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

Fernandes, G. L.; Casas, Gianmarco Goycochea; Fardin, Leonardo Pereira; Nogueira, Gilciano Saraiva; Leite, Rodrigo Viera; Couto, Laércio; Leite, Hélio Garcia

doi:10.47836/pjtas.46.2.15

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…The effect of competition between individuals is evident since the lowest tree densities produce the most significant individual growth, but this competition did not affect the harvest age, as no clear trends were observed throughout population densities. The relationship between spacing and optimal harvest age has been evaluated by several authors [63][64][65] observing varying responses, indicating the complexity of the association between silvicultural variables such as site quality or genetics.…”

Section: Productivity Per Hectarementioning

confidence: 99%

Impact of Thinning on the Yield and Quality of <em>Eucalyptus grandis</em> Wood at Harvest Time

Resquin,

Baez,

de Freitas

et al. 2024

Preprint

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To understand how the thinning strategies impacts on wood quality and quantity for different purposes is of interest, considering that the management of plantations is carried out with parameters that have yet to be validated for different growth conditions. This work evaluated contrasting thinning regimes applied early at two moments of the crop cycle. With an initial population of 840 trees.ha-1, two thinning with populations ranging from 700 to 400, and from 400 to 100 trees.ha-1 were applied at 1.5 and 7.3 years, respectively. Growth analyses were carried out from the ages of 1.5 to 20.8 years considering: total height, diameter at breast height, individual volume, total and commercial volume per hectare, mean annual increase and current annual increase. At final age, contrasting populations of 100, 250 and 400 trees.ha-1 were sampled to assess wood density, and mechanical properties (bending and compression on small scale clear samples). The values of individual growth and wood properties are related to a Stand Density Index to understand the effect of competition on those values. The results allow us to identify the thinning schemes that record the most significant individual and per-hectare growth (both in thinning and clear felling) and the optimal harvest time under specific growth conditions. We assessed the proportions of commercial logs for sawmill and pulp uses, providing valuable inputs for a subsequent economic analysis of thinning regimes seeking for the most convenient combination of wood products. Wood's physical and mechanical properties assessed were barely affected by contrasting levels of competition between trees, therefore the decision of the silvicultural system to implement will depend on production and economic criteria.

show abstract

Section: Productivity Per Hectarementioning

confidence: 99%

Impact of Thinning on the Yield and Quality of <em>Eucalyptus grandis</em> Wood at Harvest Time

Resquin,

Baez,

de Freitas

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The effect of competition between individuals is evident since the lowest tree densities produce the most significant individual growth, but this competition did not affect the harvest age, as no clear trends were observed throughout tree densities. The relationship between spacing and optimal harvest age has been evaluated by several authors [63][64][65] observing varying responses, indicating the complexity of the association between silvicultural variables such as site quality or genetics.…”

Section: Productivity Per Hectarementioning

confidence: 99%

Impact of Thinning on the Yield and Quality of Eucalyptus grandis Wood at Harvest Time in Uruguay

Resquin,

Baez,

de Freitas

et al. 2024

Forests

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Understanding how thinning strategies impact wood quality and quantity for different purposes is of interest, given that plantation management is often based on parameters that require validation under varying growth conditions. Planted forests for solid purposes in the northern region of Urugay, western Argentina and South of Brazil are usually managed in initial stockings ranging from 800 to 1200 trees·ha−1 depending on the use of clones or seeds. Subsequent thinnings are applied (at plantation ages varying from 3 to 11 years) up to final stockings of around 200 trees·ha−1. This study evaluated contrasting thinning regimes applied early in the crop cycle, with an initial tree density of 840 trees·ha−1. Two thinning treatments were applied at 1.5 and 7.3 years, reducing tree densities to 700–400 and 400–100 trees·ha−1, respectively. Growth analyses were conducted from 1.5 to 20.8 years, considering total height, diameter at breast height, individual volume, total and commercial volume per hectare, mean annual increase, and current annual increase. At the final harvest, contrasting tree densities of 100, 250, and 400 trees·ha−1 were sampled to assess wood density and mechanical properties (bending and compression on small-scale clear samples). Individual growth and wood properties were related to a Stand Density Index to understand the effect of competition on these values. The results identified thinning regimes that resulted in the most significant individual and per-hectare growth (both in thinning and clear felling) and the optimal harvest time under specific growth conditions. We assessed the proportions of commercial logs for sawmill and pulp uses, providing valuable inputs for subsequent economic analyses of thinning regimes aiming for the most convenient combination of wood products. Wood’s physical and mechanical properties were relatively little affected by contrasting levels of competition between trees; therefore, the choice of silvicultural system will depend on production and economic criteria.

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Sustaining plantation forest productivity in Sumatra over three decades: From acacias to eucalypts

Hardiyanto,

Inail,

Nambiar

et al. 2024

Forest Ecology and Management

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

Cited by 4 publications

References 30 publications

Impact of Thinning on the Yield and Quality of <em>Eucalyptus grandis</em> Wood at Harvest Time

Impact of Thinning on the Yield and Quality of <em>Eucalyptus grandis</em> Wood at Harvest Time

Impact of Thinning on the Yield and Quality of Eucalyptus grandis Wood at Harvest Time in Uruguay

Sustaining plantation forest productivity in Sumatra over three decades: From acacias to eucalypts

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