Desmatamento no sul do estado de Roraima: padrões de distribuição em função de projetos de assentamento do INCRA e da distância das principais rodovias (BR-174 e BR-210)

Barni, Paulo Eduardo; Fearnside, Philip M.; Graça, Paulo Maurı́cio Lima de Alencastro

doi:10.1590/s0044-59672012000200003

Cited by 27 publications

(21 citation statements)

References 24 publications

(15 reference statements)

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“…Em trabalho realizado por Barni et al (2012), foram realizadas constatações de perdas de biodiversidade de florestas no sul do estado de Roraima, contribuindo para emissão significativa de gás carbônico à atmosfera, ligadas principalmente a expansão da malha viária amazônica e projetos de assentamento de reforma agrária.…”

Section: Introductionunclassified

Fitossociologia de uma Floresta Ombrófila Densa na Amazônia Setentrional, Roraima, Brasil

Condé

Tonini

2013

Acta Amaz.

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RESUMOO presente estudo teve como objetivo caracterizar a composição florística e fitossociológica de uma floresta nativa no município de Caracaraí, Roraima, Brasil. Foram inventariadas todas as árvores com DAP > 10 cm em 9 parcelas permanentes de 100 x 100 m (1 ha cada Phytosociology of a dense ombrophilous forest in the northern Amazon, Roraima, Brazil ABSTRACTThis study was carried out to characterize species composition and phytosociology of a native forest located at Caracaraí, Roraima, Brazil. All trees with breast diameter (DBH) above 10 cm in nine 1-ha-permanent plots (100 x 100 m each) were inventoried. We observed 4,724 individuals (525 trees per hectare) distributed in 42 families, 111 genera and 165 species. The families with greater number of individuals were Fabaceae (1883), Lecythidaceae (609) and Sapotaceae (434), comprising 52% of the total. The higher densities of individuals were observed in the pioneer (219 trees ha -1 ), followed by secondary (193 trees ha ). However, species of secondary group had the highest species richness (95), followed by the climax (44) and the pioneer (26). The Shannon diversity index (H' = 3.27) and the value of Pielou equability (J = 0.64) were lower than those obtained in other floristic inventories in the Amazon, because of the high occurrence of Pentaclethra macroloba. The importance values (VI) were higher for Pentaclethra macroloba (52.1), Eschweilera bracteosa (23.7) and Pouteria caimito (8.1). The importance values of these three species alone accounted for 28% of the total VI across species. Most of the individuals (71.3% = 374 trees ha -1 ) were recorded in the middle stratum (12.4 m < height < 26.5 m) of forest. The forest community can be considered well-structured, mature and diverse, and so it is in good state of conservation.

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Section: Introductionunclassified

Fitossociologia de uma Floresta Ombrófila Densa na Amazônia Setentrional, Roraima, Brasil

Condé

Tonini

2013

Acta Amaz.

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“…This typically occurs in the Amazon, where approximately 95% of all forest clearings take place at a maximum distance of 50 km from roads, in other words, deforestation is higher near roads (Ferreira et al 2005, Laurance et al 2009, Barni et al 2012. Similarly, the Southern Coastline of São Paulo showed a stronger positive relation between forest cover and distance to roads, where native vegetation cover increased at larger distances from expressways up to 500 m, where a maximum land cover level was reached.…”

Section: Discussionmentioning

confidence: 96%

How Are Native Vegetation and Reserves Affected by Different Road Types in a Southeastern Brazilian State?

Freitas

Sousa²,

Bôscolo³

et al. 2013

Oecol. Austr.

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Reducing connectivity, road networks may threaten the effectiveness of natural reserves, thus, representing a critical conservation matter. This work aims to: 1) evaluate the relationship between native vegetation cover and road distance; 2) evaluate the extent to which native vegetation and nature reserves are affected by roads. Our study area was a neotropical landscape in the state of São Paulo, Brazil. We divided the study area into 15 subregions to represent its high heterogeneity. First, we demarcated buffer zones of 10 different distances around each road, and quantified the density of roads and native vegetation cover. Second, we estimated the area ecologically affected by roads, the roadeffect zone, using buffers of increasing distances according to each road type. The most dense road network was found in the São Paulo Metropolitan area and the lowest was the Southern Coastline subregion, but this subregion showed the second highest expressway density. These two subregions had stronger positive relationships between native vegetation cover and road distance. Almost 10% of São Paulo state, about 6% of the remaining native vegetation, and more than 10% of the reserves were ecologically affected by roads. More than 50% of reserves were ecologically affected, and some have more than 60% of their territory affected. Threats related to proximity of roads, i.e. logging, may reduce effectiveness of more than 50% of natural reserves. Thus, we propose that identifying priority areas for integral conservation of pristine environments should include mostly remote areas, which are far from larger roads and under lower general road influence.

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“…For example, deforestation in private properties in the state of Pará is related to factors such as land grabbing and real estate speculation (Loureiro & Pinto, 2005). On the other hand, settlements located near major highways present a higher deforestation rate (Barni et al, 2012;Rodrigues & Pinheiro, 2011).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Deforestation Dynamics in the Nova Bonal Sustainable Development Project, Acre, Brazil

et al. 2019

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This study assessed the dynamics of the land use and cover changes, deforestation trends and the current status of the Legal Forest Reserves (LFR) and Permanent Protected areas (PPA) in the Nova Bonal Sustainable Development Project (SDP) between 1997-2014. Deforestation datasets and fieldwork were used in this analysis. Our results indicate that there was no trend in the estimated deforestation rate dataset for the SDP, but there was a decreasing trend in deforestation rates within its 10-km buffer zone, most likely due to the scarcity of native forests in that area. The negative environmental area balance of PPA and LFR were observed within the 10-km buffer zone of the SDP. Finally, we conclude that the alternative land and forest uses enforced within the SDP are more effective for environmental conservation than the commonly adopted land uses, especially pastures adopted by conventional colonization located around it.

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Desmatamento no sul do estado de Roraima: padrões de distribuição em função de projetos de assentamento do INCRA e da distância das principais rodovias (BR-174 e BR-210)

Cited by 27 publications

References 24 publications

Fitossociologia de uma Floresta Ombrófila Densa na Amazônia Setentrional, Roraima, Brasil

Fitossociologia de uma Floresta Ombrófila Densa na Amazônia Setentrional, Roraima, Brasil

How Are Native Vegetation and Reserves Affected by Different Road Types in a Southeastern Brazilian State?

Deforestation Dynamics in the Nova Bonal Sustainable Development Project, Acre, Brazil

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