Wood volume is overestimated in the Brazilian Amazon: Why not use generic volume prediction methods in tropical forest management?

Cardoso, Rodrigo Montezano; Miguel, Eder Pereira; de Souza, Hallefy Junio; de Souza, Álvaro Nogueira; Nascimento, Rodrigo Geroni Mendes

doi:10.1016/j.jenvman.2023.119593

Journal of Environmental Management

2024

DOI: 10.1016/j.jenvman.2023.119593

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Wood volume is overestimated in the Brazilian Amazon: Why not use generic volume prediction methods in tropical forest management?

Rodrigo Montezano Cardoso,

Eder Pereira Miguel,

Hallefy Junio de Souza

et al.

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2024

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Cited by 3 publications

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Solid Biofuel from the Amazon: A Circular Economy Approach to Briquette Production from Wood Waste

Vilas Boas,

Zanuncio,

Neiva

et al. 2024

Forests

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The Amazon region contains numerous areas dedicated to sustainable timber extraction. This operation has low yields and generates a large amount of waste. However, this waste can be repurposed for energy generation, providing income for locals and reducing reliance on non-renewable energy sources prevalent in the region. This study aimed to assess the impact of torrefaction on various wood residues for briquette production. Wood residues from Mimosa scabrella Benth (Bracatinga), Dipteryx odorata (Aubl.) Willd. (Cumaru), and Aspidosperma populifolium A.DC. (Peroba mica) were torrefied at temperatures ranging from 180 to 220 °C for sixty minutes under a nitrogen atmosphere. Briquettes were produced using laboratory equipment with loading pressures between 7 and 14 MPa. Torrefied particle properties were evaluated based on proximate composition and calorific value tests, while briquette quality was assessed for physical and mechanical properties. The results demonstrated the briquetting potential of different wood species before and after torrefaction, with optimal outcomes achieved by torrefaction at 220 °C due to its enhancement of energy density. Briquettes showed optimal characteristics at compression pressures of 14 MPa, resulting in increased density (between 1.10 and 1.24 g·cm−3) and compression strength (between 7.20 and 21.02 MPa). The ash values were low and met the requirements. The utilization of waste for briquette production offers a significant alternative for energy generation in economically disadvantaged communities, while also enabling the replacement of non-renewable energy sources.

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Solid Biofuel from the Amazon: A Circular Economy Approach to Briquette Production from Wood Waste

Vilas Boas,

Zanuncio,

Neiva

et al. 2024

Forests

View full text Add to dashboard Cite

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Determinants of Financial Viability of Forest Concession in Brazilian Amazon

Lima,

Souza,

Matricardi

et al. 2024

Forests

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This study aimed to assess the financial viability of forest concessions in the state of Pará, Brazil. Two Forest Management Units (FMUs) were analyzed: FMU-2, located in Saracá-Taquera National Forest, and FMU-3, located in Caxiuanã National Forest. Financial indicators were evaluated under different timber productivity scenarios (20 m3/ha and 25.8 m3/ha). At a logging intensity of 20 m3/ha, FMU-2 was not financially viable. However, both FMUs were financially viable at 25.8 m3/ha. Sensitivity analysis demonstrated that FMU-2 requires a logging intensity of over 22 m3/ha and a sawmill yield efficiency of at least 45%. The ideal cost for sawn wood would be USD 226.53/m3, with royalties of USD 16.00/m3. FMU-3 consistently demonstrated positive financial results, despite fluctuations in production costs. The financial viability of investing in forest concessions in state of Pará depends largely on forest productivity, sawmill yield, royalties, and sawn wood costs.

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Generic and Specific Models for Volume Estimation in Forest and Savanna Phytophysiognomies in Brazilian Cerrado

Souza,

Miguel,

Lima

et al. 2024

Plants

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The Cerrado has high plant and vertebrate diversity and is an important biome for conserving species and provisioning ecosystem services. Volume equations in this biome are scarce because of their size and physiognomic diversity. This study was conducted to develop specific volumetric models for the phytophysiognomies Gallery Forest, Dry Forest, Forest Savannah, and Savannah Woodland, a generic model and a model for Cerrado forest formation. Twelve 10 m × 10 m (100 m²) (National Forest Inventory) plots were used for each phytophysiognomy at different sites (regions) of the Federal District (FD) where trees had a diameter at breast height (DBH; 1.30 m) ≥5 cm in forest formations and a diameter at base height (Db; 0.30 m) ≥5 cm in savanna formations. Their diameters and heights were measured, they were cut and cubed, and the volume of each tree was obtained according to the Smalian methodology. Linear and nonlinear models were adjusted. Criteria for the selection of models were determined using correlation coefficients, the standard error of the estimates, and a graphical analysis of the residues. They were later validated by the chi-square test. The resultant models indicated that fit by specific phytophysiognomy was ideal; however, the generic and forest formation models exhibited similar performance to specific models and could be used in extensive areas of the Cerrado, where they represent a high potential for generalization. To further increase our understanding, similar research is recommended for the development of specific and generic models of the total volume in Cerrado areas.

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Wood volume is overestimated in the Brazilian Amazon: Why not use generic volume prediction methods in tropical forest management?

Cited by 3 publications

References 28 publications

Solid Biofuel from the Amazon: A Circular Economy Approach to Briquette Production from Wood Waste

Solid Biofuel from the Amazon: A Circular Economy Approach to Briquette Production from Wood Waste

Determinants of Financial Viability of Forest Concession in Brazilian Amazon

Generic and Specific Models for Volume Estimation in Forest and Savanna Phytophysiognomies in Brazilian Cerrado

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