Factors Regulating the Potential for Freshwater Mineral Soil Wetlands to Function as Natural Climate Solutions

Wetlands, Journal Year: 2025, Volume and Issue: 45(1)

Published: Jan. 1, 2025

There are increasing global efforts and initiatives aiming to tackle climate change mitigate its impacts via natural solutions (NCS). Wetlands have been considered effective NCS given their capacity sequester retain atmospheric carbon dioxide (CO

Language: Английский

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Non‐Floodplain Wetlands Are Carbon‐Storage Powerhouses Across the United States

Earth s Future, Journal Year: 2025, Volume and Issue: 13(4)

Published: April 1, 2025

Abstract Understanding wetland carbon stores and dynamics are critical to managing global flux. Non‐floodplain wetlands (NFWs) hydrologically dynamic globally prevalent inland distal fluvial flowpaths, lacustrine‐fringing areas, geomorphic floodplains; >50% the world's remaining have been reported as NFWs. Quantifying NFW represents a substantive carbon‐budget gap. We analyze conterminous‐US (CONUS) field‐based data collected from nearly 2000 sites sampled by National Wetlands Condition Assessment (NWCA) representing ∼38 Mha CONUS wetlands, asking: What is mean soil organic density total storage in different hydrogeomorphically classified types? To what extent does NFWs differ other How vary between altered intact NFWs? find that relative types, carbon‐storing powerhouses, containing approximately 1.5x per ha than types sampled. CONUS‐wide, store more across every depth increment: ∼2.0x types. Further, condition affects dynamics: least impaired had 1.6x found intermediately disturbed 1.8x of most‐disturbed These NWCA data, plus waning societal protections, suggests releases destruction landscapes likely increase—perhaps markedly—in coming years (e.g., through hydrology affecting atmospheric release NFW‐stored well dissolved export).

Language: Английский

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Methane Emissions From the Qinghai‐Tibet Plateau Ponds and Lakes: Roles of Ice Thaw and Vegetation Zone

Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(4)

Published: April 1, 2024

Abstract Comprehensive seasonal observation is essential for accurately quantifying methane (CH 4 ) emissions from ponds and lakes in permafrost regions. Although CH during ice thaw are important highly variable high‐latitude freshwater (north of ∼50°N), their contribution seldom included estimates aquatic‐atmospheric exchange across different alpine ecosystems. Here, we characterized annual emissions, including thaw, four vegetation zones the Qinghai‐Tibet Plateau (QTP) region. We observed significant spatial variability emission rates (8.44−421.05 mmol m −2 yr −1 ), (0.26−144.39 to (3−33%) zones. Dissolved oxygen concentration under ice, along with substrate availability water salinity, played critical roles influencing flux thaw. estimated QTP region as 0.04 (0.03−0.05) Tg (median (first quartile−third quartile)), approximately 20% occurring Notably, average areal rate amounts only 8% that waterbodies, primarily due dominance large saline lower Our findings emphasize significance incorporating comprehensive better predicting lakes.

Language: Английский

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Osmoregulation in freshwater anaerobic methane-oxidizing archaea under salt stress

The ISME Journal, Journal Year: 2024, Volume and Issue: 18(1)

Published: Jan. 1, 2024

Climate change-driven sea level rise threatens freshwater ecosystems and elicits salinity stress in microbiomes. Methane emissions these systems are largely mitigated by methane-oxidizing microorganisms. Here, we characterized the physiological metabolic response of methanotrophic archaea to salt stress. In our microcosm experiments, inhibition started at 1%. However, during gradual increase up 3% a reactor over 12 weeks, culture continued oxidize methane. Using gene expression profiles metabolomics, identified pathway for salt-stress that produces osmolyte anaerobic archaea: N(ε)-acetyl-β-L-lysine. An extensive phylogenomic analysis on N(ε)-acetyl-β-L-lysine-producing enzymes revealed they widespread across both bacteria archaea, indicating potential horizontal transfer link BORG extrachromosomal elements. Physicochemical bioreactor biomass further indicated presence sialic acids consumption intracellular polyhydroxyalkanoates methanotrophs

Language: Английский

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Eutrophication and urbanization enhance methane emissions from coastal lagoons

Limnology and Oceanography Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 24, 2024

Abstract Coastal lagoons are important nutrient filters and carbon sinks but may release large amounts of methane (CH 4 ) to the atmosphere. Here, we hypothesize that eutrophication population density will turn coastal into stronger emitters. We report benthic fluxes from 187 sediment cores incubated three largest European suffering persistent eutrophication. Methane were mainly driven by porosity, organic matter, dissolved inorganic (DIC) fluxes. was always supersaturated (250–49,000%) in lagoon waters leading large, variable emissions 0.04–26 mg CH m −2 d −1 . Combining our new dataset with earlier estimates revealed a global emission 7.9 (1.4–34.7) Tg yr median values 5.4 Lagoons very highly populated catchments released much more (223 ). Overall, projected increases eutrophication, loading densities enhance worldwide.

Language: Английский

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Experimental Ecosystem Eutrophication Causes Offsetting Effects on Emissions of CO₂, CH₄, and N₂O from Agricultural Reservoirs

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(16), P. 7045 - 7055

Published: April 8, 2024

Despite decades of research and management efforts, eutrophication remains a persistent threat to inland waters. As nutrient pollution intensifies in the coming decades, implications for aquatic greenhouse gas (GHG) emissions are poorly defined, particularly responses individual GHGs: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O). The biogeochemical controls each can differ, making it difficult predict overall effect on net radiative forcing ecosystems. Here, we induced small nitrogen (N)-limited agricultural reservoirs measured changes diffusive GHG within before-after-control-impact (BACI) study design during June September 2021. Each exhibited unique response 300% increases primary production, with shift from an CO2 source sink, modest increase N2O flux, and, unexpectedly, no significant change CH4 emissions. lack directional CO2-equivalent fertilized summer contrasts findings empirical studies eutrophic lakes. Our illustrate difficulty extrapolating among different sized ecosystems suggest that forecast 2-fold N fertilization by 2050 may not result consistently elevated summer, at least continental grassland regions.

Language: Английский

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Mitigating inland waters’ greenhouse gas emissions: current insights and prospects

Inland Waters, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 14

Published: July 9, 2024

Language: Английский

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Estimating CO2 and CH4 fluxes from reservoirs: Model development and site-level study

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132794 - 132794

Published: Feb. 1, 2025

Language: Английский

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Agricultural Land Use Impacts Aquatic Greenhouse Gas Emissions From Wetlands in the Canadian Prairie Pothole Region

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(3)

Published: March 1, 2025

Abstract The Prairie Pothole Region (PPR) is the largest wetland complex in North America, with millions of wetlands punctuating landscapes Canada and United States. Here, have been dramatically impacted by agricultural land use, unclear implications for regional to global greenhouse gas (GHG) emissions budgets. By surveying across all three Canadian prairie provinces PPR, we show that patterns carbon dioxide (CO 2 ), methane (CH 4 nitrous oxide (N O) from aquatic habitats differ among embedded cropland versus perennial landcover. Wetlands cropped had double diffusive (20.6 ± 31.5 vs. 9.4 17.3 g CO ‐ eq m −2 d −1 ) largely driven CH . Structural equation modeling showed GHGs responded differently surrounding landscape properties. Emissions were most sensitive responding positively elevated phosphorus content lower sulfate settings, despite higher organic matter landscapes. Aquatic N O negligible, while high, but not strongly related use. While our estimates PPR high (18.2 41.4 mmol accounting fluxes vegetated soil would lead whole‐wetland rates are comparable other biomes. Our study represents an important step toward understanding emission responses use wetland‐rich

Language: Английский

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Salinity and phosphorus as key regulators of methane emissions in tropical aquaculture ponds

Aquaculture International, Journal Year: 2025, Volume and Issue: 33(4)

Published: April 30, 2025

Language: Английский

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