Dinâmica De Fogo No Parque Estadual Do Araguaia, Zona De Transição Amazônia-Cerrado

Neves, Laís Fernandes de Souza; Marimon, Beatriz Schwantes; Anderson, Liana O.; Neves, Sandra Mara Alves da Silva

doi:10.5380/raega.v44i0.47926

Cited by 9 publications

(19 citation statements)

References 5 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Schematic map showing the location of Araguaia State Park, Mato Grosso State, Brazil, and our sampling design based on (a) the spatial interpolation of fire frequency (i.e., the number of wildfire events between 2000 and 2013) increasing from light‐yellow to red. F1, F2, F2b, F4, and F5 are the sampled stands, where the labels match the number of fire events over the 13 years (e.g., F1 burned once, F2 and F2b twice, F4 four times, and F5 five times between 2000 and 2013; Neves et al, ). The gray squares in (b) represent the burned subplots (20 m × 10 m) within the permanent 1 ha plot, and the white squares represent the unburned subplots.…”

Section: Methodsmentioning

confidence: 99%

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

et al. 2020

View full text Add to dashboard Cite

In this study, we investigate the biogeochemical consequences of fire in seasonally flooded Amazon forests, where recent declines in forest cover have been linked to increases in fire frequency and severity. Previous studies have hypothesized that a quasi‐permanent state‐shift transition from typical Amazon forests to open savannas can occur when fire results in further depletion of already impoverished soil nutrient pools. Asymbiotic N2 fixation (ANF) is an essential pathway for fire‐affected forests to acquire nitrogen (N) after disturbance, but ANF response to fire has yet to be quantified in Amazonia. Here, we quantify ANF through field sampling and laboratory incubations using 15N‐labeled dinitrogen (15N2) and measurement of 14 biogeochemical parameters in surface (0–10 cm) and subsurface (10–30 cm) soils. Our data represent burned and unburned replicated sampling sites, across five stands, spanning a gradient from infrequent (once in 13 years) to frequent (five times in 13 years) fire occurrences. ANF did not vary with fire frequency but was, on average, 24% lower in burned than in unburned surface soils across all stands. Burned and unburned subsurface soils had similar ANF rates. About 58% of ANF variance was explained by the joint effect of carbon (C):N ratio and available phosphorus (P) in burned and unburned soils. ANF increased linearly with C:N and P availability in unburned soils, but a highly non‐linear relationship was observed in burned soils. Our findings show that fire alters soil C‐to‐nutrient stoichiometry, which resulted in lower N inputs via ANF into burned relative to unburned tropical forest soils.

show abstract

Section: Methodsmentioning

confidence: 99%

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Há registros recorrentes anuais de grandes incêndios nas unidades de conservação no Brasil (Alvarado et al, 2018). O Parque Estadual do Araguaia (PEA) é uma Unidade de Proteção Integral localizada no Leste do Estado do Mato Grosso e os incêndios nessa região ao longo dos anos são frequentes (Neves et al, 2018). Neste contexto, merecem destaque os eventos ocorridos em 2015 onde foram detectados aglomerados de focos de calor no PEA (INPE, 2015).…”

Section: Introductionunclassified

“…Ao comparar as imagens pré e pós-queimada das variáveis NDVI, NBR e temperatura de superfície espera-se identificar diferença significativa entre as imagens e obter a correlação entre as variáveis. (Neves et al, 2018).…”

Section: Introductionunclassified

Índices Espectrais e Temperatura de Superfície em Áreas Queimadas no Parque Estadual do Araguaia em Mato Grosso

Lotufo

Machado

Taques

et al. 2020

Rev. Bras. Geog. Fis.

View full text Add to dashboard Cite

As queimadas impactam negativamente a biodiversidade dos ecossistemas naturais, alterando os atributos físicos e biológicos e influenciando os fluxos de energia e biogeoquímicos. Sendo assim, o objetivo deste trabalho foi analisar através do sensoriamento remoto o efeito de áreas queimadas sobre os índices espectrais NDVI (Índice de Vegetação por Diferença Normalizada) e NBR (Índice de Queimada Normalizada) e na temperatura de superfície no Parque Estadual do Araguaia (PEA) em Mato Grosso, Brasil. Imagens do satélite de Landsat 8 OLI foram utilizadas para analisar a superfície no período pré-queimada (15/06/2015) e pós-queimada (21/10/2015) no Parque Estadual. Os resultados demonstraram que o NDVI apresentou maiores valores nas áreas com vegetação densa e menores valores em solo exposto, associados à vegetação seca, carbonização ou com completa ausência de vegetação. O NBR apresentou valores negativos nas áreas queimadas, devido ao aumento da refletância após passagem do fogo devido à deposição de cinzas brancas. A temperatura da superfície foi maior no pós-queimada relacionada a uma maior capacidade de absorção da superfície (cor preta das cinzas). Estes resultados são atribuídos aos efeitos combinados de maior exposição do solo, aumento da absorção da radiação pela vegetação carbonizada e redução da evapotranspiração relativa à vegetação verde existente no período pré-queimada. Spectral Indexes and Surface Temperature on Burnt Areas at Araguaia State Park in Mato Grosso A B S T R A C TFires harm the biodiversity of natural ecosystems, changing physical and biological attributes and influencing energy and biogeochemical flows. Therefore, the objective of this work was to analyze through remote sensing the effect of burnt areas on the NDVI (Normalized Difference Vegetation Index) and NBR (Normalized Burn Index) spectral indexes and on the surface temperature in Araguaia State Park (PEA) in Mato Grosso, Brazil. Satellite images of Landsat 8 OLI were used to analyze the surface in the pre-burned (06/15/2015) and post-burned (10/21/2015) period in the State Park. The results showed that NDVI showed higher values in areas with dense vegetation and lower values in exposed soil, associated with dry vegetation, carbonization or with a complete absence of vegetation. The NBR showed negative values in the burnt areas, due to the increase in reflectance after the passage of the fire due to the deposition of white ash. The surface temperature was higher in the post-firing period due to a greater absorption capacity of the surface (black color of the ashes). These results are attributed to the combined effects of greater soil exposure, increased absorption of radiation by carbonized vegetation and reduced evapotranspiration relative to green vegetation in the pre-burned period.Keywords: Fire; Protected Area; Remote Sensing.

show abstract

“…The total area of forests and non-forests (Brazilian Cerrado and productive lands) affected by fires corresponds to 13,773 km 2 and 83,082 km 2 respectively (Table 2). A detailed analysis about the burned area and its associated carbon emissions during the 2010 drought for Mato Grosso is presented by Anderson et al [52].…”

Section: Burned Areamentioning

confidence: 99%

“…Three main regions have been identified with a particular necessity of supporting daily images: (i) in the eastern boundary of the state, where there is a seasonally flooded area (known as the Bananal floodplain) [51] and wildfires are common [52], (ii) in the Xingu Indigenous reserve, the largest continuous forest fragment in the state, where burned areas occur close to the seasonal rivers due to the location of the traditional communities and (iii) some areas in southern and western areas of the state, where dark soil patches are observed. These images were used for checking burned areas and for guiding the manual edition of the burn scars.…”

Section: Burned Area Mappingmentioning

confidence: 99%

Development of a Point-based Method for Map Validation and Confidence Interval Estimation: A Case Study of Burned Areas in Amazonia

Anderson¹,

Cheek²,

Aragão³

et al. 2017

J Remote Sensing & GIS

Self Cite

View full text Add to dashboard Cite

Forest fires and their associated emissions are a key component for the efficient implementation of the Reducing Emissions from Deforestation and Forest Degradation (REDD+) policy. The most suitable method for quantifying large scale fire-associated impacts is by mapping burned areas using remote sensing data. However, to provide robust quantification of the impacts of fire and support coherent policy decisions, these thematic maps must have their accuracy quantitatively assessed. The aim of this research is to present a point-based validation method developed for quantifying the accuracy of burned area thematic maps and test this method in a study case in the Amazon. The method is general; it can be applied to any thematic map consisting of two land cover classes. A stratified random sampling scheme is used to ensure that each class is represented adequately. The confidence intervals for the user's accuracies and for both overall accuracy and area error are calculated using the Wilson Score method and Jeffrey Perks interval, respectively. Such interval methods are novel in the context of map accuracy assessment. Despite the complexity of calculation of the confidence intervals, their use is recommended. A spreadsheet to calculate point and interval estimates is provided for users.

show abstract

Dinâmica De Fogo No Parque Estadual Do Araguaia, Zona De Transição Amazônia-Cerrado

Cited by 9 publications

References 5 publications

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

Índices Espectrais e Temperatura de Superfície em Áreas Queimadas no Parque Estadual do Araguaia em Mato Grosso

Development of a Point-based Method for Map Validation and Confidence Interval Estimation: A Case Study of Burned Areas in Amazonia

Contact Info

Product

Resources

About