Global methane emissions from rivers and streams

Nature, Journal Year: 2023, Volume and Issue: 621(7979), P. 530 - 535

Published: Aug. 16, 2023

Methane (CH4) is a potent greenhouse gas and its concentrations have tripled in the atmosphere since industrial revolution. There evidence that global warming has increased CH4 emissions from freshwater ecosystems1,2, providing positive feedback to climate. Yet for rivers streams, controls magnitude of remain highly uncertain3,4. Here we report spatially explicit estimate running waters, accounting 27.9 (16.7-39.7) Tg per year roughly equal those other systems5,6. Riverine are not strongly temperature dependent, with low average activation energy (EM = 0.14 eV) compared lakes wetlands 0.96 eV)1. By contrast, patterns characterized by large fluxes high- low-latitude settings as well human-dominated environments. These explained edaphic climate features linked anoxia near fluvial habitats, including high supply organic matter water saturation hydrologically connected soils. Our results highlight importance land-water connections regulating which vulnerable only direct human modifications but also several change responses on land.

Language: Английский

---

Inland Water Greenhouse Gas Budgets for RECCAP2: 1. State‐Of‐The‐Art of Global Scale Assessments

Global Biogeochemical Cycles, Journal Year: 2023, Volume and Issue: 37(5)

Published: April 26, 2023

Abstract Inland waters are important emitters of the greenhouse gasses (GHGs) carbon dioxide (CO 2 ), methane (CH 4 and nitrous oxide (N O) to atmosphere. In framework 2nd phase REgional Carbon Cycle Assessment Processes (RECCAP‐2) initiative, we review state art in estimating inland water GHG budgets at global scale, which has substantially advanced since first RECCAP nearly 10 years ago. The development increasingly sophisticated upscaling techniques, including statistical prediction process‐based models, allows for spatially explicit estimates that needed regionalized assessments continental such as those established RECCAP. A few recent also resolve seasonal and/or interannual variability emissions. Nonetheless, global‐scale assessment emissions remains challenging because limited spatial temporal coverage observations persisting uncertainties abundance distribution surface areas. To decrease these uncertainties, more empirical work on contributions hot‐spots hot‐moments overall is particularly needed.

Language: Английский

---

River network‐scale drying impacts the spatiotemporal dynamics of greenhouse gas fluxes

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(4), P. 861 - 873

Published: Feb. 22, 2024

Abstract Rivers significantly contribute to global biogeochemical cycles; however, we have a limited understanding of how drying may influence these cycles. Drying fragments river networks, thereby influencing important ecosystem functions such as the processing carbon and nitrogen, associated fluxes greenhouse gases (GHGs) both locally, at network scale. Our objective was assess, using network‐scale approach, lateral, longitudinal, temporal dynamics GHG in naturally fragmented by drying. We used closed‐loop chamber with automated analyzers measure dioxide (CO 2 ), methane (CH 4 nitrous oxide (N O) from dry sediments, flowing waters, isolated pools, riparian soils, along suite environmental variables, over 9 months 20 sites across non‐perennial France. Network‐scale had spatial legacy effect on fluxes. On average, CO were up 29 times higher perennial than under conditions. At sites, N O positively covaried time since rewetting. In addition, percent reaches upstream, indicating soil riverbed sediments markedly different magnitudes covariates. This research demonstrates that not only has local‐scale impact but also influences scale, contributing valuable insights for upscaling riverine estimates.

Language: Английский

---

The end of an entire biome? World's largest wetland, the Pantanal, is menaced by the Hidrovia project which is uncertain to sustainably support large-scale navigation

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 908, P. 167751 - 167751

Published: Oct. 30, 2023

Language: Английский

---

Lake ecosystem tipping points and climate feedbacks

Earth System Dynamics, Journal Year: 2024, Volume and Issue: 15(3), P. 653 - 669

Published: May 27, 2024

Abstract. Lakes and ponds experience anthropogenically forced changes that may be non-linear sometimes initiate ecosystem feedbacks leading to tipping points beyond which impacts become hard reverse. In many cases climate change is a key driver, in concert with other stressors. are also important players the global by ventilating large share of terrestrial carbon (C) back atmosphere as greenhouse gases will likely provide substantial change. this paper we address various major lake ecosystems discuss if can identified, predicted, or prevented, well drivers associated We focus on potential large-scale effects regional widespread impacts, such eutrophication-driven anoxia internal phosphorus (P) loading, increased loading organic matter from (lake “browning”), formation disappearance response cryosphere shifts precipitation evaporation ratios, switching nitrogen limitation, salinization, spread invasive species where threshold-type occur. identify systems could lead self-sustaining feedbacks, abrupt changes, some degree resilience, opposed binary states not subject self-propelling resilience. Changes driven warming, browning, eutrophication cause stratification, heterotrophy (browning), phytoplankton macrophyte mass (eutrophication), separately collectively drive benthic oxygen depletion turn increase gas (GHG) emissions. Several these processes feature point thresholds, further warming make easier surpass. argue full importance vulnerability lakes anthropogenic their feedback climate, yet fully acknowledged, so there need both for science communication regard.

Language: Английский

---

Phosphorus control and dredging decrease methane emissions from shallow lakes

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 847, P. 157584 - 157584

Published: July 23, 2022

Freshwater ecosystems are an important source of the greenhouse gas methane (CH4), and their emissions expected to increase due eutrophication. Two commonly applied management techniques reduce eutrophication addition phosphate-binding lanthanum modified bentonite (LMB, trademark Phoslock©) dredging, but effect on CH4 is still poorly understood. Here, this study researched how LMB dredging affected using a full-factorial mesocosm design monitored for 18 months. The was tested by measuring diffusive ebullitive fluxes, plant community composition, methanogen methanotroph activity range physicochemical water sediment variables. decreased total emissions, while showed trend towards decreasing emissions. Total in all mesocosms were much higher summer second year, likely because algal decomposition organic matter availability. First, lowered P-availability, which reduced coverage floating fern Azolla filiculoides, thereby prevented anoxia surface NH4+ concentrations, lowering production rates. Second, first summer, possibly it removed methanogenic community, year preventing autumn winter die-off rooted macrophyte Potamogeton cripsus. Finally, composition related O2, porewater phosphorus, content. To conclude, not only improve quality, also decrease mitigating climate change.

Language: Английский

---

Diurnal versus spatial variability of greenhouse gas emissions from an anthropogenically modified lowland river in Germany

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(6), P. 1613 - 1628

Published: March 28, 2024

Abstract. Greenhouse gas (GHG) emissions from rivers are globally relevant, but quantification of these comes with considerable uncertainty. Quantification ecosystem-scale is challenged by both spatial and short-term temporal variability. We measured spatio-temporal variability CO2 CH4 fluxes a 1 km long reach the lowland river Elbe in Germany over 3 d to establish which factor more relevant be taken into consideration: small-scale or fluxes. GHG studied were dominated CO2, 90 % total water surface, while 10 dry fallen sediment at side river. Aquatic similar different habitats, aquatic higher Artificial structures improve navigability (groynes) created still areas elevated lower exhibited clear diurnal pattern, exact shape timing this pattern differed between habitats. By contrast, did not change diurnally. Our data confirm our hypothesis that especially important for CH4, study summer. Continuous measurements least sampling times day most likely necessary reliable emissions.

Language: Английский

---

Greenhouse gas dynamics in river networks fragmented by drying and damming

Freshwater Biology, Journal Year: 2023, Volume and Issue: 68(12), P. 2027 - 2041

Published: Sept. 19, 2023

Abstract River fragmentation by drying and damming is occurring more frequently in the Anthropocene era, yet there limited knowledge of how this influences greenhouse gas (GHG) fluxes river networks. networks have potential to be important sources GHGs atmosphere through both similar dissimilar mechanisms associated with temporary (drying) permanent (damming) fragmentation. We conducted a review literature found 49, 43 six studies about (CO 2 , CH 4 N O) rivers impacted damming, their interaction, respectively. research lacking non‐arid climates small water‐retention structures for regarding The major factors directly influencing GHG were sediment moisture, temperature, organic matter content texture. In most influential water dissolved oxygen, phytoplankton Chlorophyll‐ . Based on our meta‐ecosystem theory, we propose that spatial distribution strongly at river‐network scale. actionable future directions identified here will help improve understanding effects fluxes, inform management climate change mitigation strategies.

Language: Английский

---

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

---

The effect of water table fluctuation on 12 Sphagnum species during establishment: implications for peatland restoration and paludiculture

Restoration Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Sphagnum mosses are vital to bog ecosystems and are, therefore, target species for peatland restoration paludiculture. Their establishment relies on consistent wet conditions adequate nutrient supply. However, extreme climatic events, such as prolonged droughts, threaten establishment. To better understand the effects of water table fluctuations different species, we conducted a field experiment with stable fluctuating conditions. After 1 year, measured cover, lawn height (as proxy growth), carbon (C) accumulation, stoichiometry 12 species. Our results show that facilitated growth during Nitrogen (N) potassium (K) N phosphorus (P) quotients were higher in capitula biomass treatment. We identified two clusters species: cluster 1, characterized by low N:K quotient C accumulation—indicating strong potential—included palustre , S. fallax fimbriatum riparium denticulatum . In contrast, 2 exhibited lower accumulation—suggesting vulnerability environmental changes establishment—included fuscum centrale magellanicum papillosum rubellum austinii squarrosum indicate particularly promising candidates rapid under dry Even when exposed shortages, paludiculture can promote fast‐track accumulation.

Language: Английский

---