Modelagem do rendimento no desdobro de toras de Manilkara spp. (Sapotaceae) em serraria do estado de Roraima, Brasil

Danielli, Filipe Eduardo; Giménez, Bruno; Oliveira, Criscian Kellen Amaro de; Santos, Joaquim dos; Higuchi, Níro

doi:10.18671/scifor.v44n111.10

Cited by 16 publications

(21 citation statements)

References 7 publications

(10 reference statements)

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“…The use of beta regression in this study allowed such identification thus contributing in a precise way to the interpretation of results and shows an adequate performance of the model. Danielli et al (2016), while modelling the yield sawing logs of maçaranduba (Manilkara ssp.) obtained a determination coefficient around 0.80 for a nonlinear regression by considering the volume and the fine tip diameter.…”

Section: Discussionmentioning

confidence: 99%

Use of Beta Regression to Estimate the Volumetric Yield Coefficient in Logs of Native Species of the Legal Amazon

Mendoza

Borges

Morais

et al. 2019

NAT

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The research was developed at a logging site within the Legal Amazon and its main objective was to quantify the percent yield of the logging process for each species. In addition, the objective also included verifying the possibility of using the log's conicity to estimate their yield. Nine (9) logs were randomly selected from each of the 19 native species available at the sawmill, totalling 171 studied logs. The adopted methodology was based on a resolution from the Environmental National Council (CONAMA). Using the Software R, one beta regression model was developed based on the yield and conicity data. In the joint analysis of the data, the coefficient of volumetric yield (CVY), of all species was above the minimum required by current legislation. The use of the species and log's conicity as a functional dependence to estimate the yield of sawn wood showed high reliability, which justifies its application. Thus, the obtained statistical model may become a useful tool for the planning and management of the processing of logs from native species of the Legal Amazon.

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Section: Discussionmentioning

confidence: 99%

Use of Beta Regression to Estimate the Volumetric Yield Coefficient in Logs of Native Species of the Legal Amazon

Mendoza

Borges

Morais

et al. 2019

NAT

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“…This problems arises due to the fact that the logging sector in the Amazon region presents low productive performance due to the use of machines that have a low level of technology and workers that have little knowledge of the raw material with which they work (MELO et al, 2016). Furthermore, the level of utilization of raw material directly influences the forest area necessary for harvest to meet the demand for wood (DANIELLI et al, 2016). Therefore, the yield from the sawing of the logs in the sawmills is directly related to the sustainable use of forest resources since inefficient use of timber goes directly against the current worldwide preoccupation with sustainability and availability of natural resources.…”

Section: Sawmill Productivitymentioning

confidence: 99%

Harvesting and Processing of Native Wood From Upland Tropical Forests in Amapá, Eastern Amazonia

Figueira

Guedes

Euler

2020

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Knowledge about the activity of the timber sector and local industries assists in the management of a forest economy based on sustainable use in the Amazon. In this study, the situation of the timber sector of the municipality of Porto Grande-AP was examined to detail the extraction and processing of native wood from the Amazon and the sustainable use of this resource by the local sector. Forms were applied in all sawmills of the municipality, which collected information on factors of production and commercialization of native wood for the year 2017. In addition, interviews with local merchants were done and secondary data collection from several institutions related to the sector was conducted. All sawmills in the municipality exercise licensed activity and processed 69,300 m3 of wood in the period, with an average extraction of 21 m3/ha. The sawmills productive income was 55%, above of the 35%, maximum recently established by CONAMA. There is no destination for productive of residual waste generated by most sawmills and lumber is marketed mainly to the Northeast of Brazil for use in civil construction. Thus, in order to guarantee better economic and environmental performance of the sector, it is recommended that sawmills search for new forest areas as sources of raw material, participate in forest certification programs, and seek ways to use residual waste for bioenergy generation. The government recommends that new forests be managed through actions that solve land tenure problems and increase the supply of public forests, and for certified management units the recommendation is to reduce licensing costs, and simplify the bureaucratic processes of environmental agencies.

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“…A MEB foi determinada segundo a norma ABNT NBR 11941 (2003). O volume foi estimado pela diferença entre o volume comercial do fuste com e sem casca, a partir da sua cubagem rigorosa, seguindo o método de Smalian, conforme realizado por Danielli et al (2016). Para o volume comercial houve a relação entre a altura comercial (distância da base à ponta do fuste com diâmetro de oito centímetros) e os diâmetros da base, DAP, 25%, 50%, 75% e 100% da altura comercial.…”

Section: Materiais E Métodosunclassified

Estimativa da oferta de biomassa florestal em povoamentos de <i>Pinus taeda</i> L. após intervenções culturais

Ferreira

Stähelin²,

Jesus

et al. 2019

Ciênc. Florest.

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Com a determinação do quanto de biomassa florestal é gerada após as intervenções culturais é possível definir as áreas passíveis de exploração. Com isso, o objetivo do trabalho foi quantificar e estimar a oferta de biomassa de Pinus taeda L. disponível após as intervenções culturais. O experimento foi realizado em reflorestamentos nos municípios dos estados do Paraná e Santa Catarina, com idades de 3 anos (primeira desrama), 5 anos (segunda desrama), 7 anos (terceira desrama), 11 anos (primeiro desbaste) 19 anos (segundo desbaste), 23 e 33 anos (cortes rasos). Para cada idade foram amostradas 10 árvores e quantificados os componentes acículas, galhos, ponteira e casca. Após o corte raso, aos 23 anos houve maior disponibilidade de biomassa individual (372,6 kg.árv-1) e por unidade de área (144,4 t.ha-1), sendo composto principalmente por galhos (69,3%), seguido das acículas (17,9%), casca (11,0%) e ponteira (1,8%) por unidade de área. A correlação entre a massa dos componentes da biomassa por árvore e as variáveis independentes foi significativa e superior a 0,52. A menor correlação foi observada entre estas e a quantidade ofertada de ponteiras. Os modelos de regressão selecionados para estimar a massa de biomassa em função das variáveis independentes tiveram R²aju superiores a 83%, baixos desvios padrões e coeficientes de variação.

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Modelagem do rendimento no desdobro de toras de Manilkara spp. (Sapotaceae) em serraria do estado de Roraima, Brasil

Cited by 16 publications

References 7 publications

Use of Beta Regression to Estimate the Volumetric Yield Coefficient in Logs of Native Species of the Legal Amazon

Use of Beta Regression to Estimate the Volumetric Yield Coefficient in Logs of Native Species of the Legal Amazon

Harvesting and Processing of Native Wood From Upland Tropical Forests in Amapá, Eastern Amazonia

Estimativa da oferta de biomassa florestal em povoamentos de <i>Pinus taeda</i> L. após intervenções culturais

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