Photochemical Origins of Iron Flocculation in Acid Mine Drainage

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Сен. 13, 2024

Acid mine drainage (AMD) raises a global environmental concern impacting the iron cycle. Although formation of Fe(III) minerals in AMD-impacted waters has previously been reported to be regulated by biological processes, role abiotic processes remains largely unknown. This study first that photochemical reaction coupled with O

Язык: Английский

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Overlooking dynamics and multi-functionality of reactive minerals in soil organic carbon stabilization

Soil Ecology Letters, Год журнала: 2025, Номер 7(3)

Опубликована: Май 16, 2025

Язык: Английский

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Emerging investigator series: preferential adsorption and coprecipitation of permafrost organic matter with poorly crystalline iron minerals

Environmental Science Processes & Impacts, Год журнала: 2024, Номер 26(8), С. 1322 - 1335

Опубликована: Янв. 1, 2024

This study reports the decrease in iron-bound organic carbon quantity and change its composition thawing permafrost soils, with implications for bioavailability of dissolved pool.

Язык: Английский

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Reduced Arctic Ocean CO2 uptake due to coastal permafrost erosion

Nature Climate Change, Год журнала: 2024, Номер 14(9), С. 968 - 975

Опубликована: Авг. 12, 2024

Abstract Arctic coastal permafrost erosion is projected to increase by a factor of 2–3 2100. However, organic matter fluxes from the into ocean have not been considered in Earth system models so far. Here we represent an model and perform simulations with varying properties, such as sinking fraction nutrient content. We find that reduces Ocean CO 2 uptake atmosphere all simulations: 4.6–13.2 TgC yr −1 2100, which ~7–14% Inner uptake. show exerts positive biogeochemical feedback on climate, increasing atmospheric 1–2 per °C global surface air temperature. Our work will allow be future climate change assessments.

Язык: Английский

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Reduction of iron-organic carbon associations shifts net greenhouse gas release after initial permafrost thaw

Soil Biology and Biochemistry, Год журнала: 2025, Номер unknown, С. 109735 - 109735

Опубликована: Янв. 1, 2025

Язык: Английский

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Enhancing soil organic carbon fixation with modified bentonite composites

Applied Clay Science, Год журнала: 2025, Номер 273, С. 107837 - 107837

Опубликована: Апрель 29, 2025

Язык: Английский

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Stabilization of organic matter in topsoils under different tundra vegetation in central Spitsbergen (High Arctic)

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Апрель 29, 2025

Bacground and aims Soil organic matter (SOM) stability in Arctic soils is a key factor influencing carbon sequestration greenhouse gas emissions, particularly the context of climate change. Despite numerous studies on stocks Arctic, significant knowledge gap remains regarding mechanisms SOM stabilization their impact quantity quality across different tundra vegetation types. The main aim this study was to determine characteristics surface horizons permafrost-affected covered with types (pioneer tundra, arctic meadow, moss heath tundra) central part Spitsbergen (Svalbard).Methods Physical fractionation used separate into POM (particulate matter) MOM (mineral-associated ) fractions, while particle-size applied evaluate distribution composition sand, silt, clay fractions.Results results indicate that topsoils under fractions dominate nitrogen pools, whereas pioneer topsoils, majority are stored MAOM fractions. Moreover, substantial proportion occluded within macro- microaggregates. Furthermore, obtained from FTIR analysis revealed differences chemical properties individual soil both concerning degree occlusion aggregates particle size fractions.Conclusions This provides clear evidence significantly influence spatial Spitsbergen.

Язык: Английский

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The role of mineral mediation in organic carbon preservation and phosphorus removal in saline lake sediments of the Tibetan Plateau

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133568 - 133568

Опубликована: Май 1, 2025

Язык: Английский

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Carbon pathways in soil: unraveled by 13C natural abundance

Soil Biology and Biochemistry, Год журнала: 2025, Номер unknown, С. 109872 - 109872

Опубликована: Июнь 1, 2025

Язык: Английский

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Mercury Accumulation and Sequestration in a Deglaciated Forest Chronosequence: Insights from Particulate and Mineral-Associated Forms of Organic Matter

Environmental Science & Technology, Год журнала: 2023, Номер 57(43), С. 16512 - 16521

Опубликована: Окт. 19, 2023

Understanding mercury (Hg) complexation with soil organic matter is important in assessing atmospheric Hg accumulation and sequestration processes forest ecosystems. Separating into particulate (POM) mineral-associated (MAOM) can help the understanding of dynamics cycling due to their very different chemical constituents associated formation functioning mechanisms. The concentration Hg, carbon, nitrogen contents isotopic signatures POM MAOM a deglaciated chronosequence were determined construct sequestration. results show that are mainly derived from Hg0 deposition. up 76% higher than broadleaf forests 60% coniferous forests. vary vegetation succession. Variations δ202Hg Δ199Hg controlled by source mixing forest. Accumulation subsequent microbial reduction enrich heavier isotopes compared specific nutritional role MAOM.

Язык: Английский

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