EQUAÇÕES HIPSOMÉTRICAS PARA Eucalyptus spp. NÃO MANEJADO EM IDADE AVANÇADA COM TÉCNICAS DE INCLUSÃO DE COVARIANTES

Oliveira, Gabriel Marcos Vieira; Mello, José Márcio de; Altoé, Thiza Falqueto; Scalon, João Domingos; Scolforo, José Roberto Soares; Pires, Júlio Vilela

doi:10.1590/01047760201521031740

Cited by 6 publications

(11 citation statements)

References 12 publications

(8 reference statements)

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“…For construction of a family of dominant height curves based on the average DBH, we proceeded according to the guide curve methodology (CLUTTER et al, 1983;BINOTI et al, 2012;RETSLAFF et al, 2015). For this purpose, the nonlinear function usually known as Chapman-Richards was used [1], which belongs to the so called biological functions, for their demonstrated flexibility for studies related to growth phenomenon (RICHARDS, 1959;OSUMI, 1983;VANCLAY, 1994;MARTÍNEZ PASTUR et al, 1997;CHAUCHARD, 2001;CARRERO et al, 2008;IVANCICH et al, 2011;ATTIS BELTRÁN et al, 2015;DO AMARAL MACHADO et al, 2015;OLIVEIRA et al, 2015). Where h dom : dominant height; a: parameter related to the asymptote of the function; b: parameter related to the rate of change; c: parameter linked to the inflection point; Da: average DBH.…”

Section: Modellingmentioning

confidence: 99%

DIAMETRIC SITE INDEX: AN ALTERNATIVE METHOD TO ESTIMATE SITE QUALITY IN Nothofagus obliqua AND N. alpina FORESTS

Beltrán

Chauchard

Velásquez

et al. 2016

CERNE

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ABSTRAT:The first step for constructing models of tree growth and yield is site quality assessment. To estimate this attribute, several methodologies are available in which site index (SI) is a standard one. However, this approach, that uses height at a reference age of trees, can be simplified if age is replaced by another reference variable easier to measure. In this case, the diametric site index (DSI) represents the mean height of dominant trees at a reference mean diameter at breast height. The aim of this work was to develop DSI in pure and mixed Nothofagus alpina and N. obliqua forests, and compare these models with the classical proposals based on height-age variables, within the temperate forest of northwestern Patagonia from Argentina, South America. Data originated from temporary plots and stem analyses were used. Tree age and diameter at breast height were obtained from each plot and used for establishing DSI family functions, following the guide-curve methodology. Site classes were proportionally represented among DSI curves of 17.0, 21.5, 26.0, 30.5 and 35.0 m of dominant tree height. Reference diameter instead of reference age can be cautiously used in order to fit site index models. ÍNDICE DE SÍTIO DIAMÉTRICO: UM MÉTODO ALTERNATIVO PARA ESTIMAR A QUALIDADE DO SÍTIO EM FLORESTAS DE Nothofagus obliqua E N. alpinaRESUMO: primeiro passo para a construção de modelos de crescimento e produção de árvores e a avaliação da qualidade do sítio. Para estimar este atributo, várias metodologias estão disponíveis, na qual o índice de sítio (IS) é padrão. No entanto, esta abordagem, que utiliza uma altura na idade de referência, pode ser simplificada se a idade é substituída por outra variável de referência mais fácil de medir. Neste caso, o índice de índice de sítio diamétrico (ISD) representa a altura média das árvores dominantes de um diâmetro à altura do peito referência. O objetivo deste trabalho foi desenvolver ISD para florestas puras e mistas de Nothofagus alpina e N. obliqua, e comparar esses modelos com as propostas clássicas baseadas nas variáveis altura-idade, para a floresta temperada do noroeste da Patagônia da Argentina, América do Sul. Dados provenientes de parcelas temporárias e análises de tronco foram utilizados. Foram obtidos idade e diâmetro à altura do peito de cada parcela e utilizados para o estabelecimento das funções da família DSI, seguindo a metodologia da curva-guia. Classes de sítio foram proporcionalmente representados entre curvas DSI de 17,0; 21,5; 26,0; 30,5 e 35,0 m de altura da árvore dominante. O diâmetro de referência em vez da idade de referência pode ser usado com cautela para ajustar modelos de índice de sítio.

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Section: Modellingmentioning

confidence: 99%

DIAMETRIC SITE INDEX: AN ALTERNATIVE METHOD TO ESTIMATE SITE QUALITY IN Nothofagus obliqua AND N. alpina FORESTS

Beltrán

Chauchard

Velásquez

et al. 2016

CERNE

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“…For instance, the following works all present height-diameter models for eucalyptus grown in Brazil using data from stands ages 8 years and younger: Ribeiro et al, 2010;Thiersch et al 2013;Miranda et al, 2014;Oliveira et al 2014;Mendonça et al, 2015;Souza et al, 2016. While there are some exceptions of studies dealing with older plantations (Azevedo et al, 2011;Oliveira et al, 2015) these are generally from small plantations that have not received active management operations (such as thinning or fertilization).…”

Section: Introductionmentioning

confidence: 99%

HEIGHT-DIAMETER MODELS FOR Eucalyptus sp. PLANTATIONS IN BRAZIL

Filho

Mola‐Yudego

Ribeiro

et al. 2018

CERNE

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HEIGHT-DIAMETER MODELS FOR Eucalyptus sp. PLANTATIONS IN BRAZILFERRAZ FILHO, A. C.; MOLA-YUDEGO, B.; RIBEIRO, A.; SCOLFORO, J. R. S.; LOOS, R. A.; SCOLFORO, H. F. Height-diameter models for Eucalyptus sp. plantations in Brazil. CERNE, v. 24, n. 1, p. 9-17, 2018. HIGHLIGHTSHeight-diameter models are provided for eucalyptus plantations in Brazil.A wide variety of stand conditions (age and tree densities) were covered in the database.Mixed modeling was used due to the hierarchical structure of the data (trees in plots).The models use diameter, age, and dominant height as predictor variables. ABSTRACTThe use of height-diameter models have important applications in the management of eucalyptus plantations. The aim of this paper is to provide adequate height models based on the diameter and stand variables that could be easily used and applied to plantation's management. The data was based on tests located in Espírito Santo and Bahia. A total of 312 plots, including 35 different treatments (different initial planting densities, number and severity of thinning operations, fertilization regimes, among others), and four different clones. This resulted in 2,407 conditions for 85,608 tree measurements. The constructed equations were based on mixed-effect models, in order to accommodate possible autocorrelations, to address variations between sites and to obtain locally calibrated estimates. Among the different model structures and combination of variables tested and presented, the best model showed a coefficient of determination of 0.953 and 0.988, for the fixed and fixed+random parts, respectively. The model included a random factor for measurements-within-tree and tree-within-plot. The bias of the fixed part was 0.208 cm (0.0659%). We believe the models in this study can have broad applications in management and inventory methods applied to plantations. HEIGHT-DIAMETER MODELS FOR EUCALYPTUS SP. PLANTATIONS IN BRAZIL 10 CERNEFERRAZ FILHO et al.

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“…O erro padrão variou de ± 1,94 m a ± 2,09 m ou ± 9,71% a ± 10,29%, entres os níveis de intensidade amostral analisados, com o erro padrão residual médio de ± 2,00 m ou ± 9,98% (Tabela 4). Os erros obtidos são inferiores aos obtidos por Oliveira et al (2015) 3,5107 -6,2926 0,76 1,98 9,97 -4512 3237,55* * Em que: β0, β1, β2 = parâmetros dos modelos estimados; R²aj. = Coeficiente de determinação ajustado; Sy.x = Erro padrão residual em m; Sy.x % = Erro padrão residual em percentagem; AICc = Critério de informação de Akaike; F = Distribuição F; * = significativo ao nível de significância de 0,05.…”

Section: Resultsunclassified