Post-fire recovery of a dense ombrophylous forest in Amazon

Andrade, Dárlison Fernandes Carvalho de; Gama, João Ricardo Vasconcellos; Ruschel, Ademir Roberto; Melo, Lia Oliveira; Avila, Angela Luciana de; Carvalho, J. O. P. de

doi:10.1590/0001-3765201920170840

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…Basal area of small, medium, and large trees significantly declined (by more than 50%) with fire frequency increase; but the frequent fires had little effect on seedlings and saplings. Reductions in basal area were also observed for stems < 30 cm D of stands burned once in central Amazonia (increase of 63.2% in loss of basal area compared to non-burned: Andrade et al, 2019) and on trees > 50 cm D of three times burned sites in northern Amazonia (reduction of about 54% basal area: Martins et al, 2012). In seasonally dry tropical forest in India, woody plants were apparently unaffected by fire frequency, which may be related to dominance by larger individuals (Dattaraja et al, 2018).…”

Section: Changes In Structural Complexity Due To Firementioning

confidence: 78%

Fire Effects on Understory Forest Regeneration in Southern Amazonia

Prestes

Massi

Alves-Silva

et al. 2020

Front. For. Glob. Change

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Fire in tropical forests increases tree mortality, degrades forest structure, and reduces carbon stocks. Currently, there are large gaps in understanding how fire affects understory forest structure and composition, interactions with fire recurrence, and longterm impacts. Understanding these changes is critical to evaluate the present and future response of tropical forests to fire. We studied post-fire changes in understory regeneration in forests in Mato Grosso State, southern Amazonia, Brazil, aiming to answer the following questions: (i) does forest structure (basal area) and tree community composition vary with fire frequency and time since the last fire? (ii) does the response differ among strata (e.g., sapling, larger trees)? (iii) are changes in diversity associated with changes in forest structure? We surveyed trees and lianas in previously structurally intact forests that underwent selective logging, followed by different fire histories, including 5 and 16 years after once-burned, 5 years after three times burned, and unburned (control). Overall, species composition (abundance, richness, and number of families) and diversity were highest for the unburned treatment and lowest for the recurrent burned areas. Fire frequency negatively affected plant structure and basal area; basal area of small, medium, and large plants declined significantly by more than 50% in the most frequently burned areas. Richness was positively related to basal area in the three times burned sites and in the 16 years regenerating site for all strata. Our results demonstrate the negative influence of frequent fires on both the composition and structure of small trees in Amazonian forest. These changes to the cohort of small-sized trees may persist and have long-term impacts on forest structure, affecting the capacity, and direction of forest recovery. With wildfire widespread across the region and increasing in frequency, fire may negatively affect tree diversity in remaining selectively logged forests, and affect regional carbon cycling with consequences for the global vegetation carbon sink.

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Section: Changes In Structural Complexity Due To Firementioning

confidence: 78%

Fire Effects on Understory Forest Regeneration in Southern Amazonia

Prestes

Massi

Alves-Silva

et al. 2020

Front. For. Glob. Change

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“…O fogo atingiu a vegetação arbórea com muita rapidez e uma equipe de funcionários da unidade regional da Embrapa ficou no local durante dois dias até que o fogo fosse apagado, reduzindo-se os danos. Informações detalhadas sobre o aumento da mortalidade e recrutamento de árvores em decorrência deste incêndio podem ser obtidas em Andrade et al (2019).…”

Section: Identificação Das Parcelas Atingidas Pelo Fogounclassified

Composição e estrutura de uma floresta primária atingida por incêndio florestal na Amazônia Oriental

et al. 2020

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A dinâmica da composição florística de uma área de floresta primária, atingida por fogo, em 1997, na Amazônia brasileira, foi analisada, comparando-se dados de inventários amostrais, realizados nos anos de 1983, 1987, 1989, 1995, 2008 e 2012, em 12 parcelas permanentes de 0,25 hectares, com dados anteriores (14 anos) e posteriores ao incêndio (15 anos). A área de estudo está localizada em uma floresta ombrófila densa, sem histórico de distúrbios antrópicos, na Floresta Nacional do Tapajós, oeste do estado do Pará. As questões deste estudo são as seguintes: (1) Qual o efeito de um primeiro incêndio na composição de espécies arbóreas de uma floresta primária na Amazônia? (2) Existe diferença, na diversidade de espécies arbóreas, antes e após o fogo? Para responder essas questões, (i) foram descritas, quantificadas e comparadas a composição de espécies arbóreas de antes e depois o fogo, (ii) foram quantificadas e comparadas a riqueza e a diversidade de espécies arbóreas de antes e após o fogo. Após 15 anos da ocorrência do incêndio, a floresta não registrou perdas em riqueza e diversidade de espécies arbóreas, indicando boa resiliência ao distúrbio. As alterações pós-fogo na composição florística de uma floresta primária são definidas, principalmente, pela entrada e saída de espécies localmente raras, e as espécies com maior densidade e área basal são responsáveis pela manutenção da estrutura da floresta, destacando-se dentre elas: Rinorea guianensis Aubl. e Protium apiculatum Swart.

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“…The area is also surrounded by different types of land use. It also faces multi-factor anthropic pressures, illegal logging impacts [23], and historically, the area has suffered from alarming fire spread events [24]. In 2012, TNF lost 17,851 ha of its previous area, due to the Federal Law no.…”

Section: Introductionmentioning

confidence: 99%

Discriminating Forest Successional Stages, Forest Degradation, and Land Use in Central Amazon Using ALOS/PALSAR-2 Full-Polarimetric Data

et al. 2020

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We discriminated different successional forest stages, forest degradation, and land use classes in the Tapajós National Forest (TNF), located in the Central Brazilian Amazon. We used full polarimetric images from ALOS/PALSAR-2 that have not yet been tested for land use and land cover (LULC) classification, neither for forest degradation classification in the TNF. Our specific objectives were: (1) to test the potential of ALOS/PALSAR-2 full polarimetric images to discriminate LULC classes and forest degradation; (2) to determine the optimum subset of attributes to be used in LULC classification and forest degradation studies; and (3) to evaluate the performance of Random Forest (RF) and Support Vector Machine (SVM) supervised classifications to discriminate LULC classes and forest degradation. PALSAR-2 images from 2015 and 2016 were processed to generate Radar Vegetation Index, Canopy Structure Index, Volume Scattering Index, Biomass Index, and Cloude–Pottier, van Zyl, Freeman–Durden, and Yamaguchi polarimetric decompositions. To determine the optimum subset, we used principal component analysis in order to select the best attributes to discriminate the LULC classes and forest degradation, which were classified by RF. Based on the variable importance score, we selected the four first attributes for 2015, alpha, anisotropy, volumetric scattering, and double-bounce, and for 2016, entropy, anisotropy, surface scattering, and biomass index, subsequently classified by SVM. Individual backscattering indexes and polarimetric decompositions were also considered in both RF and SVM classifiers. Yamaguchi decomposition performed by RF presented the best results, with an overall accuracy (OA) of 76.9% and 83.3%, and Kappa index of 0.70 and 0.80 for 2015 and 2016, respectively. The optimum subset classified by RF showed an OA of 75.4% and 79.9%, and Kappa index of 0.68 and 0.76 for 2015 and 2016, respectively. RF exhibited superior performance in relation to SVM in both years. Polarimetric attributes exhibited an adequate capability to discriminate forest degradation and classes of different ecological succession from the ones with less vegetation cover.

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Post-fire recovery of a dense ombrophylous forest in Amazon

Cited by 9 publications

References 25 publications

Fire Effects on Understory Forest Regeneration in Southern Amazonia

Fire Effects on Understory Forest Regeneration in Southern Amazonia

Composição e estrutura de uma floresta primária atingida por incêndio florestal na Amazônia Oriental

Discriminating Forest Successional Stages, Forest Degradation, and Land Use in Central Amazon Using ALOS/PALSAR-2 Full-Polarimetric Data

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