Original Article

Diametric Increment Patterns of Open-Grown and Under Competition Pinus taeda L. Trees in Southern Brazil


Graduate Program in Forest Engineering, Federal University of Santa Maria (UFSM), Rio Grande do Sul State, Brazil


Department of Forest Engineering, Federal University of Uberlândia (UFU), Minas Gerais State, Brazil


Graduate Program in Forest Engineering, Federal University of Lavras (UFLA), Minas Gerais State, Brazil


Graduate Program in Agroecosystems, Federal Technological University of Paraná (UFTPR), Paraná State, Brazil

FORESTIST 2022; 72: 105-111
DOI: 10.54614/forestist.2022.21031
Read: 497 Downloads: 241 Published: 11 May 2022

The main goal of this study was to evaluate the patterns of diametric increment of open-grown and under competition trees of Pinus taeda L. as an expression of breast height diameter. The dendrometric variables and the diameter increment of these trees were measured. The increments were obtained by measuring tree rings on cores extracted at breast height using a Pressler borer. An allometric model was fitted to describe the percentage periodic annual increment in diameter (PAId%) as a function of the initial diameter (di) for two tree groups. The analysis of covariance (ANCOVA) allowed comparing the effect of intercept (α0) and slope (α1) of the fitted equations between groups. The overall average of PAId5 was 0.83 cm year−1 for open-grown trees and 0.57 cm year−1 for under competition trees. The ANCOVA showed differences in intercept (α0) − (Pr > F = 0.0066) and not in slope (α1) − (Pr > F = 0.8883) for the adjusted regression equations. This finding enabled the development of a singular equation to express the increment, using dummy variables, described as: PAId% exp ln i  = + ´ - ( )+ é ë ê ù û ú 6 3725 0 7982 1 16212 0 1960 2 . . . . . D d , with R2 = .69 and Syx = 2.4%. The results of this study contribute to highlight the influences of the growth space in the increment of the species, as well as its maximum potential, elements that are very important for the monitoring and decision-making process in silvicultural activities of individual P. taeda trees.

Cite this article as: Schons, C. T., Costa, E. A., Barbosa, L. O., & Finger, C. A. G. (2022). Diametric increment patterns of open-grown and under competition Pinus taeda L. trees in southern Brazil. Forestist, 72(2), 105-111.

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