Carbon biogeochemistry of a flooded Pantanal forest over three annual flood cycles

Dalmagro, Higo J.; Lathuillière, Michael J.; Hawthorne, I.; Morais, Douglas Dias de; Pinto, Osvaldo Borges; Couto, Eduardo Guimarães; Johnson, Mark S.

doi:10.1007/s10533-018-0450-1

Cited by 16 publications

(17 citation statements)

References 93 publications

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“…An inverse relation between CO 2 concentrations and DO was observed in this study as in many freshwater ecosystems, including tropical floodplains along sub‐Saharan African rivers (Borges et al, ), the Pantanal (Hamilton et al, ), and temperate swamp forests (Happell & Chanton, ). In the Pantanal wetlands, the highest CO 2 concentrations and fluxes occurred as flooding began because of decomposition of freshly inundated soil and plant organic matter (Dalmagro et al, ; Hamilton et al, ). The inverse relation between CO 2 concentrations and DO suggests that aerobic processes are important for CO 2 production.…”

Section: Discussionmentioning

confidence: 99%

“…Mean daily fluxes measured in our study (2,182 + 2,954 SD mg C·m −2 d −1 ) are higher than or similar to the few other measurements in waters within tropical and subtropical flooded forests ( Table 2). The low CO 2 efflux reported by Dalmagro et al (2018) is likely related to their use of a wind-based equation to estimate the CO 2 fluxes. While wind speeds in flooded forest sites are low, other processes can increase fluxes, as noted above and in MacIntyre et al (2019).…”

Section: Implications For the Regional C Budget And Other Forested Wementioning

confidence: 98%

“…Mean value from eleven daily measurements made in flooded forests. e Dalmagro et al (2018). Mean value obtained using 40 measurements of surface CO 2 water concentrations and a wind-based equation during the flooded season (March to June).…”

Section: Inverse Relation Between Co 2 Concentrations and Domentioning

confidence: 99%

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Carbon Dioxide Fluxes to the Atmosphere From Waters Within Flooded Forests in the Amazon Basin

et al. 2020

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Inundated tropical forests are underrepresented in analyses of the global carbon cycle and constitute 80% of the surface area of aquatic environments in the lowland Amazon basin. Diel variations in CO2 concentrations and exchanges with the atmosphere were investigated from August 2014 to September 2016 in two flooded forests sites with different wind exposure within the central Amazon floodplain (3°23′S, 60°18′W). CO2 profiles and estimates of air–water gas exchange were combined with ancillary environmental measurements. Surface CO2 concentrations ranged from 19 to 329 μM, CO2 fluxes ranged from −0.8 to 55 mmol m−2 hr−1 and gas transfer velocities ranged from 0.2 to 17 cm hr−1. CO2 concentrations and fluxes were highest during the high water period. CO2 fluxes were three times higher at a site with more wind exposure (WE) compared to one with less exposure (WP). Emissions were higher at the WP site during the day, whereas they were higher at night at the WE site due to vertical mixing. CO2 concentrations and fluxes were lower at the W P site following an extended period of exceptionally low water. The CO2 flux from the water in the flooded forest was about half of the net primary production of the forest estimated from the literature. Mean daily fluxes measured in our study (182 ± 247 mmol m−2d−1) are higher than or similar to the few other measurements in waters within tropical and subtropical flooded forests and highlight the importance of flooded forests in carbon budgets.

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Section: Discussionmentioning

confidence: 99%

Section: Implications For the Regional C Budget And Other Forested Wementioning

confidence: 98%

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Carbon Dioxide Fluxes to the Atmosphere From Waters Within Flooded Forests in the Amazon Basin

et al. 2020

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“…At each sampling points (distant 50 m from one point to the other), we obtained a sample 0.10 m below the surface from visually well mixed sites in the main thalweg. Water samples were filtered in the field using pre-combusted filters (Whatman GF/F glass fiber filter, 0.7 µm pore size) prior to being stored in 60 mL amber glass vials with Teflon-lined tops previously acid washed [16,39]. Water samples were refrigerated (about 6 • C) and stored in the dark for laboratory testing within 24 hours of collection.…”

Section: Water Sampling and Processing And Environment Variables Measmentioning

confidence: 99%

“…The first aliquot was used for DOC concentration measurements which were determined by UV-Vis absorbance using a spectrophotometer (Spectro::lyser®-S::can MESSTECHNIK GmbH, Vienna, Austria, precision ± 2%) with absorbance measured between 200 and 750 nm in increments of 2.5 nm and with results referenced to a blank spectrum derived from 18.2 MΩ Milli-Q ultrapure water. Measurements of DOC concentration were corrected using a calibration curve developed by preparing solutions of DOC concentrations known from standards obtained from the International Humic Substances Society (IHSS) [16,39]. Previous studies have found similar relationships between DOC means derived from the spectrophotometer and those determined by the combustion techniques in a TOC analyzer (Multi NC3100e, Jena Analytik AG, Germany) [39,42].…”

Section: Measurements Of Doc and Characterization Of Dom Compositionsmentioning

confidence: 99%

Streams with Riparian Forest Buffers versus Impoundments Differ in Discharge and DOM Characteristics for Pasture Catchments in Southern Amazonia

Dalmagro

Lathuillière

Sallo

et al. 2019

Water

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Forest to pasture land use change following deforestation in Southern Amazonia can result in changes to stream water quality. However, some pasture streams have riparian forest buffers, while others are dammed for farm ponds. Stream corridor management can have differential effects on hydrology and dissolved organic matter (DOM) characteristics. We examined rainfall-runoff patterns and DOM characteristics in a pasture catchment with a forested riparian buffer, and an adjacent catchment with an impoundment. Total streamflow was 1.5 times higher with the riparian buffer, whereas stormflow represented 20% of total discharge for the dammed stream versus 13% with buffer. Stream corridor management was also the primary factor related to DOM characteristics. In the impounded catchment, DOM was found to be less structurally complex, with lower molecular weight compounds, a lesser degree of humification, and a larger proportion of protein-like DOM. In the catchment with a forested buffer, DOM was dominated by humic-like components, with fluorescence characteristics indicative of DOM derived from humified soil organic matter under native vegetation. Our results suggest that differences in stream corridor management can have important implications for carbon cycling in headwater pasture catchments, and that such changes may have the potential to influence water quality downstream in the Amazon basin.

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Linking dissolved organic matter composition and bacterioplankton communities in an Amazon floodplain system

Melo

Kothawala

Bertilsson

et al. 2019

Limnology & Oceanography

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Dissolved organic matter (DOM) is the main substrate for aquatic prokaryotes, fuelling their metabolism and controlling community composition. Amazonian rivers transport and process large fluxes of terrestrial DOM, but little is known about the link between DOM composition and heterotrophic bacteria in the Amazon basin. The aims of this study were to characterize DOM composition and investigate the coupling between DOM and bacterial community composition (BCC) during a complete hydrological cycle in an Amazon floodplain system (lake Janauacá). Our study revealed a clear seasonal pattern in DOM composition through the flood pulse, which affected the amounts of autochthonous and allochthonous inputs and consequently the extent of humification, molecular weight, and aromaticity of the DOM. BCC was tightly coupled to DOM fluorescence, which was also driven by differences over the hydrological cycle, with distinct components and operational taxonomic units being simultaneously more abundant and correlating with a specific season. This coupling was particularly well reflected for three of the four identified fluorescence components, two terrestrial humic‐like components (C1 and C3) and an autochthonous component (C4). Despite clear changes in DOM composition, dissolved organic carbon concentrations tended to be relatively stable throughout the year. Overall, our results suggest that BCC shifts were associated with DOM quality but not with its quantity (that remains relatively constant throughout the year), and that bacteria preferably use labile and freshly produced DOM in lake Janauacá.

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Carbon biogeochemistry of a flooded Pantanal forest over three annual flood cycles

Cited by 16 publications

References 93 publications

Carbon Dioxide Fluxes to the Atmosphere From Waters Within Flooded Forests in the Amazon Basin

Carbon Dioxide Fluxes to the Atmosphere From Waters Within Flooded Forests in the Amazon Basin

Streams with Riparian Forest Buffers versus Impoundments Differ in Discharge and DOM Characteristics for Pasture Catchments in Southern Amazonia

Linking dissolved organic matter composition and bacterioplankton communities in an Amazon floodplain system

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