Assessment of a monthly data structure for growth and yield projections from early to harvest age in hybrid eucalypt stands

Casas, Gianmarco Goycochea and Soares, Carlos Pedro Boechat and de Oliveira, Márcio Leles Romarco and Binoti, Daniel Henrique Breda and Fardin, Leonardo Pereira and Limeira, Mathaus Messias Coimbra and Zool Hilmi Ismail, . and da Silva, Antonilmar Araújo Lopes and Leite, Hélio Garcia (2023) Assessment of a monthly data structure for growth and yield projections from early to harvest age in hybrid eucalypt stands. Pertanika Journal Tropical Agricultural Science (Malaysia), 46 (4). 1127 -1150. ISSN 1511-3701

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.

Full text available from: Official URL: http://www.pertanika.upm.edu.my/resources/files/Pe...

Abstract

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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Item Type:	Article
AGROVOC Term:	plant growth
AGROVOC Term:	yield forecasting
AGROVOC Term:	data analysis
AGROVOC Term:	life cycle analysis
AGROVOC Term:	Eucalyptus urophylla
AGROVOC Term:	Eucalyptus grandis
AGROVOC Term:	computer programming
AGROVOC Term:	regression analysis
Geographical Term:	Brazil
Uncontrolled Keywords:	Buckman, clutter, deep learning, forest management, volumetric projection
Depositing User:	Ms. Azariah Hashim
Date Deposited:	17 Nov 2025 07:27
Last Modified:	17 Nov 2025 07:27
URI:	http://webagris.upm.edu.my/id/eprint/2518

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