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Schindler, John E.; Krabbenhoft, David P.

doi:10.1023/a:1006005311257

Cited by 113 publications

(15 citation statements)

References 23 publications

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“…Our results highlight the substantial potential for streambed sediments from agricultural lowland rivers to produce significant amounts of CO 2 and CH 4 . We sampled only the top of the streambed (see Methods), although respiration can also occur at greater depths in the streambed, depending on availability of OM and oxic/anoxic zonation. ,,, Especially the presence of dissolved oxygen is normally driven by exchanging streamwater in natural streambeds (see Experimental Limitations) and is an important control on MMA. Substantial MMA and CO 2 and CH 4 production was observed that was in a similar range to in situ forest stream sediments and ponds and lower than CO 2 and CH 4 production from Mediterranean stream sediment incubations …”

Section: Resultsmentioning

confidence: 99%

Streambed Organic Matter Controls on Carbon Dioxide and Methane Emissions from Streams

Romeijn

Comer‐Warner

Ullah

et al. 2019

Environ. Sci. Technol.

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Greenhouse gas (GHG) emissions of carbon dioxide (CO2) and methane (CH4) from streambeds are currently understudied. There is a paucity of research exploring organic matter (OM) controls on GHG production by microbial metabolic activity in streambeds, which is a major knowledge gap given the increased inputs of allochthonous carbon to streams, especially in agricultural catchments. This study aims to contribute to closing this knowledge gap by quantifying how contrasting OM contents in different sediments affect streambed GHG production and associated microbial metabolic activity. We demonstrate, by means of an incubation experiment, that streambed sediments have the potential to produce substantial amounts of GHG, controlled by sediment OM quantity and quality. We observed streambed CO2 production rates that can account for 35% of total stream evasion estimated in previous studies, ranging between 1.4 and 86% under optimal conditions. Methane production varied stronger than CO2 between different geologic backgrounds, suggesting OM quality controls between streambed sediments. Moreover, our results indicate that streambed sediments may produce much more CO2 than quantified to date, depending on the quantity and quality of the organic matter, which has direct implications for global estimates of C fluxes in stream ecosystems.

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Section: Resultsmentioning

confidence: 99%

Streambed Organic Matter Controls on Carbon Dioxide and Methane Emissions from Streams

Romeijn

Comer‐Warner

Ullah

et al. 2019

Environ. Sci. Technol.

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“…Previous studies have demonstrated that morphological characteristics of the meander, including sinuosity and topography, can change the residence time of geochemical species in the hyporheic zone, although mostly under steady state conditions (Boano et al, 2010;Brosofske et al, 1997;Naiman & Decamps, 1997;Schindler & Krabbenhoft, 1998;Stonedahl et al, 2010;Tonina & Buffington, 2007;Zarnetske et al, 2011).…”

Section: Caveats and Future Model Developmentmentioning

confidence: 99%

“…At the meander scale, various geomorphological characteristics, including sinuosity, topography, bars, pool-riffle sequences, and bed forms, can influence hydrological and biogeochemical processes (Brosofske et al, 1997;Naiman & Decamps, 1997;Stonedahl et al, 2010;Tonina & Buffington, 2007). These processes can alter the residence time of chemical species in the hyporheic zone, thereby influencing the biogeochemical processes (Boano et al, 2010;Schindler & Krabbenhoft, 1998;Zarnetske et al, 2011). In the past decade, several studies have been conducted to investigate the links between the rates of biogeochemical transformations and river morphology using the residence time concept, albeit mostly under steady state conditions (e.g., Bardini et al, 2012;Boano et al, 2010;Marzadri et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Geochemical Exports to River From the Intrameander Hyporheic Zone Under Transient Hydrologic Conditions: East River Mountainous Watershed, Colorado

Dwivedi

Steefel

Arora

et al. 2018

Water Resources Research

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To understand how redox processes influence carbon, nitrogen, and iron cycling within the intrameander hyporheic zone, we developed a biotic and abiotic reaction network and incorporated it into the reactive transport simulator PFLOTRAN. Two‐dimensional reactive flow and transport simulations were performed (1) to evaluate how transient hydrological conditions control the lateral redox zonation within an intrameander region of the East River in Colorado and (2) to quantify the impact of a single meander on subsurface exports of carbon and other geochemical species to the river. The meander's overall contribution to the river was quantified by integrating geochemical outfluxes along the outside of the meander bend. The model was able to capture the field‐observed trends of dissolved oxygen, nitrate, iron, pH, and total inorganic carbon along a 2‐D transect. Consistent with field observations, simulated dissolved oxygen and nitrate decreased along the intrameander flow paths while iron (Fe2+) concentration increased. The simulation results further demonstrated that the reductive potential of the lateral redox zonation was controlled by groundwater velocities resulting from river stage fluctuations, with low‐water conditions promoting reducing conditions. The sensitivity analysis results showed that permeability had a more significant impact on biogeochemical zonation compared to the reaction pathways under transient hydrologic conditions. The simulation results further indicated that the meander acted as a sink for organic and inorganic carbon as well as iron during the extended baseflow and high‐water conditions; however, these geochemical species were released into the river during the falling limb of the hydrograph.

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“…is evidence that groundwaters are a major source of CH 4 to streams Jones & Mulholland, 1998;Rasilo et al, 2017), in addition to that produced internally (Schindler & Krabbenhoft, 1998), and this would explain in part the covariation between CH 4 and CO 2 , since both may share a predominantly soil origin. In contrast to the pattern observed for CO 2 , however, pCH 4 did not consistently decline with downstream distance, despite the fact that both gases are subject to the physical forcing throughout the network, suggesting that the replenishment of CH 4 from local stream sources, likely the stream bed, roughly offsets degassing throughout the fluvial continuum.…”

Section: Large-scale Patterns and Importance Of Regional Climate For mentioning

confidence: 99%

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

Hutchins

Prairie

Giorgio

2019

Global Biogeochemical Cycles

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The boreal biome is characterized by extremely dense and complex fluvial networks that are closely coupled to land. Reconstructing the role that these fluvial networks play in regional carbon (C) budgets requires identifying landscape and environmental drivers of riverine C that operate at the whole network scale and that can be applied across landscapes. Here we explore drivers of CO2, CH4, and dissolved organic (DOC) and inorganic C (DIC) across 190 streams and rivers spanning 8 Strahler orders over an area of 500,000 km2 of heterogeneous boreal landscape in Québec, focusing on those drivers that can be readily obtained from remote sensing data. Each C species (except DIC) could be modeled as a function of a proximal network‐scale property, such as flow distance or elevation, but adding regional structure to these models greatly improved predictions. These modeled regional effects were similar for DOC, CO2, and CH4 and were strongly related to average regional soil organic content and especially to NPP, the latter integrating regional differences in climate and other environmental factors. These results suggest that there may be regional C baselines determined by a combination of landscape and climate features, which simultaneously influence the average CO2, DOC, and CH4 within fluvial networks, albeit through different underlying mechanisms and with varying degrees of influence on each C species. The latter two C species appear to be more sensitive to regional differences in soil, NPP, and climate than CO2 or DIC, and therefore more likely to shift under future scenarios of change in northern landscapes.

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Untitled

Cited by 113 publications

References 23 publications

Streambed Organic Matter Controls on Carbon Dioxide and Methane Emissions from Streams

Streambed Organic Matter Controls on Carbon Dioxide and Methane Emissions from Streams

Geochemical Exports to River From the Intrameander Hyporheic Zone Under Transient Hydrologic Conditions: East River Mountainous Watershed, Colorado

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

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Untitled

Cited by 113 publications

References 23 publications

Streambed Organic Matter Controls on Carbon Dioxide and Methane Emissions from Streams

Streambed Organic Matter Controls on Carbon Dioxide and Methane Emissions from Streams

Geochemical Exports to River From the Intrameander Hyporheic Zone Under Transient Hydrologic Conditions: East River Mountainous Watershed, Colorado

Large‐Scale Landscape Drivers of CO2, CH4, DOC, and DIC in Boreal River Networks

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Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks