Modelagem da biomassa total e da lenha por unidade de área para bracatingais nativos

Souza, Ronan Felipe de; Machado, Sebastião do Amaral; Filho, Afonso Figueiredo

doi:10.1590/s0100-67622014000100005

Cited by 7 publications

(13 citation statements)

References 3 publications

(11 reference statements)

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“…and number of trees per hectare (N) are fundamental to describe the forests' structure and, consequently, are widely used for volume per area estimate, due to the good correlation and predictive potential (ADEKUNLE et al, 2004;OLIVEIRA et al, 2005;SOUZA et al, 2014. diversity in natural forests generate greater probability of occurring species of commercial interest, increasing, therefore, the timber production, as observed on this study. Nevertheless, the available evidence suggests that the positive relationship between species diversity and productivity depends, fundamentally, on the geographic scale and the ecological characteristics of the studied ecosystem (MITTELBACH et al, 2001).…”

Section: Selected Models By Stepwise Processmentioning

confidence: 60%

“…For this, Pearson's linear correlation coefficient (r) was calculated to identify the highest correlations among independent variables with total and exploitable volumes in its pure and in logarithm form, as employed by Souza et al (2014). The independent variables were tested untransformed, in logarithm, inverted, potentiated and combined, totalizing a 130 variables set.…”

Section: Volumetric Stock Modelingmentioning

confidence: 99%

“…Traditional commercial volumetric models (Table 1) were selected for modeling of the commercial volumes per unit of area (UNG and OUELLET, 1991;OLIVEIRA et al, 2005;SOUZA et al, 2014) and fitted through linear regression by software Action in Microsoft Office Excel (EQUIPE ESTATCAMP, 2014). These fitted models were compared to equations generated by Stepwise process.…”

Section: Volumetric Stock Modelingmentioning

confidence: 99%

“…Besides, Souza et al (2014), when modeling biomass from Mimosa scabrella Benth. in native stands, selected Spurr's combined variable model (model 5) among the most efficient to estimate the timber production per unit of area, the same result reached on this study for exploitable commercial volume.…”

Section: Traditional Modelsmentioning

confidence: 99%

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Modeling of the Commercial Volume Stock in an Ombrophilous Forest in the Southwest of the Amazon

Cysneiros

Machado

Pelissari

et al. 2016

CERNE

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ABSTRACT:The abundance of tree species in tropical rainforests with different shapes and dimensions, as well as the great structural diversity, makes difficult the employment of form factors or equations to estimate individual volumes. However, the employment of equations at the population level makes possible to predict the volumetric stock per unit of area from forest attributes, excluding the necessity of individual tree volume evaluation. Thereby, the aim of this study was to select variables, fit statistical models and propose stand equations to estimate total and exploitable commercial volumes in an Amazon forest under concession regime. For this, variables commonly measured, like density and basal area, were inserted on traditional commercial volume models; besides the application of variables that considered the diversity and forest structure on models generated by the Stepwise process. After analysis, it was observed that the models obtained through Stepwise propitiated more precise estimation of the volumetric stock, reducing estimation errors and reducing problems with heteroscedasticity of residuals. The insertion of variables that express diversity and forest structure on the equations, like Shannon's and diametric variation indices and the commercial trees ratio, contribute to predictions' improvement, especially for the exploitable commercial volume, being recommended for the precise evaluation of timber potential of areas under Amazon forest concession. MODELAGEM DO ESTOQUE VOLUMÉTRICO COMERCIAL EM UMAFLORESTA OMBRÓFILA NO SUDOESTE DA AMAZÔNIA RESUMO: Nas florestas tropicais, a abundância de espécies arbóreas em diferentes formas e dimensões, bem como a elevada diversidade estrutural, dificulta o emprego de fatores de forma ou de equações para a estimativa de volumes individuais. Contudo, o emprego de equações de povoamento possibilita predizer o estoque volumétrico por unidade de área a partir de atributos da floresta, excluindo a necessidade da avaliação individual do volume das árvores. Com isso, o objetivo deste estudo foi selecionar variáveis, ajustar modelos estatísticos e propor equações de povoamento para a estimativa do volume comercial total e explorável em uma floresta sob regime de concessão na Amazônia. Para isso, medidas comumente mensuradas, como a densidade e a área basal, foram empregadas em modelos tradicionais da literatura; além da aplicação de variáveis que consideraram a diversidade e a estrutura florestal em modelos gerados pelo processo Stepwise. Desse modo, os modelos obtidos por Stepwise propiciaram estimativas mais precisas dos estoques volumétricos, reduzindo os erros de estimativa e reduzindo problemas de heterocedasticidade dos resíduos. Além disso, a inserção de variáveis que expressam a diversidade e a estrutura florestal nas equações, como os índices de Shannon e de variação diamétrica e a razão de indivíduos comerciais, contribuiu para a melhoria das predições, sobretudo para o volume comercial explorável, sendo então recomendadas para a avaliação precisa do pote...

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Section: Selected Models By Stepwise Processmentioning

confidence: 60%

Section: Volumetric Stock Modelingmentioning

confidence: 99%

Section: Volumetric Stock Modelingmentioning

confidence: 99%

Section: Traditional Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of the Commercial Volume Stock in an Ombrophilous Forest in the Southwest of the Amazon

Cysneiros

Machado

Pelissari

et al. 2016

CERNE

Self Cite

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“…A boa performance estatística do modelo é superior quando comparada a outros trabalhos que buscaram modelar o crescimento de povoamentos monoculturais, tais como Padoin (2007), Bueno e Bevilacqua (2010) e Souza et al (2014). A análise gráfica (Figura 3a) mostra que os valores estimados são muito próximos aos valores reais de incremento.…”

Section: Res Ultados E Dis Cussãounclassified

MODELAGEM DO INCREMENTO DIAMÉTRICO DE Pinus taeda EM FUNÇÃO DE VARIÁVEIS DA COPA E ÍNDICES DE COMPETIÇÃO

Zimmermann¹,

Costa²,

Schröder³

2016

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ResumoObjetivou-se gerar um modelo de incremento periódico em área basal (IPAG) para Pinus taeda válido para povoamentos localizados no Rio Grande do Sul e Paraná. Foram instaladas parcelas temporárias em povoamentos de Cambará do Sul (RS) e Ponta Grossa (PR), em que a árvore de maior diâmetro foi considerada dominante na parcela. De todas as árvores, foi medido o diâmetro à altura do peito e altura total, e das dominantes foi medido também o diâmetro de copa, altura de inserção da copa e comprimento de copa, para o cálculo do grau de esbeltez, proporção de copa, formal de copa, índice de abrangência e saliência. Foi retirado um rolo de incremento de todas as árvores dominantes, para o cálculo do IPAG dos últimos cinco anos. O modelo foi construído pelo método stepwise, no pacote estatístico SAS® e validado pelas condicionantes da regressão. Foram selecionadas as variáveis diâmetro inicial, diâmetro de copa, grau de esbeltez e índice de competição baseado na área basal total e relativa. O modelo apresentou alto coeficiente de determinação e baixo erro padrão da estimativa, e a análise estatística não demonstrou diferença entre as curvas reais e estimada, evidenciando o uso do modelo em ambos os locais analisados e em locais semelhantes a eles. Palavras-chave: Árvore individual; método stepwise; relações morfométricas; incremento periódico anual em área basal. Abstract Diametric increment modeling of Pinus taeda in function of the crown variables and competition index.The objective was to generate a periodic annual basal area increment (IPAG) model for Pinus taeda valid for stands located in Rio Grande do Sul and Paraná. Temporary plots were installed in stands of Cambará do Sul and Ponta Grossa, where the tree larger diameter was considered dominant in the sample. All tree diameters at breast height and total height were measured. The dominant trees was also measured the crown diameter, crown insertion height and crown length to calculate h/d ratio, crown proportion, crown formal, coverage ratio and crown/trunk diameter ratio. An increment core was obtained from each dominant tree to calculate the IPAG the last five years. The model was built by stepwise method in the statistical package SA S® and validated by regression constraints. The variables initial diameter, crown diameter, degree of slenderness, and competition index based on the total and relative basal area were selected. The model showed high determination coefficient and low standard error of the estimate. The statistical analysis showed no difference between actual and estimated curves, showing the developed model may be used in both analyzed sites and similar sites. Keywords: Individual tree; stepwise method; morphometric relationships; periodic annual basal area increment. INTRODUÇÃOO uso de modelos de crescimento tem sido muito difundido co mo uma ferramenta au xiliar às decisões do manejo florestal, principalmente pela sua capacidade de prever e simular a produção madeireira futura. Entretanto, por ma is que exista uma gama de modelos já descrit...

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Prognosis of aboveground woody biomass in a central Brazilian Cerrado monitored for 27 years after the implementation of management systems

et al. 2021

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Accurate estimation of biomass in natural vegetation sites remains a challenge. Modeling biomass growth and production in Cerrado areas is crucial to understanding the vegetation succession process, especially regarding the changes in biomass accumulation over time. Thus, our objective was to model the growth and production of woody aboveground biomass (living and total) in a cerrado stricto sensu monitored for 27 years after implementing management systems. As expected, the basal area (with a diameter taken at 30 cm from the ground level) is the most important predictor variable and showed a higher correlation with the biomass stocks and allowed accurate and consistent estimates of these accumulated stocks over time. Future estimates of biomass production, generated from growth models that estimate production as a function of parameters observed at previous ages, indicate that maximum stocks of living (25.86 ± 0.15 Mg ha −1 [mean ± standard deviation]) and total aboveground biomass (26.11 ± 0.15 Mg ha −1 ) are expected for a period between 28 and 30 years after the implementation of the management systems, with maximum mean annual increment between 23 and 27 years. Furthermore, the systems of equations obtained simulated reductions up to 30% of biomass after the occurrence of a forest fire at 23 years. Thus, our study can be useful for the decision-making process and developing public policies and strategies for managing and conserving natural resources in the Cerrado biome.

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Modelagem da biomassa total e da lenha por unidade de área para bracatingais nativos

Cited by 7 publications

References 3 publications

Modeling of the Commercial Volume Stock in an Ombrophilous Forest in the Southwest of the Amazon

Modeling of the Commercial Volume Stock in an Ombrophilous Forest in the Southwest of the Amazon

MODELAGEM DO INCREMENTO DIAMÉTRICO DE Pinus taeda EM FUNÇÃO DE VARIÁVEIS DA COPA E ÍNDICES DE COMPETIÇÃO

Prognosis of aboveground woody biomass in a central Brazilian Cerrado monitored for 27 years after the implementation of management systems

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