Many issues involving leaf areas (LA) allometry, such as the possibility of adjusting morphometric models based on the leaves of different species and the influence model performance on intraspecific variability, are still unclear. In this work, we described allometric equations for 14 different woody tropical species. This study’s novelty is to show how a generalised allometric equation accurately estimates LAs of different species with similar leaf morphologies [oblong: Ŷ = 0.6356(LW)^1.0260, and elliptical: Ŷ = 0.6552(LW)^1.0094]. Natural variation that occurs in the leaf development does not represent an obstacle to the implementation of generalised models. In general, simple linear models are considered ineffective to describe the full range of leaf variation. Extrapolation of these equations to other woody species of similar leaf morphology can be compared with models developed for oblong and elliptical leaves, based on the principle that in potential models, the variation of the intercept coefficient (β₀) tended to 0.5 for leaves more elongated to 0.7 in less elongated leaves. While the angular coefficient (β₁) tended to vary from 0.97 for less elongated leaves, up to 1 when the relationship between LA is remarkably close to a rectangle.

中文翻译：

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预测巴西大西洋雨林木本树种叶面积的新方法

尚不清楚涉及叶面积（LA）异度的许多问题，例如基于不同物种的叶调整形态模型的可能性以及模型性能对种内变异性的影响，目前尚不清楚。在这项工作中，我们描述了14种不同热带木本植物的异速方程。这项研究的新颖性是展示如何广义异速生长方程精确地类似叶形态估计不同物种的LA的[长方形：Ŷ  = 0.6356（LW）^1.0260，和椭圆形：Ŷ  = 0.6552（LW）^1.0094]。叶片发育中发生的自然变化并不代表实施通用模型的障碍。通常，简单的线性模型被认为无法有效描述整个叶片变化范围。这些方程以类似叶形态的其它木本物种的外插可与长圆形和椭圆形的叶开发的模型进行比较，根据在潜在模型中，截距系数（β变化的原理₀）趋向于0.5叶多个细长伸长较小的叶片中，将其降至0.7。虽然角系数（β ₁）趋向于从0.97变化为小于细长叶，最高达1时LA之间的关系是非常接近的矩形。