Observations of Greenhouse Gases and Nitrate Concentrations in a Maine River and Fringing Wetland

Bresney, S.; Moseman‐Valtierra, Serena; Snyder, Noah P.

doi:10.1656/045.022.0125

Cited by 3 publications

(5 citation statements)

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“…, Bresney et al. ). Focused groundwater discharge can create small‐scale spatial heterogeneity in CH 4 (Jones and Mulholland , Hope et al.…”

Section: A Framework For Controls On Ch4 In Streams and Riversmentioning

confidence: 99%

“…Because deposition of fine materials and reduction of gas exchange both occur in low‐gradient channel sections and both favor CH 4 accumulation, it is difficult to separate out the relative importance of these two mechanisms (Bresney et al. ). And as with patterns of sediment distribution, topographic effects on gas exchange can occur at scales of just a few meters in association with short, steep, channel sections with high reaeration rates (Lilley et al.…”

Section: A Framework For Controls On Ch4 In Streams and Riversmentioning

confidence: 99%

See 1 more Smart Citation

The ecology of methane in streams and rivers: patterns, controls, and global significance

Stanley

Casson

Christel

et al. 2016

Ecological Monographs

427

335

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Streams and rivers can substantially modify organic carbon (OC) inputs from terrestrial landscapes, and much of this processing is the result of microbial respiration. While carbon dioxide (CO2) is the major end‐product of ecosystem respiration, methane (CH4) is also present in many fluvial environments even though methanogenesis typically requires anoxic conditions that may be scarce in these systems. Given recent recognition of the pervasiveness of this greenhouse gas in streams and rivers, we synthesized existing research and data to identify patterns and drivers of CH4, knowledge gaps, and research opportunities. This included examining the history of lotic CH4 research, creating a database of concentrations and fluxes (MethDB) to generate a global‐scale estimate of fluvial CH4 efflux, and developing a conceptual framework and using this framework to consider how human activities may modify fluvial CH4 dynamics. Current understanding of CH4 in streams and rivers has been strongly influenced by goals of understanding OC processing and quantifying the contribution of CH4 to ecosystem C fluxes. Less effort has been directed towards investigating processes that dictate in situ CH4 production and loss. CH4 makes a meager contribution to watershed or landscape C budgets, but streams and rivers are often significant CH4 sources to the atmosphere across these same spatial extents. Most fluvial systems are supersaturated with CH4 and we estimate an annual global emission of 26.8 Tg CH4, equivalent to ~15‐40% of wetland and lake effluxes, respectively. Less clear is the role of CH4 oxidation, methanogenesis, and total anaerobic respiration to whole ecosystem production and respiration. Controls on CH4 generation and persistence can be viewed in terms of proximate controls that influence methanogenesis (organic matter, temperature, alternative electron acceptors, nutrients) and distal geomorphic and hydrologic drivers. Multiple controls combined with its extreme redox status and low solubility result in high spatial and temporal variance of CH4 in fluvial environments, which presents a substantial challenge for understanding its larger‐scale dynamics. Further understanding of CH4 production and consumption, anaerobic metabolism, and ecosystem energetics in streams and rivers can be achieved through more directed studies and comparison with knowledge from terrestrial, wetland, and aquatic disciplines.

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“…, Bresney et al. ). Focused groundwater discharge can create small‐scale spatial heterogeneity in CH 4 (Jones and Mulholland , Hope et al.…”

Section: A Framework For Controls On Ch4 In Streams and Riversmentioning

confidence: 99%

Section: A Framework For Controls On Ch4 In Streams and Riversmentioning

confidence: 99%

The ecology of methane in streams and rivers: patterns, controls, and global significance

Stanley

Casson

Christel

et al. 2016

Ecological Monographs

427

335

View full text Add to dashboard Cite

show abstract

“…But hydrologic linkage to suitable habitats can deliver CH 4 to the channel, and in fact, many studies point to CH 4 production outside the active channel boundaries. Examples of hydrologic linkages that deliver CH 4 include shallow groundwater flows that travel from saturated soils or peat deposits to the channel (Jones and Mulholland 1998a, Hope et al 2001, Crawford et al 2014b, water passing through hyporheic sediments (Baker et al 1994, Schindler and Krabbenhoft 1998, Anthony et al 2012, and connection to inundated floodplains (Richey et al 1988, Pulliam 1993, Teodoru et al 2015 or adjacent wetlands (Crawford et al 2013, Bresney et al 2015. Focused groundwater discharge can create small-scale spatial heterogeneity in CH 4 Mulholland 1998a, Hope et al 2001), but largerscale patterns may also emerge associated with gradual changes in the relative contribution of groundwater that occur along a river continuum (Jones and Mulholland 1998b).…”

Section: Distal Controlsmentioning

confidence: 99%

“…Channel slope also exerts another critical direct control on CH 4 by affecting gas exchange (Raymond et al 2012). Because deposition of fine materials and reduction of gas exchange both occur in low-gradient channel sections and both favor CH 4 accumulation, it is difficult to separate out the relative importance of these two mechanisms (Bresney et al 2015). And as with patterns of sediment distribution, topographic effects on gas exchange can occur at scales of just a few meters in association with short, steep, channel sections with high reaeration rates (Lilley et al 1996) to more drawn out longitudinal shifts in the channel profile occurring over several kilometers (Butman and Raymond 2011).…”

Section: Distal Controlsmentioning

confidence: 99%

The ecology of methane in streams and rivers: patterns, controls, and global significance

Stanley¹,

Casson²,

Christel³

et al. 2015

Ecological Monographs

169

315

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Growing awareness of ongoing and rapid changes in Earth's carbon cycle is motivating a new era of research aimed at improving our understanding of ecosystems as both responders to, and drivers of larger-scale biogeochemical dynamics. In the case of streams and rivers, this has often taken the form of elucidating their role as processors of organic carbon (OC), a capacity that far exceeds their meager size and significantly influences the export of continental OC to marine environments (Cole et al. 2007, Battin et al. 2009, Aufdenkampe et al. 2011). Amplified OC processing has been inferred from observations of smaller export loads relative to inputs, rates of ecosystem respiration that exceed gross primary production, and/or occurrence of supersaturated concentrations of the products of OC decomposition, namely, carbon dioxide (CO 2) and methane (CH 4).

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“…Higher CH 4 and N 2 O concentrations typically exist in urban, wetland, and agricultural watersheds, which also have higher DOC, nitrate, and ammonium (Beaulieu et al 2008(Beaulieu et al , 2009Stanley et al 2016;Herreid et al 2021). Wetlands tend to accumulate fine sediment that become anoxic and thereby conducive to methane production, and agricultural and urban areas can contribute organic matter, nutrients, and fine sediment to the stream channel (Bresney et al 2015;Stanley et al 2016). The NEON dataset had limited landcover variation among catchments, with few watersheds having any substantial wetland, agricultural, or urban landcover (Fig.…”

Section: Comparison To Existing Regional and Global Analysesmentioning

confidence: 99%

Variability and drivers of CO₂, CH₄, and N₂O concentrations in streams across the United States

DelVecchia

Rhea

Aho

et al. 2022

Limnology & Oceanography

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Streams and rivers are major sources of greenhouse gases (GHGs) to the atmosphere, as carbon and nitrogen are converted and outgassed during transport. Although our understanding of drivers of individual GHG fluxes has improved with numerous site‐specific studies and global‐scale compilations, our ability to parse out interrelated physical and biogeochemical drivers of gas concentrations is limited by a lack of consistently collected, temporally continuous samples of GHGs and their associated drivers. We present a first analysis of such a dataset collected by the National Ecological Observatory Network across 27 streams and rivers across ecoclimatic domains of the United States. Average concentrations of CO2 ranged from 36.9 ± 0.88 to 404 ± 33 μmol L−1, CH4 from 0.003 ± 0.0003 to 4.99 ± 0.72 μmol L−1, and N2O from 0.015 to 0.04 μmol L−1 and spanned ranges of previous global compilations. Both CO2 and CH4 were strongly affected by physical drivers including mean air temperature and stream slope, as well as by dissolved oxygen and total nitrogen concentrations. N2O was exclusively correlated with total nitrogen concentrations. Results suggested that potential for gas exchange dominated patterns in gas concentrations at the site level, but contributions of in‐stream aerobic and anaerobic metabolism, and groundwater also likely varied across sites. The highest gas concentrations as well as highest variability occurred in low‐gradient, warmer, and nonperennial systems. These results are a first step in providing unprecedented, continuous estimates of GHG flux constrained by temporally variable physical and biogeochemical drivers of GHG production.

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Observations of Greenhouse Gases and Nitrate Concentrations in a Maine River and Fringing Wetland

Cited by 3 publications

References 49 publications

The ecology of methane in streams and rivers: patterns, controls, and global significance

The ecology of methane in streams and rivers: patterns, controls, and global significance

The ecology of methane in streams and rivers: patterns, controls, and global significance

Variability and drivers of CO₂, CH₄, and N₂O concentrations in streams across the United States

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Observations of Greenhouse Gases and Nitrate Concentrations in a Maine River and Fringing Wetland

Cited by 3 publications

References 49 publications

The ecology of methane in streams and rivers: patterns, controls, and global significance

The ecology of methane in streams and rivers: patterns, controls, and global significance

The ecology of methane in streams and rivers: patterns, controls, and global significance

Variability and drivers of CO2, CH4, and N2O concentrations in streams across the United States

Contact Info

Product

Resources

About

Variability and drivers of CO₂, CH₄, and N₂O concentrations in streams across the United States