Post-fire dynamics of woody vegetation in seasonally flooded forests (impucas) in the Cerrado-Amazonian Forest transition zone

Maracahipes, Leandro; Marimon, Beatriz Schwantes; Lenza, Eddie; Marimon‐Junior, Ben Hur; Oliveira, Edmar Almeida de; Mews, Henrique Augusto; Gomes, Letícia; Feldpausch, Ted R.

doi:10.1016/j.flora.2014.02.008

Cited by 20 publications

(30 citation statements)

References 67 publications

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“…Stand basal area range from 15.3 m 2 per hectare in F5 to 33.5 m 2 per hectare in F1. All these changes in the vegetation have been attributed to longer dry seasons and higher frequency of fire events by da Silva et al (), Maracahipes et al (), and Nogueira et al () but not to a particular fire event detected between 2007 (first survey year) and 2013 (last year of the fire frequency record).…”

Section: Methodsmentioning

confidence: 90%

“…The frequent fires in southern Amazonia have led to aboveground biomass loss in the studied forests (da Silva et al, ; Maracahipes et al, ; Nogueira et al, ) with, as of yet, unquantified consequences for microbially mediated soil processes. Fire‐induced aboveground biomass loss may influence ANF through, among other factors, reduced C inputs from photosynthesis into the soil (Perakis et al, ) and changes in litterfall mass, decomposition, and resulting shifts in forest N and P cycling (Butler et al, ; Mataix‐Solera et al, ; Nardoto et al, ; Reed et al, ; Sayer & Tanner, ).…”

Section: Discussionmentioning

confidence: 99%

“…Those forests are sensitive to fire because trees adapted to humid tropical forests are generally not fire‐adapted (Franco et al, ); thus, high tree mortality can occur as a result of fire (Hoffmann et al, ). Ongoing long‐term (>12 years) ecological research has indicated above‐average tree mortality and diversity loss in seasonally flooded forests due to fire (da Silva et al, ; Maracahipes et al, ). Fire disturbance can disrupt biological processes and biogeochemical cycles, notably those concerning N (Pellegrini et al, ), which can influence natural succession in dystrophic, nutrient‐poor soils (de Oliveira et al, ; Nardoto et al, ; Taylor et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

et al. 2020

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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.

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Section: Methodsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

et al. 2020

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“…) and lasts for 4–5 months, after which it is subject to strong desiccation during the dry season, when burns are common (Eiten , Maracahipes et al . ). Here, we examine the effects of seasonal flooding on lizard community structure by comparing communities in two adjacent habitats, a seasonally flooded and a non‐flooded forest, within a riparian zone.…”

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confidence: 97%

Juxtaposition and Disturbance: Disentangling the Determinants of Lizard Community Structure

et al. 2015

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Disturbance alters the structure and dynamics of communities. Here, we examined the effects of seasonal flooding on the lizard community structure by comparing two adjacent habitats, a seasonally flooded and a non-flooded forest, in a Cerrado-Amazon ecotone area, the Cantão State Park, Tocantins state, Brazil. Despite the strong potential impact of seasonal flooding, the only significant environmental difference detected was more termite mounds in non-flooded forests. Species richness was significantly higher in the non-flooded forest. Colobosaura modesta, followed by Mabuya frenata and Anolis brasiliensis, were the only species that differed in number of captures between sites. Colobosaura modesta was exclusively found in the non-flooded forest, while Anolis brasiliensis was the most captured in the flooded forest. Mabuya frenata is indicated as an indicator species in the flooded forest, and Colobosaura modesta in the non-flooded forest. We found a significant association between lizard abundances and habitat characteristics, with flooding, canopy cover, and logs being the best predictors. A phylogenetic community structure analysis indicated a lack of structure in both lizard assemblages. Overall, we show that seasonal flooding can strongly impact species richness and species occurrence patterns, but not phylogenetic community structure. The Amazon-Cerrado transition is undergoing pronounced transformations due to deforestation and climate change. Despite being species-poor compared with central areas in Amazon or Cerrado, this ecotone harbors species with important adaptations that could hold the key to persistence in human-disturbed landscapes or during periods of climate change.Abstract in Portuguese is available with online material.

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“…In dry years, tropical floodplain forests can burn severely (Page et al 2002;Maracahipes et al 2014;. In the Amazon, satellite images of the Negro river indicate that burnt floodplain forests recover at a much lower rate when compared to burnt upland forests .…”

Section: Introductionmentioning

confidence: 99%

Resilience of Amazonian forests : the roles of fire, flooding and climate

Flores¹

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Post-fire dynamics of woody vegetation in seasonally flooded forests (impucas) in the Cerrado-Amazonian Forest transition zone

Cited by 20 publications

References 67 publications

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

Juxtaposition and Disturbance: Disentangling the Determinants of Lizard Community Structure

Resilience of Amazonian forests : the roles of fire, flooding and climate

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