Caracterização do setor madeireiro de Rorainópolis, sul de  Roraima

Crivelli, Bruno Roberto de Sousa; Gomes, Jefferson Peixoto; Morais, Weslley Wilker Corrêa; Condé, Tiago Monteiro; Santos, Raylanne de Lima; Filho, Osmar Serra Bonfim

doi:10.12953/2177-6830/rcm.v8n3p142-150

Cited by 4 publications

(7 citation statements)

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“…An analysis of the horizontal structure in Ds showed that the three tree species with the greatest importance value (IV%) in descending order were Manilkara excelsa (11.7%), Qualea brevipedicellata (8.2%) and Goupia glabra (5.2%), exploited commercially in the region in the DL and PSFM categories (CONDÉ;TONINI, 2013;GIMENEZ et al, 2015;CRIVELLI et al, 2017). In LOt 1 , Manilkara huberi (Ducke) (35.2%), Qualea brevipedicellata (13.3%) and Dinizia excelsa (10.1%) had the highest IV values, while in LOt 2 , Manilkara excelsa (35.4%), Dinizia excelsa (10.7%) and Cordia glabrata (3.8%) had the highest IV values (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…The supply of tropical wood in Brazil from the Amazon has historically generated enormous economic revenue, but generally has not been sustainably regulated to guarantee maintenance of the forest structure and associated environmental services such as forest carbon stock, maintenance of the hydrological cycle and the genetic biodiversity of the flora (GIMENEZ et al, 2015;CRIVELLI et al , 2017;GAUI et al, 2019). In the context of timber extraction in the state of Roraima, there was a large amount of forest exploitation from 2011 to 2016, a result of deforestation licences (DL) issued by the State Foundation for the Environment and Water Resources of Roraima (FEMARH) in relation to plans for sustainable forest management (PSFM) (CONDÉ et al , 2019), revealing how Roraima public policies aimed at promoting sustainable multi-use forest management, which makes it possible to exploit timber and non-timber products in harmony with nature and the Earth's climate balance, are still in the early stages.…”

Section: Introductionmentioning

confidence: 99%

“…A oferta de madeira tropical no Brasil oriunda da Amazônia historicamente tem gerado enorme receita econômica, porém, normalmente, não tem sido regulada sustentavelmente pelo homem para garantir a manutenção da estrutura florestal e serviços ambientais associados, como o estoque de carbono florestal, a manutenção do ciclo hidrológico e a biodiversidade genética da flora (GIMENEZ et al, 2015;CRIVELLI et al, 2017;GAUI et al, 2019). No contexto do extrativismo madeireiro do estado de Roraima, durante o período de 2011 a 2016, ocorreu grande exploração florestal oriunda de autorizações de desmatamento (AD's) emitidas pela Fundação Estadual do Meio Ambiente e Recursos Hídricos de Roraima (FEMARH) em relação aos planos de manejo florestal sustentável (PMFS) (CONDÉ et al, 2019), revelando como ainda são incipientes as políticas públicas roraimenses destinadas ao fomento do manejo florestal sustentável de uso múltiplo, que possibilita a exploração de produtos madeireiros e não madeireiros em harmonia com a natureza e o equilíbrio climático da Terra.…”

Section: Introductionunclassified

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Phytosociology and the timber potential of transitional ecosystems from forested campinarana to dense forest in the south of Roraima, Brazil

Condé¹,

Borges²,

Costa³

et al. 2022

AGRO@MBIENTE ON-LINE

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Transitional forest ecosystems in the south of the state of Roraima show great heterogeneity of tree species and represent different volumes of timber stock in projects of vegetation suppression requiring Deforestation Licences (DL). The aim of this study was to evaluate the phytosociology and standing timber volume in ecosystems of Submontane Dense Ombrophilous Forest (Ds) and transitional Campinarana/Ombrophilous Forest (LOt1 and LOt2) in the district of Rorainópolis, Roraima. The DL were issued and authorised from 2011 to 2016 by the State Foundation for the Environment and Water Resources of Roraima (FEMARH) and the Brazilian Institute of the Environment and Renewable Natural Resources (IBAMA). A total of 9,391 timber-yielding trees were analysed, with a DBH ≥ 45 cm in 646.5 hectares; these belonged to 21 botanical families, 73 species and 8 taxa identified at the genus level. Diversity and evenness were greater in Ds (H’ = 3.34; J = 0.82) compared to LOt (H’ = 1.92 to 2.20; J = 0.55). The floristic similarity was greater between Ds and LOt2, of different forest typologies, showing that transitional environments can be complex in terms of floristic composition and diversity. However, the larger volumes of timber stock in LOt1 and LOt2 compared to Ds may be related not only to natural processes, but also to the influence of deforestation and illegal selective logging in the surrounding area. There is a strong need for studies on transitional forest ecosystems in the Amazon, due to the complexity of the ecological relationships, the influence of environmental gradients, and anthropogenic factors.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionunclassified

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Phytosociology and the timber potential of transitional ecosystems from forested campinarana to dense forest in the south of Roraima, Brazil

Condé¹,

Borges²,

Costa³

et al. 2022

AGRO@MBIENTE ON-LINE

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“…The increase in forest fires in the Amazon in recent decades is strongly related to the drought-fire interaction, due to the high flammability of dry vegetation in the El Niño years, associated with the indiscriminate use of fire by humans. The increase in selective logging in Amazonia [7], to the detriment of the fall in deforestation rates (2004 to 2012) [3,44], has led to sawmills receiving an alternative constant supply of unauthorized timber [23][24][25]45]. This has been possible, because it is virtually invisible to low spatial resolution sensors (MODIS, Landsat, etc.)…”

Section: Discussionmentioning

confidence: 99%

“…The altitude of the region is higher than 65 meters, favoring the occurrence of some of the most exploited timber species in Roraima, such as "maçaranduba"-Manilkara huberi (Ducke) A. Chev. and "angelim-ferro"-Dinizia excelsa Ducke [8,27,33,45]. Estimates of the mean tree density per hectare and the mean forest carbon stock per hectare from this forest inventory (FI) should be restricted to transitional ecosystems or ecotones (forest areas: LOt, between Ld/Ds) only, and should not be applied to campinarana ecosystems (non-forested areas: Lg, Lb, La) on the whole of Flona Anauá.…”

Section: Discussionmentioning

confidence: 99%

Illegal Selective Logging and Forest Fires in the Northern Brazilian Amazon

Condé

Higuchi

Lima

2019

Forests

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Illegal selective logging and forest fires occur on a large scale in the northern Brazilian Amazon, contributing to an increase in tree mortality and a reduction in forest carbon stock. A total of 120 plots of 0.25 ha (30 ha) were installed in transitional ecosystems or ecotones (LOt) between the forested shade-loving campinarana (Ld) and dense-canopy rainforest, submontane (Ds), in the National Forest (Flona) of Anauá, southern Roraima. Measuring the diameters at breast height (DBH ≥ 10 cm) and the heights of 171 dead trees (fallen naturally, illegally exploited, and affected by forest fires), enabled the estimation of carbon content from the application of a biomass equation developed at Manaus, and the calculation of a correction factor, using the average height of the largest trees. From 2015-2017, we mapped the real extent of illegal selective logging and forest fires across the region with CLASlite and INPE/Queimadas. From measurements of 14,730 live and dead trees across 30 hectares (491 ± 15 trees·ha −1 ), the illegal selective logging and associated forest fires, and aggravation by severe El Niño droughts resulted in an 8.2% mortality of trees (40 ± 9 dead trees·ha −1 ) and a 3.5% reduction in forest carbon stock (6 ± 3 Mg·ha −1 ) in the short-term. The surface area or influence of forest fires of very high density were estimated in the south-central region of Roraima (8374 km 2 ) and the eastern region of the Flona Anauá (37 km 2 ). Illegal selective logging and forest fires in forest areas totaled 357 km 2 in the mosaic area, and 6 km 2 within Flona Anaua. Illegal selective logging and forest fires in the years of severe El Niño droughts threatened the maintenance of environmental services provided by Amazonian forests. selective logging with sustainable forest management or reduced-impact logging (RIL) focuses on the multiple use of timber and non-timber resources that are provided by forests, thereby preserving environmental services [9,11,12]. The long-term viability of the timber trade in the Brazilian Amazon depends on maintaining an adequate volume of legal timber extraction, whilst maintaining healthy forests [13]. Man's greed for the rapid and selective harvesting of high-value tropical timber as a commodity in the global marketplace has accelerated the loss of Amazonian habitats by deforestation and selective logging [2,7,14], with critical consequences for flora and fauna, and contributions to severe climate change.The indiscriminate use of fire by humans in areas of land-use conversion, from native forest to extensive ranching (cattle) and various agricultural uses, has contributed to an increase of burned areas inside and outside of the native forests of Roraima. The fuel of forest fires in Amazonia are residues that are left by illegal selective logging, fragmentation, and burned pastures [15,16]. In the past few decades, mega forest fires have been observed in the Amazon [3,17], specifically in Roraima [18][19][20], with strong interactions between the severity of El Niño droughts, and th...

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