Eucalyptus growth and yield system: Linking individual-tree and stand-level growth models in clonal Eucalypt plantations in Brazil

Scolforo, Henrique Ferraço; McTague, J. P.; Burkhart, Harold E.; Roise, Joseph; Campoe, Otávio Camargo; Stape, José Luiz

doi:10.1016/j.foreco.2018.08.045

Cited by 41 publications

(14 citation statements)

References 12 publications

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“…Accurate modeling of individual tree volume and shape of the tree bole is critical in order to maximize the level of information provided by the forest inventory. When the growth and yield system contains tree diameters at breast height, the individual tree volume models are useful to update inventories and forecast yields (Casnati 2016, Scolforo et al 2019. In this study, we developed generalized stem taper, total tree volume and volume ratio equations for clonal eucalyptus in Brazil.…”

Section: Discussionmentioning

confidence: 99%

Generalized stem taper and tree volume equations applied to eucalyptus of varying genetics in Brazil

et al. 2019

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Lack of generalized equations has prevailed in Brazil, because it is assumed that localized or climate-specific equations are needed. This study aimed to develop generalized stem taper and volume equations applicable to 11 eucalyptus clones and evaluate if climate variation impacts the accuracy of the estimates. A total of 693 trees evenly distributed across 11 clones at 21 sites were used for model fittings and predictive validation. The penalized mixed spline (PMS) approach was developed for predicting stem taper and volume along the stem profile. The Schumacher and Hall (1933) equation was used to predict total tree volume, while volume ratio equations were applied to predict merchantable volume. For every fitted equation, an annual climatic variable was included to assess the improvement in model performance. The overall results highlighted that climatic variation does not need to be accounted for in stem taper and volume modeling. All of the equations displayed desirable accuracy, but the generalized PMS equation may be preferred when the forestry enterprise looks to furnish a range of multiple forest products. The generalized total tree volume equation, combined with the ratio equations, is highly recommended when the forestry enterprise produces a single product.

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Section: Discussionmentioning

confidence: 99%

Generalized stem taper and tree volume equations applied to eucalyptus of varying genetics in Brazil

et al. 2019

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“…In this study, we used 1000 random samples with repetition generated from the non-parametric bootstrapping technique to evaluate modeling accuracy. This technique was employed by [5], who indicated that it worked well, particularly with extreme cases.…”

Section: Validationmentioning

confidence: 99%

“…Hence, forest growth and yield systems that are able to predict the effect of different silvicultural practices on stand growth are essential tools needed to guide operational decision-making [2]. Systems with enough flexibility to estimate forest productivity, under a variety of silvicultural practices and management regimes, are available in the literature for common production species [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Modeling Volume Response from Mid-Rotation Fertilization of Pinus taeda L. Plantations

Scolforo

Montes

Cook

et al. 2020

Forests

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Mid-rotation fertilization presents an opportunity to increase the economic return of plantation forests in the southeastern United States (SEUS). For this reason, the Forest Productivity Cooperative established a series of mid-rotation fertilization trials in Pinus taeda L. plantations across the SEUS between 1984 and 1987. These trials identified site-specific responses to nitrogen (N) and phosphorus (P) fertilizers, resulting in increased stand production for 6–10 years after fertilization. There are successful volume response models that allow users to quantify the gain in stand productivity resulting from fertilization. However, all the current models depend on empirical relationships that are not bounded by biological response, meaning that greater fertilizer additions continue to create more volume gains, regardless of physiological limits. To address this shortcoming, we developed a bounded response model that evaluates relative volume response gain to fertilizer addition. Site index and relative spacing are included as model parameters to help provide realistic estimates. The model is useful for evaluating productivity gain in Pinus taeda stands that are fertilized with N and P in mid-rotation.

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“…Os modelos ajustados ppor esse autor para estimar probabilidade da mortalidade, incremento em diâmetro e incremento em altura total apresentaram-se adequados para composição de todo o sistema de modelagem ao nível de árvore individual. Scolforo et al (2019) desenvolveram um modelo compatível de árvores individuais e modelo global para plantios clonais de Eucalipto distribuídos em quatorze sítios distintos do Brasil. De acordo com os resultados apresentados, os modelos de árvores individuais geraram estimativas acuradas.…”

Section: Introductionunclassified

PREDIÇÃO DA PRODUÇÃO DE MULTIPRODUTOS EM NÍVEL DE ÁRVORE INDIVIDUAL DE Pinus taeda L.

Cavalheiro

Machado²,

Filho³

et al. 2021

BIOFIX

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Modelos de árvores individuais permitem o maior nível de detalhamento possível da estrutura florestal e estudos recentes mostram que ainda existem lacunas de conhecimento principalmente quando se planeja obter a segmentação em multiprodutos. O objetivo deste trabalho foi ajustar um modelo completo de árvores individuais para estimar os volumes por sortimentos em plantios de Pinus taeda localizados no planalto norte do estado de Santa Catarina. O ajuste do sistema foi baseado nas remedições de 345 parcelas permanentes. Para estimativa dos sortimentos utilizou-se o modelo de Schoepfer (1966) e a cubagem rigorosa de 360 árvores. A mortalidade por hectare foi estimada a partir do ajuste do modelo de Buchman. O índice de competição independente da distância utilizado foi o de Stage (1973). O modelo proposto por Qin & Cao (2006) foi ajustado para projeção do diâmetro à altura do peito e altura total. Para a avaliação dos modelos, foram utilizadas o coeficiente de determinação ajustado (R²adj), erro padrão da estimativa e análise gráfica de resíduos. Utilizou-se o teste de Mann-Whitney para avaliar se os volumes estimados apresentam igualdade estatística quando comparados com os volumes observados. Os resultados do ajuste probabilidade de mortalidade foram um R2adj = 0,623 e SYX% = 41,9. Os modelos de estimativas de diâmetro e altura total apresentaram respectivamente um R2adj = 0,987, R2adj = 0,963 e SYX% =2,22, SYX% =4,04. O volume foi superestimado para todos os sortimentos em média 43,6 m3.ha-1 (29,8%). Quanto a acurácia os volumes diferiram em média em 45,6 m3.ha-1 (31,3%) dos volumes reais. O resultado do teste de Mann- Whitney mostrou que existiu diferença estatística entre os valores observados e estimados. O sistema de árvores individuais construído não apresenta projeções precisas e acuradas. Também gera-se estimativas que diferem estatísticamente dos volumes observados para todos os sortimentos.

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Eucalyptus growth and yield system: Linking individual-tree and stand-level growth models in clonal Eucalypt plantations in Brazil

Cited by 41 publications

References 12 publications

Generalized stem taper and tree volume equations applied to eucalyptus of varying genetics in Brazil

Generalized stem taper and tree volume equations applied to eucalyptus of varying genetics in Brazil

A New Approach for Modeling Volume Response from Mid-Rotation Fertilization of Pinus taeda L. Plantations

PREDIÇÃO DA PRODUÇÃO DE MULTIPRODUTOS EM NÍVEL DE ÁRVORE INDIVIDUAL DE Pinus taeda L.

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