Influência do comprimento de copa na relação hipsométrica de Araucaria angustifolia

Machado, Sebastião do Amaral; Accioly, Yuri; Nascimento, Rodrigo Geroni Mendes; Silva, Luís César Rodrigues da; Cardozo, Claudia Carla

doi:10.4336/2015.pfb.35.83.493

Cited by 6 publications

(7 citation statements)

References 2 publications

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“…The effect of stand density on the height-diameter relationship was evaluated by Silva et al (2016), who found an accuracy reduction of the height estimates of Tectona grandis L. F., for wider spacings; similar results were found by Bartoszeck et al (2004). Concerning the effect of the variables sociological position and crown length, Costa et al (2014) and Machado et al (2015) found height-diameter equations with better statistical performance fitted into sociological position and crown length classes, respectively.…”

Section: Introduction and Objectivesmentioning

confidence: 66%

“…The height-diameter relationship is susceptible to several factors, such as site quality (Retslaff et al, 2015;Vendruscolo et al, 2015), age (Machado et al, 2011;Paulo et al, 2011;Soares & Tomé, 2002;Téo et al, 2017), stand density (Araújo et al, 2012;Silva et al, 2016;Téo et al, 2017), crown size (Machado et al, 2015), species (Azevedo et al, 2011;Donadoni et al, 2010;Hess et al, 2014;Sanquetta et al, 2013) and the sociological position of the trees (Costa et al, 2014;Leduc & Goelz, 2009;Martins et al, 2016). Retslaff et al (2015) reported that the use of the variables dominant height and site index produced height-diameter equations with more homogeneous and narrow residues distribution.…”

Section: Introduction and Objectivesmentioning

confidence: 99%

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General Height-Diameter Equation Depending on the Stand Variables, for Eucalyptus benthamii

Téo

Silva

2020

Floresta Ambient.

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The aim of this study was to develop a general applicability equation to represent the hypsometric relationship of Eucalyptus benthamii Maiden et Cambage stands in Irani, Santa Catarina. The data came from a continuous forest inventory, with a simple random sampling design and the Bitterlich method. The functions to represent the hypsometric relationship were adjusted with their parameters linear function of stands variables, based on the Gauss-Newton algorithm. The models were evaluated according to the criteria of adjustment and precision, accuracy and validation. In general, the Harrison model, adjusted with the coefficient "c" linear function of age, dominant diameter and basal area, presented the best statistical performance to represent the hypsometric relationship of Eucalyptus benthamii.

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Section: Introduction and Objectivesmentioning

confidence: 66%

Section: Introduction and Objectivesmentioning

confidence: 99%

General Height-Diameter Equation Depending on the Stand Variables, for Eucalyptus benthamii

Téo

Silva

2020

Floresta Ambient.

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“…Machado et al (2015), found improvement in fit and precision of h/d models when separating Araucaria trees in crown length classes. They also found that Araucarias with larger crown lengths tend to be taller and thicker.…”

Section: Discussionmentioning

confidence: 99%

The crown efficiency of Parana-Pine

2017

Aust. J. Basic & Appl. Sci.

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Background:Araucaria angustifolia has high-quality wood, variability and ecological adaptation to environmental conditions. In most cases, the crown efficiency expresses the capacity of tree growth and can be described by the ratio between the increment in basal area with its crown projection area. This measure allows determining the growth capacity of each tree to be removed during a thinning. Objective: This study evaluated the crown efficiency of Araucaria angustifolia trees, according to the sociological position: dominant, codominant, dominated and open grown trees. Results: The relationship between crown efficiency and crown projection area for trees of three social positions in the forest and open growth trees shows the reduction of efficiency with the increase of crown projection area. Open grown trees are more efficient, followed by dominant, codominant and dominated. The inclusion of variable of the crown length in model of efficiency provided best values of the adjustment and accuracy, except in model the dominated trees, that did not alter in reason of the higher competition, low vigor and luminosity to which the crown is submitted. In open growth trees, the increase in value R² was of 51.6%, confirming the dependence of the variable of crown length on the explanation of the crown efficiency. Conclusion: Trees with better sociological position in stand have more efficient crown, as the crown length increases. Narrow and long crowns are more productive, grow in smaller spaces, and permit greater number of trees per area unit. For maximize the production per area unit, the forest management should be based on specific conditions of the trees. This specie needs light for its development and silvicultural activities are necessary to be conserved in nature. This research will improve silvicultural activities and economic planning of araucaria in southern Brazil.

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“…A escolha da melhor equação hipsométrica ajustada, para o conjunto dos dados, foi realizada com base nos critérios do erro padrão da estimativa em percentagem (S yx %) e do coeficiente de determinação ajustado em percentagem (R²aj%). Nos casos de equações logaritmizadas, visto que essas equações tendem a subestimar os valores da altura, utilizou-se um fator de conversão, visando corrigir esse erro, por meio da multiplicação das alturas estimadas pelo Fator de Meyer (FM) para recalcular o erro padrão da estimativa, conforme descrito por Machado et al (2015). Já o índice de ajuste de Schulaegel (IA) foi utilizado visando permitir a comparação com o coeficiente de determinação ajustado (R²aj%) das equações de diferentes naturezas (MACHADO et al, 2015).…”

Section: Avaliação E Escolha Dos Modelosunclassified

Modelos De Relação Hipsométrica Por Classe De Aproveitamento Em Floresta De Transição Cerrado-Amazônia No Mato Grosso

Curto¹,

Wink²,

Araújo³

et al. 2018

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RESUMO Em vista das normas dos Planos de Manejo Florestal Sustentável, este trabalho teve como objetivo verificar a identidade de modelos de relação hipsométrica em diferentes classes de aproveitamento em fitofisionomia de Floresta de Transição Cerrado-Amazônia. O estudo foi realizado no Parque Florestal de Sinop, em Sinop, Mato Grosso. Avaliou-se aleatoriamente o diâmetro a altura do peito e a altura total de 96 árvores distribuídas nas classes de regeneração (10 a 29,9 cm), remanescentes (30 a 49,9 cm) e de corte (>50 cm). Posteriormente realizou-se o ajuste e avaliação qualitativa de modelos de relação hipsométrica, por meio de diferentes estatísticas. As equações hipsométricas estratificadas por classe de aproveitamento resultam em aumento da precisão quando trata-se de árvores nas classes de regeneração (10 a 29,9 cm de DAP) e de corte (> 50 cm). Quanto a identidade de modelos, é possível o agrupamento de árvores nas classes regeneração com as remanescentes, e agrupamento de árvores remanescentes com árvores da classe de corte, para realização simultânea dos ajustes. Pela estratificação e aumento de precisão, pode-se reduzir o tempo de coleta de dados e os custos envolvidos na atividade, com a redução da intensidade amostral. PALAVRAS-CHAVE: altura, custo, identidade de modelos.

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Influência do comprimento de copa na relação hipsométrica de Araucaria angustifolia

Cited by 6 publications

References 2 publications

General Height-Diameter Equation Depending on the Stand Variables, for Eucalyptus benthamii

General Height-Diameter Equation Depending on the Stand Variables, for Eucalyptus benthamii

The crown efficiency of Parana-Pine

Modelos De Relação Hipsométrica Por Classe De Aproveitamento Em Floresta De Transição Cerrado-Amazônia No Mato Grosso

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