The changing rates and patterns of deforestation and land use in Brazilian Amazonia

Asner, Gregory P.; Keller, Michael; Lentini, Marco; Merry, Frank; Souza, Carlos M.

doi:10.1029/2008gm000722

Cited by 41 publications

(58 citation statements)

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“…During 2000-2005, the Amazon arc of deforestation was the most active tropical land use frontier [1]. Large, export-oriented enterprises played an unprecedented role in the rise and fall of Amazon deforestation between 2000 and 2009 [2][3][4][5]. Climate-driven fire risk in Amazonia during the past decade also responded to large-scale climate modes, such as the El Niñ o Southern Oscillation (ENSO) and Atlantic Multi-decadal Oscillation (AMO).…”

Section: Introductionmentioning

confidence: 99%

Understorey fire frequency and the fate of burned forests in southern Amazonia

Morton

Page

DeFries

et al. 2013

Phil. Trans. R. Soc. B

194

220

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Recent drought events underscore the vulnerability of Amazon forests to understorey fires. The long-term impact of fires on biodiversity and forest carbon stocks depends on the frequency of fire damages and deforestation rates of burned forests. Here, we characterized the spatial and temporal dynamics of understorey fires (1999–2010) and deforestation (2001–2010) in southern Amazonia using new satellite-based estimates of annual fire activity (greater than 50 ha) and deforestation (greater than 10 ha). Understorey forest fires burned more than 85 500 km 2 between 1999 and 2010 (2.8% of all forests). Forests that burned more than once accounted for 16 per cent of all understorey fires. Repeated fire activity was concentrated in Mato Grosso and eastern Pará, whereas single fires were widespread across the arc of deforestation. Routine fire activity in Mato Grosso coincided with annual periods of low night-time relative humidity, suggesting a strong climate control on both single and repeated fires. Understorey fires occurred in regions with active deforestation, yet the interannual variability of fire and deforestation were uncorrelated, and only 2.6 per cent of forests that burned between 1999 and 2008 were deforested for agricultural use by 2010. Evidence from the past decade suggests that future projections of frontier landscapes in Amazonia should separately consider economic drivers to project future deforestation and climate to project fire risk.

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Section: Introductionmentioning

confidence: 99%

Understorey fire frequency and the fate of burned forests in southern Amazonia

Morton

Page

DeFries

et al. 2013

Phil. Trans. R. Soc. B

194

220

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“…However, the same patterns are not found for all transitions from single land-cover types. This is not surprising considering typical land-cover sequences (often called land-use trajectories) that follow total deforestation and are discussed in the literature (Ramankutty et al, 2007;Alves et al, 2009;de Espindola et al, 2012). According to these studies, a com- mon trajectory is that cleared forest patches are converted to pasture land or used for small-scale subsistence agriculture.…”

Section: Spatial Heterogeneity Of Land-cover Transitions and Discussimentioning

confidence: 99%

A matrix clustering method to explore patterns of land-cover transitions in satellite-derived maps of the Brazilian Amazon

Müller-Hansen

Cardoso

Dalla-Nora

et al. 2017

Nonlin. Processes Geophys.

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Abstract. Changes in land-use systems in tropical regions, including deforestation, are a key challenge for global sustainability because of their huge impacts on green-house gas emissions, local climate and biodiversity. However, the dynamics of land-use and land-cover change in regions of frontier expansion such as the Brazilian Amazon are not yet well understood because of the complex interplay of ecological and socioeconomic drivers. In this paper, we combine Markov chain analysis and complex network methods to identify regimes of land-cover dynamics from land-cover maps (TerraClass) derived from high-resolution (30 m) satellite imagery. We estimate regional transition probabilities between different land-cover types and use clustering analysis and community detection algorithms on similarity networks to explore patterns of dominant land-cover transitions. We find that land-cover transition probabilities in the Brazilian Amazon are heterogeneous in space, and adjacent subregions tend to be assigned to the same clusters. When focusing on transitions from single land-cover types, we uncover patterns that reflect major regional differences in land-cover dynamics. Our method is able to summarize regional patterns and thus complements studies performed at the local scale.

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“…A Amazônia brasileira vem, há décadas, sofrendo com a intensa degradação de sua vegetação natural devido, principalmente, à criação de rodovias, desenvolvimento de polos no processo de ocupação (Machado, 1998;Alves et al, 1999Alves et al, , 2009Alves, 2002) e à intensificação do uso da terra e expansão de novas áreas desmatadas, associadas ao abandono após o esgotamento dos recursos delas.…”

Section: Introductionunclassified

Avaliação da Dinâmica da Vegetação em Áreas Desmatadas na Floresta Amazônica

et al. 2015

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RESUMONo presente estudo avaliou-se a dinâmica da vegetação de florestas tropicais no período de 2000 a 2010 em áreas desmatadas, utilizando-se os produtos MOD44B, 3B43 e SRTM. Através deles analisou-se, temporal e espacialmente, a ocorrência de regeneração em áreas de desmatamento mapeadas pelo sistema PRODES (Projeto de Estimativa de Desflorestamento da Amazônia) do INPE (Instituto Nacional de Pesquisas Espaciais). Os resultados encontrados mostraram que há regeneração nas áreas desmatadas e que, ao longo do tempo, a densidade da vegetação tende a aumentar. As áreas regeneradas apareceram majoritariamente em áreas mais baixas, seguindo a tendência do desmatamento. O MOD44B mostrou-se eficiente no estudo temporal e espacial da vegetação, indicando haver regeneração ao longo do tempo. O período de maior precipitação coincidiu com o período em que os pixels de menor densidade migraram para classes de maior densidade, sugerindo uma possível relação entre os índices de precipitação e o crescimento da vegetação.Palavras-chave: crescimento da vegetação, análise estatística, sensoriamento remoto, MODIS. Vegetation Dynamics Evaluation in the Amazon Rainforest Deforested Areas ABSTRACTThis article uses data from orbital platforms (MOD44B, 3B43 and SRTM) to evaluate the vegetation dynamics of tropical forests in deforested areas between 2000 and 2010. We analyzed, temporally and spatially, the occurrence of vegetation regeneration in deforested areas mapped by the PRODES system (Programa de Cálculo do Desflorestamento da Amazônia) of the INPE (Instituto Nacional de Pesquisas Espaciais). The results revealed regeneration in deforested areas and also showed that vegetation density tends to increase over time. Areas of regeneration are mainly found in low land areas following the path of deforestation. MOD44B was effective in the vegetation temporal and spatial study, and indicated occurrence of regeneration over time. The higher precipitation period overlapped with the period in which lower density pixels migrated to classes of higher density, which suggests a possible relationship between precipitation indexes and vegetation growth.

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The changing rates and patterns of deforestation and land use in Brazilian Amazonia

Cited by 41 publications

References 50 publications

Understorey fire frequency and the fate of burned forests in southern Amazonia

Understorey fire frequency and the fate of burned forests in southern Amazonia

A matrix clustering method to explore patterns of land-cover transitions in satellite-derived maps of the Brazilian Amazon

Avaliação da Dinâmica da Vegetação em Áreas Desmatadas na Floresta Amazônica

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