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首页> 外文期刊>New Forests >Modeling the height-diameter relationship and volume of young African mahoganies established in successional agroforestry systems in northeastern Brazil
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Modeling the height-diameter relationship and volume of young African mahoganies established in successional agroforestry systems in northeastern Brazil

机译：在巴西东北部建立成立的年轻非洲玉宝长度的高度直径关系和体积

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The aim of this study was to fit and select height-diameter and stem volume equations for two African mahogany species (Khaya ivorensis and Khaya anthotheca) in the initial development phase (between 2 and 5years old), established in agroforestry systems in northeastern Brazil. We used linear and nonlinear models to predict the total height (h) and stem volume (v), based on data from forest inventories and stem measurements of standing trees. We tested the following hypotheses: (1) the simple linear model is the most accurate to estimate the total height of young African mahogany trees in relation to different types of height-diameter models (linearized, nonlinear and those with transformed variables); (2) simple and double-entry stem volume models have the same precision in estimating the individual volume of young African mahogany trees. The results showed that the simple linear height-diameter model was most accurate to estimate the height of both African mahogany species. The age's effect (young trees) and probably the predominantly monopodial development of the Khaya spp. trees sampled were discussed as the causes of the linear nature of the models that best described the height-diameter relationship. The stem volume equations for Khaya ivorensis and Khaya anthotheca were well adjusted. However, the double-entry Spurr's model was more accurate than the other models for both species. Furthermore, for the Khaya ivorensis, the one-entry (diameter) Husch's model generated similar stem volume estimates to Spurr's model.
机译：本研究的目的是在初始开发阶段（2至5年龄）的初始开发阶段（2至5岁）的初始开发阶段（khaya ivorensis和khaya Anthotheca）在初始开发阶段（旧的）中，在巴西的农林美食系统中建立，选择了高度直径和茎体方程。我们使用了线性和非线性模型来预测基于森林清单和常设树木茎测量的数据的总高度（H）和茎体积（V）。我们测试了以下假设：（1）简单的线性模型是最准确的，最准确地估计与不同类型的高度直径模型相对于不同类型的高度直径模型（线性化，非线性和变形变量）的总体上最准确; （2）简单和双入口阀杆卷模型在估计年轻非洲桃花心木树的单个体积时具有相同的精度。结果表明，简单的线性高度直径模型最准确地估算非洲桃花心木种类的高度。年龄的效果（幼树），可能是Khaya SPP的主要单倍发育。将树木采样被讨论为最能描述高度直径关系的模型的线性性质的原因。 Khaya Ivorensis和Khaya Anthotheca的茎体方程进行了很好的调整。但是，双入口螺母的模型比两种物种的其他模型更准确。此外，对于Khaya Ivorensis，单进入（直径）壳壳模型为斯派的模型产生了类似的茎体估计。

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