Yedoma Permafrost Releases Organic Matter with Lesser Affinity for Cu2+ and Ni2+ as Compared to Peat from the Non-Permafrost Area: Risk of Rising Toxicity of Potentially Toxic Elements in the Arctic Ocean DOI Creative Commons
Nikita Sobolev, Konstantin S. Larionov,

Darya S. Mryasova

et al.

Toxics, Journal Year: 2023, Volume and Issue: 11(6), P. 483 - 483

Published: May 25, 2023

Pollution of the Arctic Ocean by potentially toxic elements (PTEs) is a current environmental problem. Humic acids (HAs) play an important role in regulation PTE mobility soil and water. The permafrost thaw releases ancient organic matter (OM) with specific molecular composition into watersheds. This could affect PTEs region. In our study, we isolated HAs from two types deposits: Yedoma ice complex, which contains pristine buried OM, alas formed course multiple thaw-refreezing cycles most altered OM. We also used peat non-permafrost region as recent endmember for evolution were characterized using 13C NMR elemental analysis. Adsorption experiments conducted to assess affinity binding Cu2+ Ni2+. It was found that enriched aliphatic N-containing structures compared much more aromatic oxidized HAs. adsorption have revealed higher both ions obtained data suggest substantial release OM deposits due rapid might increase their toxicity because lesser "neutralization potential".

Language: Английский

Reduction of iron-organic carbon associations shifts net greenhouse gas release after initial permafrost thaw DOI Creative Commons
Eva Voggenreiter, Laurel K. ThomasArrigo, Joachim Kilian

et al.

Soil Biology and Biochemistry, Journal Year: 2025, Volume and Issue: unknown, P. 109735 - 109735

Published: Jan. 1, 2025

Language: Английский

Citations

0
Enhancing soil organic carbon fixation with modified bentonite composites DOI
Bing Liu, Yuwen Shen, Deshui Tan

et al.

Applied Clay Science, Journal Year: 2025, Volume and Issue: 273, P. 107837 - 107837

Published: April 29, 2025

Language: Английский

Citations

0
Stabilization of organic matter in topsoils under different tundra vegetation in central Spitsbergen (High Arctic) DOI
Anna Bartos, Łukasz Musielok, Wojciech Szymański

et al.

Published: April 29, 2025

Abstract 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.

Language: Английский

Citations

0
Organic Carbon Cycling and Transformation DOI
Patrick Martin, Thomas S. Bianchi

Elsevier eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 164 - 224

Published: Sept. 13, 2023

Language: Английский

Citations

10
Emerging investigator series: preferential adsorption and coprecipitation of permafrost organic matter with poorly crystalline iron minerals DOI Creative Commons
Eva Voggenreiter, Philippe Schmitt‐Kopplin, Laurel K. ThomasArrigo

et al.

Environmental Science Processes & Impacts, Journal Year: 2024, Volume and Issue: 26(8), P. 1322 - 1335

Published: Jan. 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.

Language: Английский

Citations

3
Reduced Arctic Ocean CO2 uptake due to coastal permafrost erosion DOI Creative Commons
David Nielsen, Fatemeh Chegini, Joeran Maerz

et al.

Nature Climate Change, Journal Year: 2024, Volume and Issue: 14(9), P. 968 - 975

Published: Aug. 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.

Language: Английский

Citations

3
Deciphering the Intricate Control of Minerals on Deep Soil Carbon Stability and Persistence in Alaskan Permafrost DOI
Yixuan Guo, Guanghui Yu, Shuijin Hu

et al.

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(10)

Published: Oct. 1, 2024

ABSTRACT Understanding the fate of organic carbon in thawed permafrost is crucial for predicting climate feedback. While minerals and microbial necromass are known to play roles long‐term stability subsoils, their exact influence on persistence Arctic remains uncertain. Our study, combining radiocarbon dating biomarker analyses, showed that soil Alaskan had millennial‐scale ages contained only 10%–15% carbon, significantly lower than global average ~30%–60%. This ancient exhibited a weak correlation with reactive but stronger mineral weathering (reactive iron total ratio). Peroxidase activity displayed high coefficient ( p < 10 −6 ) Δ 14 C δ 13 C, indicating its strong predictive power persistence. Further, positive between peroxidase polysaccharides indicates increased may promote protection plant residues, potentially by fostering formation mineral‐organic associations. protective role surfaces biopolymers was further supported examining 1451 synchrotron radiation infrared spectra from aggregates, which revealed OH groups functional at submicron scale. An incubation experiment moisture contents, particularly within 0%–40% range, elevated activity, suggesting soils vulnerable moisture‐induced destabilization. Collectively, this study offers mechanistic insights into soils, essential refining carbon‐climate feedbacks.

Language: Английский

Citations

2
Mercury Accumulation and Sequestration in a Deglaciated Forest Chronosequence: Insights from Particulate and Mineral-Associated Forms of Organic Matter DOI
Fei Wu, Luhan Yang, Xun Wang

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(43), P. 16512 - 16521

Published: Oct. 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.

Language: Английский

Citations

5
Effects of gamma(γ)-irradiation on the physicochemical properties and bioavailability of iron oxyhydroxides coprecipitated with varying concentrations of Na-alginate DOI Creative Commons

Tarek Najem,

Prachi Joshi, Andreas Kappler

et al.

Chemical Geology, Journal Year: 2024, Volume and Issue: 662, P. 122235 - 122235

Published: June 17, 2024

This study investigated the impacts of γ-radiation at a final dose 25 kGy on physicochemical properties range wet iron oxyhydroxides (2-line ferrihydrite, lepidocrocite, and goethite) synthesized in presence varying concentrations polysaccharide Na-alginate (starting solutions containing C/Fe ratios 0, 0.5, 1.0, 1.5). The degree impact to minerals was examined by chemical extractions, various analytical techniques including XRD, FTIR-ATR, Mössbauer spectroscopy, N2 adsorption-desorption isotherms, as well assessing their bioavailability towards model Fe(III) reducing bacteria Shewanella putrefaciens CN32. Across all coprecipitates studied, it found that γ-irradiation led substantial dissolution Fe concomitant release Fe(II) alginate into solution. Despite this observation, bulk mineralogy crystallinity studied oxyhydroxides, determined XRD did not appear change. However, analyses via spectroscopy (77 5 K) revealed 2-line ferrihydrites increased post-irradiation. Moreover, among specific surface area porosity decreased for only post-irradiated ferrihydrite with ratio 0.5 or 1.0. bioreduction rates irradiated counterparts significantly differ, whereas extent (C/Fe 1.5) exhibited significant increase up 28%. In contrast, reduction select lepidocrocite 0.5) goethite slightly higher than corresponding native controls. observed differences between were attributed irradiation induced alteration particle aggregation coagulation size visual observations. summary, findings suggest even low total kGy, can lead changes relatively organic matter content. Therefore, future research designed investigate matter-Fe composite systems natural samples should be cognizant potential effects sterilization through γ-irradiation. These could potentially result inaccurate over- under- estimations matter, possible adsorption capacity contaminants.

Language: Английский

Citations

1
Major overlap in plant and soil organic carbon hotspots across Africa DOI Creative Commons
Ndiye Michael Kebonye, Kingsley John, Manuel Delgado‐Baquerizo

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 175476 - 175476

Published: Aug. 13, 2024

Terrestrial plant and soil organic carbon stocks are critical for regulating climate change, enhancing fertility, supporting biodiversity. While a global-scale decoupling between has been documented, the hotspots interconnections these two compartments across Africa, second-largest continent on planet, have significantly overlooked. Here, we compiled over 10,000 existing observations to generate high-resolution map, illustrating distribution pattern of in Africa. We then showed that above- below-ground positively correlated with Both shared major tropical regions. Our study provides insights into spatial essential conservation safeguarding terrestrial amidst challenges change.

Language: Английский

Citations

1