Home / Regular Issue / JSSH Vol. 46 (2) May. 2023 / JTAS-2617-2022

 

Effects of Spacing on Early Growth Rate and Yield of Hybrid Eucalyptus Stands

Guilherme Luiz Fernandes, Gianmarco Goycochea Casas, Leonardo Pereira Fardin, Gilciano Saraiva Nogueira, Rodrigo Vieira Leite, Laercio Couto and Hélio Garcia Leite

Pertanika Journal of Social Science and Humanities, Volume 46, Issue 2, May 2023

DOI: https://doi.org/10.47836/pjtas.46.2.15

Keywords: Growth and yield modeling, harvest planning, mean annual increment, optimal harvest age

Published on: 16 May 2023

Optimizing tree spacing in a forest plantation is one of the main management techniques to improve stand quality and productivity. Its influence on growth from an early age is an important matter for forest management. This study aims to evaluate the effect of tree spacing on early growth rate and yield over time in Eucalyptus grandis × Eucalyptus camaldulensis hybrids. The data were obtained from an experiment in Itamarandiba, Minas Gerais, Brazil. The plots were composed of five planting spacing (3.00 m × 0.50 m, 3.00 m × 1.00 m, 3.00 m × 1.50 m, 3.00 m × 2.00 m, and 3.00 m × 3.00 m) measured at the ages of 7, 12, 24, 36, 48, 61, 77, 85, and 102 months. Growth and yield were analyzed by fitting the Gompertz model and a baseline exponential model up to 36 months of age to evaluate the influence of early growth on the harvest age. A Pearson correlation matrix was also generated to find out the relationship between the mean annual increment in the respective treatments during the studied period. It was observed that a positive correlation in the average annual increase in the 3 × 2 and 3 × 3 spacings. It was verified that tree spacing influenced the yielded wood volume and the optimal harvest age. The early growth rate influences the optimal harvest, which may explain a possible loss of yield during the productive cycle of the forest stand.

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