Monitoramento contínuo do potencial redox e de variáveis complementares em ambiente hipersazonal no Pantanal Norte

Messias, Indira Ashant Martins; Couto, Eduardo Guimarães; Amorim, Ricardo Santos Silva; Johnson, Mark Stephen; Pinto, Osvaldo Borges

doi:10.1590/s0100-06832013000300009

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…The short periods of E h < −300 mV at the site in the 2014 flood cycle also created conditions in which CO 2 could be reduced to CH 4 [ Vepraskas and Faulkner , ]. Measurements made in 2010 and 2011 at the Carrapatal site (Figure ) showed E h < −200 mV [ Messias et al ., ] resulting from soil saturation during flooding. The Carrapatal site exhibited E h < 0 for 23 days in 2013, and for 63 days in 2014, with differences linked to longer inundation periods for 2014 compared to 2013 [ Dalmagro et al ., ].…”

Section: Resultsmentioning

confidence: 99%

“…[] used a multiparameter and autonomous measurement station in the Northern Pantanal, reporting annual CO 2 efflux from the wetland soil of 1220 g C m −2 y −1 . These measurements were accompanied by high‐frequency soil E h observations, which revealed important information on soil conditions under prolonged inundation, which include possible CH 4 emissions [ Dalmagro et al ., ; Messias et al ., ]. Similar measurements are required in other Pantanal landscapes to understand the mechanisms of soil CO 2 dynamics in tropical wetlands and their dependency on local hydrology and vegetation.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we provide half‐hourly measurements of soil CO 2 concentrations and estimate fluxes at a tree island in the Brazilian Pantanal during the 2014 and 2015 flood cycles using a multiparameter and autonomous measurement station similar to installations described in previous research [ Johnson et al ., ; Messias et al ., ] with the objectives to (1) capture intraannual and interannual changes in soil CO 2 dynamics as influenced by precipitation and soil wetting events and (2) link the C and water cycles in the Pantanal by comparing findings at the tree island to those of a nearby site [ Dalmagro et al ., ; Johnson et al ., ] with distinct vegetation and flood events.…”

Section: Introductionmentioning

confidence: 99%

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Soil CO₂concentrations and efflux dynamics of a tree island in the Pantanal wetland

et al. 2017

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The Pantanal is the largest tropical wetland on the planet, and yet little information is available on the biome's carbon cycle. We used an automatic station to measure soil CO2 concentrations and oxidation‐reduction potential over the 2014 and 2015 flood cycles of a tree island in the Pantanal that is immune to inundation during the wetland's annual flooding. The soil CO2 concentration profile was then used to estimate soil CO2 efflux over the two periods. In 2014, subsurface soil saturation at 0.30 m depth created conditions in that layer that led to CO2 buildup close to 200,000 ppm and soil oxidation‐reduction potential below −300 mV, conditions that were not repeated in 2015 due to annual variability in soil saturation at the site. Mean CO2 efflux over the 2015 flood cycle was 0.023 ± 0.103 mg CO2‐C m−2 s−1 representing a total annual efflux of 593 ± 2690 mg CO2‐C m−2 y−1. Unlike a nearby tree island site that experiences full inundation during the wet season, here the soil dried quickly following repeated rain events throughout the year, which led to the release of CO2 pulses from the soil. This study highlights not only the complexity and heterogeneity in the Pantanal's carbon balance based on differences in topography, flood cycles, and vegetation but also the challenges of applying the gradient method in the Pantanal due to deviations from steady state conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil CO₂concentrations and efflux dynamics of a tree island in the Pantanal wetland

et al. 2017

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“…These landscape features present unique biogeochemical characteristics, especially with respect to soil oxidation‐reduction (Messias et al. ) and soil respiration (Johnson et al. ).…”

Section: Methodsmentioning

confidence: 99%

“…; Messias et al. ; Dalmagro et al. ), we combine soil parameter measurements with leaf measurements to further understand species' adaptability to flooding.…”

Section: Introductionmentioning

confidence: 99%

Physiological responses to extreme hydrological events in the Pantanal wetland: heterogeneity of a plant community containing super‐dominant species

Dalmagro

Lathuillière

Vourlitis

et al. 2016

J Vegetation Science

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Aims We tested two mechanisms of adaptation to extreme hydrological stresses (flooding and drought) of species making up a tropical wetland plant community by measuring leaf gas exchange and water potential. We hypothesized that anoxic conditions that occur during flooding will decrease leaf gas exchange when compared to the dry season, and that ‘super‐dominant’ species will have a distinctive physiological advantage when compared to other plants within the community. Location Northern Pantanal wetland, Private Natural Heritage Reserve of the Brazilian Social Service of Commerce (RPPN‐SESC Pantanal), Mato Grosso, Brazil. Methods Two periods representing typical extreme hydrological conditions in the Pantanal wetland were selected based on historical soil and meteorological measurements: (1) a drought period when plants experience stress due to soil moisture deficits during a dry season that persists for several months (May to Sept), and (2) a flooding period when oxidation‐reduction potential is negative for 30 d or more (Mar or Apr), indicating anoxic stress. Measurements of gas exchange and leaf water potential were made on seven species in drought and flood stress conditions. The seven species represent the majority of the plant community. Results As a whole, the plant community showed significantly lower potential net photosynthesis (PN) during flooding when soil oxidation‐reduction potential reached close to −900 mV when compared to the dry season, but the magnitude of the decline in PN was species specific. Not all super‐dominant species showed higher PN compared to non‐dominant species, but they did demonstrate higher stomatal conductance and transpiration leading to lower water use efficiency. The combination of higher PN despite low soil water content suggests that the plant community had access to deep water resources. This access was also confirmed by the midday leaf water potential, which was similar for the flood and dry seasons. Conclusions Results suggest that the plant community may have high physiological performance under a wide range of soil oxidation‐reduction potentials. Higher PN rates of super‐dominant species indicate a physiological advantage of these species in the different hydrological conditions.

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Soils of Pantanal: The Largest Continental Wetland

Couto

Corrêa

Oliveira

et al. 2023

World Soils Book Series

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Monitoramento contínuo do potencial redox e de variáveis complementares em ambiente hipersazonal no Pantanal Norte

Cited by 9 publications

References 21 publications

Soil CO₂concentrations and efflux dynamics of a tree island in the Pantanal wetland

Soil CO₂concentrations and efflux dynamics of a tree island in the Pantanal wetland

Physiological responses to extreme hydrological events in the Pantanal wetland: heterogeneity of a plant community containing super‐dominant species

Soils of Pantanal: The Largest Continental Wetland

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Monitoramento contínuo do potencial redox e de variáveis complementares em ambiente hipersazonal no Pantanal Norte

Cited by 9 publications

References 21 publications

Soil CO2concentrations and efflux dynamics of a tree island in the Pantanal wetland

Soil CO2concentrations and efflux dynamics of a tree island in the Pantanal wetland

Physiological responses to extreme hydrological events in the Pantanal wetland: heterogeneity of a plant community containing super‐dominant species

Soils of Pantanal: The Largest Continental Wetland

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Product

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Soil CO₂concentrations and efflux dynamics of a tree island in the Pantanal wetland

Soil CO₂concentrations and efflux dynamics of a tree island in the Pantanal wetland