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Assessment of a Monthly Data Structure for Growth and Yield Projections from Early to Harvest Age in Hybrid Eucalypt Stands

Gianmarco Goycochea Casas, Carlos Pedro Boechat Soares, Márcio Leles Romarco de Oliveira, Daniel Henrique Breda Binoti, Leonardo Pereira Fardin, Mathaus Messias Coimbra Limeira, Zool Hilmi Ismail, Antonilmar Araújo Lopes da Silva and Hélio Garcia Leite

Pertanika Journal of Tropical Agricultural Science, Volume 46, Issue 4, November 2023


Keywords: Buckman, clutter, deep learning, forest management, volumetric projection

Published on: 27 November 2023

Whole-stand Models (WSM) have always been fitted with permanent plot data organised in a sequential age-matched database, i.e., i and i+1, where i = 1, 2, ... N plot measurements. The objectives of this study were (1) to evaluate the statistical efficiency of a monthly distributed data structure by fitting the models of Clutter (1963), Buckman (1962) in the version modified by A. L. da Silva et al. (2006), and deep learning, and (2) to evaluate the possibility of gaining accuracy in yield projections made from an early age to harvest age of eucalypt stands. Three alternatives for organizing the data were analyzed. The first is with data paired in sequential measurement ages, i.e., i and i+1, where i = 1, 2, ... N plot measurements. In the second, all possible measurement intervals for each plot were considered, i.e., ii+1; i, i+2; ...; iN; i+1, i+2; ..., N-1, N. The third has data paired by month (j), always with an interval of one month, i.e., j, j+1; j+1, j+2; j+M-1, M, where M is the stand age of the plot measurement in months. This study shows that the accuracy and consistency of the projections depend on the organization of the monthly distributed data, except for the Clutter model. A better alternative to increasing the statistical assumptions of the forecast from early to harvest age is based on a monthly distributed data structure using a deep learning method.

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