Conicity and Yield for Lumber From Commercial Species From the Amazon

Santos, Misael Freitas dos; Gama, João Ricardo Vasconcellos; Filho, Afonso Figueiredo; Costa, Daniele Lima da; Retslaff, Fabiane Aparecida de Souza; Ribeiro, Renato Bezerra da Silva; Rode, Rafael

doi:10.1590/01047760201925042648

Cited by 2 publications

(1 citation statement)

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“…Since the virtual credits are the functional currency of the DOF system, the monitoring agency will therefore consider that the remaining 1166.5 m³ of this unfulfilled conversion would still be available as unprocessed logs in the company's log deck. Given the variable mean volumetric yield among the sampled species, and among tropical Amazonian timber species in general (Mendoza et al 2019;Santos et al 2019;Lima et al 2020) it becomes clear that attributing a fixed value to CRV based on a general average does not match the reality of yield variations across the various aspects involved in industrial comercial timber production (multiple species, products and processing lines, among others). This makes the control process ineffective and may favor the illegal log trade.…”

Section: Discussionmentioning

confidence: 99%

Volumetric yield coefficient: the key to regulating virtual credits for Amazon wood

et al. 2023

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In Brazil, all transport and storage of native forest products and by-products must be registered within the DOF (Document of Forestry Origin) system. This computerized platform exists to support control agencies in reducing the sale of forest products obtained illegally. However, this tool still shows only modest results in fulfilling its objectives, since gaps in the system allow illegal wood to be acquired and enter the system as legal wood. The objective of this study was to test whether the volumetric yield coefficient (CRV) of a sawmill on an industrial scale corresponds to the 35% established by Brazilian legislation. The focus was directed at a loophole that allows the accumulation of virtual credits in the DOF system by turning logs into lumber. For this purpose, we estimated the sawmill’s CRV and mean percentage yield of 19 commercial species used by a timber company in the Brazilian Amazon with a sample size of 90 logs. The estimated CRV was 24.6 ± 2.4, showing 9.9% uncertainty. The mean CRV differed highly significantly (p < 0.001) from that proposed by the DOF, with a 10.35% difference. Based on these results, the difference between the observed yield and that proposed by the legislation can generate the accumulation of virtual log credits. With this accumulation, managers encounter difficulties in acquiring new logging permits and, consequently, do not meet the actual demand for logs to the sawmill’s capacity.

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Section: Discussionmentioning

confidence: 99%