| 嵌套式回归建立树木生物量模型 |
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| 引用本文： | 刘琪璨.嵌套式回归建立树木生物量模型[J].植物生态学报,2009,33(2):331-337. |
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| 作者姓名： | 刘琪璨 |
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| 作者单位： | (北京林业大学林学院,北京 100083) |
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| 基金项目： | 科技部国际合作项目，国家重点基础研究发展规划(973计划)，中国科学院野外台站研究项目 |
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| 摘 要： | 该文介绍了一种建立树木生物量模型的简单快速方法——嵌套式回归。基本原理是以枝轴为基本单位, 逐级拟合。过程是把枝条分解成枝轴, 从枝轴到枝条, 再到单株, 拟合不同层次或尺度的生物量模型。建立枝轴生物量方程, 估计各级枝轴生物量, 将枝轴生物量(实测值或模拟值)总和起来便得到枝条生物量。由于样本单元之间有包含关系, 实际测定的样本很小, 具有快速实用的特点。检验结果显示, 模型预测值和实测值具有较高的一致性。
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| 关 键 词： | 生物量 枝条 异速生长方程 嵌套式回归 |
NESTED REGRESSION FOR ESTABLISHING TREE BIOMASS EQUATIONS |
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| LIU Qi-Jing.NESTED REGRESSION FOR ESTABLISHING TREE BIOMASS EQUATIONS[J].Acta Phytoecologica Sinica,2009,33(2):331-337. |
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| Authors: | LIU Qi-Jing |
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| Affiliation: | Department of Forest Science, Beijing Forestry University, Beijing 100083 |
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| Abstract: | Aims The objective was to introduce a simplified method called nested regression for quick establishment of allometric models for tree biomass. Methods Main branches at all orders were used as basic sample units. The biomass of a branch was obtained by summing that of its sub-branches or sub-main branches, either observed or estimated. Thus the span of branch diameter for the equation was extended. The branch was dissected into main braches, and a main branch is the axis of a branch at any order. Biomass equations were established for main branches, branches and individual trees, progressively. By summing the values of main braches, the biomass of a branch in a higher order was obtained. Important findings Because of data nesting, i.e., small branches were encompassed in their upper-order branches, the measured sample was reduced to a minimum, making the method time- and cost-effective. Satisfactory accuracy of predicted values was shown by testing with observed data. |
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| Keywords: | biomass branch allometric equation nested sampling |
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