. |
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| Authors: | ZHOU Yuan-man XIE Zheng-sheng LIU Su-qing LIU Xin-tian |
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| Institution: | 1. Agronomy College Guangdong Ocean University,Zhanjiang 524088, China; 2. Forest College South China Agriculture University,Guangzhou,510642,China |
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| Abstract: | According to the crown growth characteristics in industrial Eucalyptus stand of short rotation,the unit step function model was put forward for the process with changing point of short rotation Eucalyptus clones U6 based on the survey practical stands.The biology signification of the parameter of the model was analyzed by solving the coefficient.The analyzable conclusions of the regression model between crown diameter and age show that the utility of unit step function model in the crown growth process with the changing point is better than the usual regression methods,and the unit step function model can solve discontinuance on the changing point.The optimizing model results show that the power model is the best one in all models tested. |
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| Keywords: | Eucalyptus Unit step function Crown Growth curve Short rotation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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