Análise da mortalidade de &lt;i&gt;Acacia mearnsii&lt;/i&gt; De Wild.

Schneider, Paulo Renato; Fortes, Fabiano de Oliveira; Souza, Luis Henrique da Silva; Lúcio, Alessandro Dal’Col; Finger, César Augusto Guimarães

doi:10.5902/198050981831

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…These results clearly show that higher density initial spacing establishment presents higher mortality than lower densities. Higher mortality proportions found under higher density stands is consistent with other studies, such as Schneider et al (2005) and Leite et al (2006). This can be attributed to the lower competition suffered by trees under low densities.…”

Section: Mortalitysupporting

confidence: 92%

Thinning regimes and initial spacing for Eucalyptus plantations in Brazil

Filho

Mola‐Yudego

Scolforo

2018

An. Acad. Bras. Ciênc.

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This study focuses on the effects of different thinning regimes on clonal Eucalyptus plantations growth. Four different trials, planted in 1999 and located in Bahia and Espírito Santo States, were used. Aside from thinning, initial planting density, and post thinning fertilization application were also evaluated. Before canopy closure, and therefore before excessive competition between trees took place, it was found that stands planted under low densities (667 trees per hectare) presented a lower mortality proportion when compared to stand planted under higher densities (1111 trees per hectare). However, diameter growth prior to thinning operations was not statistically different between these two densities, presenting an overall mean of 4.9 cm/year. After canopy closure and the application of the thinning treatments, it was found that thinning regimes beginning early in the life of the stand and leaving a low number of residual trees presented the highest diameter and height growth. Unthinned treatments and thinning regimes late in the life of the stand (after 5.5 years), leaving a large number of residual trees presented the highest values of basal area production. The choice of the best thinning regime for Eucalyptus clonal material will vary according to the plantation objective.

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Section: Mortalitysupporting

confidence: 92%

Thinning regimes and initial spacing for Eucalyptus plantations in Brazil

Filho

Mola‐Yudego

Scolforo

2018

An. Acad. Bras. Ciênc.

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“…The results of the present study are consistent with the finding of Schneider et al (2005), who found that mortality of other species of the Acacia genus was highly correlated to the traits of growth, with values of Pearson correlation coefficients varying from 0.49 to 0.73. In the present study, survival had a weak association with growth (measured by the rankings); although high values of prediction for Murchinson River in El Tangue, indicate the possibility of joint selection mechanisms between both traits.…”

Section: Resultssupporting

confidence: 93%

“…In the present study, survival had a weak association with growth (measured by the rankings); although high values of prediction for Murchinson River in El Tangue, indicate the possibility of joint selection mechanisms between both traits. This result is relevant for this improvement program with A. saligna, as the genetic association between the growth rate and resistance to drought tends to be scarce, according to the studies by Coyle et al (2006) and Schneider et al (2005).…”

Section: Resultsmentioning

confidence: 94%

Genetic parameters of growth and survival in Acacia saligna shrubs

Mora¹,

Perret

Scapim

2010

Cienc. Inv. Agr.

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F. Mora, S. Perret, C.A. Scapim, and E. Arnhold. 2010. Genetic parameters for growth and survival in Acacia saligna shrubs. Cien. Inv. Agr. 37(2):5-14. Acacia species have valuable agronomic characteristics, such as the tolerance to unfavorable environmental conditions. In this study, genetic parameters and selection response in Acacia saligna shrubs were investigated in two arid environments of northern Chile: Cuz-Cuz and El Tangue. The quantitative traits were assessed in 5 year-old shrubs. A Bayesian approach, implemented using Gibbs sampling algorithm, was used in the data analysis. The tree survival was 87.3% and 81.8% in CuzCuz and El Tangue, respectively, confirming the potential of A. saligna in northern Chile. The estimates of posterior mode of the heritability ranged from h2=0.13 (survival) to h2=0.25 (shrub crown diameter). Estimated genetic gain (individual tree selection) ranged from 6 to 14% (selection intensity of 20%). Bayesian credible intervals (p=95%) for genotype-environment correlations included zero, indicating a significant interaction for survival, crown diameter and height. Shrub selection in multipurpose planting will depend on optimizing economical traits by selecting genotypes that perform well on a particular environment.

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“…Segundo Schneider et al (2005), agentes secundários como local, idade da árvore, espaçamento e condições climáticas influenciam a sobrevivência das árvores. A perda substancial em volume por árvore, na idade final, foi o que resultou em elevadas perdas na produção aos 92 meses.…”

Section: Modelounclassified

Crescimento de eucalipto sob efeito de desfolhamento artificial

Matrangolo

Castro

Lúcia

et al. 2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar os efeitos do desfolhamento total, realizado após o plantio e ao longo do primeiro ano de cultivo, sobre o crescimento de Eucalyptus grandis, desde a implantação até ao corte do povoamento. Foram avaliados cinco tratamentos: sem desfolhamento; um desfolhamento aos 56 dias após o plantio (DAP); dois desfolhamentos, aos 56 e 143 DAP; dois desfolhamentos, aos 56 e 267 DAP; e três desfolhamentos, aos 56, 143 e 278 DAP. Foram mensurados os diâmetros do tronco a 1,3 m e a altura total de 60 árvores por tratamento, em oito avaliações, do 21 o ao 92 o mês de cultivo. O crescimento médio em cada tratamento foi descrito por modelos de regressão não lineares e comparados por testes de identidade para comparar as tendências entre a testemunha e os demais tratamentos. O desfolhamento causou reduções significativas nas taxas de crescimento em diâmetro e altura das plantas, e diminuição expressiva no faturamento ao final da rotação, mesmo quando realizado uma única vez, no início do plantio. Maiores danos, no entanto, foram verificados após consecutivos desfolhamentos ao longo do primeiro ano de cultivo. A manutenção de áreas que tenham sofrido desfolhamento total na fase inicial de plantio pode tornar-se uma medida economicamente inviável.Termos para indexação: Eucalyptus grandis, modelos de crescimento, perdas econômicas, produtividade florestal. Eucalyptus growth under the effect of artificial defoliationAbstract -The objective of this work was to evaluate the effects of total defoliation at planting initial stages, and along the first year of cultivation, on Eucalyptus grandis growth, from planting to plantation cut. Five treatments were tested: without defoliation; one defoliation, at 56 th day after planting (DAP); two defoliations, at 56 th and 143 th DAP; two defoliations, at 56 th and 267 th DAP; and three defoliations, at 56 th , 143 th and 278 th DAP. Trunk diameter at 1.30-m height and the total height of 60 trees were measured from the 21 st to the 92 th cultivation months. The average growth of each treatment was described by nonlinear models and compared by identity tests in order to estimate the tendencies between control and the other treatments in each variable. Defoliation significantly reduces diameter of the trunk and height growth rates, and expressively decreases the income at the plantation cut. However, greater losses were verified after consecutive defoliation, along the first cultivation year. Maintaining areas that suffered severe defoliations at initial planting stages can become economically unfeasible.

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Análise da mortalidade de <i>Acacia mearnsii</i> De Wild.

Cited by 7 publications

References 2 publications

Thinning regimes and initial spacing for Eucalyptus plantations in Brazil

Thinning regimes and initial spacing for Eucalyptus plantations in Brazil

Genetic parameters of growth and survival in Acacia saligna shrubs

Crescimento de eucalipto sob efeito de desfolhamento artificial

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