Preussner functions for volume estimation of Pinus taeda L. in Southern Brazil

IF 1.5 4区 农林科学 Q2 FORESTRY New Zealand Journal of Forestry Science Pub Date : 2021-06-02 DOI:10.33494/NZJFS512021X66X
F. R. Stefanello, S. P. Netto, A. Behling, A. Pelissari, G. Orso
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Abstract

Background: Taper modelling and volume estimation are key procedures in the management and planning of plantedforests. The objective of this work was to evaluate the taper and volume behaviour of Pinus taeda L. species, along the stemin different ages, using the Preussner taper functions, compared to Schöpfer’s 5th-polynomial, Kozak’s and Max-Burkhart’smodels. This work focused on plantations of Pinus taeda L., due to its wide use as a source of raw material in the forestindustry of southern Brazil. Methods: The data were collected in the last 22 years from the Midwest region of Santa Catarina, of trees ranging in agefrom 3.5 to 18 years. This dataset consisted of a collection of volume sections, with relative diameter measurements alongthe stem, used in conventional forest inventory. The total volume of the trees, obtained by integrating the Preussner taperfunctions, was equated by dividing the stem into four parts, in which parabolas were fitted, and compared with the totaland merchantable volume estimated by Schöpfer’s 5th-degree polynomial, Kozak’s and Max-Burkhart’s functions. Results: Bias, RMSE and r were generally better with the application of Kozak’s model, and AIC and BIC for the Preussner’smodel. Conclusions: Kozak functions were better to provide the merchantable volume. In terms of total volume both functions,Kozak and Preussner, provided reliable estimates. The advantage of the procedure proposed by Preussner is the flexibilityof the fitted taper functions, the simplicity of volume calculations by integration, and the feasibility for interpreting theircoefficients.
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巴西南部火炬松体积估算的Preussner函数
背景:锥形建模和体积估计是种植林管理和规划的关键程序。本工作的目的是使用Preussner锥函数,与Schöpfer的第五多项式、Kozak和Max-Burkhart的模型相比,评估不同年龄火炬松物种沿树干的锥度和体积行为。由于火炬松在巴西南部的林业中被广泛用作原材料来源,这项工作的重点是火炬松人工林。该数据集由一组体积剖面组成,沿着树干进行相对直径测量,用于传统的森林清查。通过积分Preussner锥函数获得的树木总体积通过将树干分为四部分来等式,其中拟合了抛物线,并与Schöpfer的五次多项式、Kozak和Max Burkhart的函数估计的总体积和可销售体积进行了比较。结果:应用Kozak模型和Preussner模型的AIC和BIC,Bias、RMSE和r总体上较好。就总体积而言,Kozak和Preussner这两个函数都提供了可靠的估计。Preussner提出的程序的优点是拟合锥函数的灵活性,通过积分进行体积计算的简单性,以及解释其系数的可行性。
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来源期刊
CiteScore
2.20
自引率
13.30%
发文量
20
审稿时长
39 weeks
期刊介绍: The New Zealand Journal of Forestry Science is an international journal covering the breadth of forestry science. Planted forests are a particular focus but manuscripts on a wide range of forestry topics will also be considered. The journal''s scope covers forestry species, which are those capable of reaching at least five metres in height at maturity in the place they are located, but not grown or managed primarily for fruit or nut production.
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