Spatial patterns and environmental functions of dissolved organic matter in grassland soils of China

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Июль 28, 2024

Soil dissolved organic matter (DOM) is crucial to atmospheric, terrestrial and aquatic environments as well human life. Here, by characterizing DOM from 89 grassland soils throughout China, we reveal the spatial association between geochemistry in dry season vs annual ecosystem exchange cancer cases. The humic-like high molecular weight (3.4–25 kDa) fractions with lower biodegradability, decline northern southern regions of are correlated soil respiration net productivity at continental scale. <1.2 kDa proteinaceous could serve a geographical indicator nasopharyngeal incidence mortality, while 3.4–25 humified potentially associated pancreatic cases (P < 0.05). Our findings highlight that exploiting environmental functions mitigating negative impacts necessary, require actions tailored local conditions. critical processes humans. Here authors variations different playing varied roles carbon health.

Язык: Английский

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Lena River biogeochemistry captured by a 4.5-year high-frequency sampling program

Earth system science data, Год журнала: 2025, Номер 17(1), С. 1 - 28

Опубликована: Янв. 6, 2025

Abstract. The Siberian Arctic is warming rapidly, causing permafrost to thaw and altering the biogeochemistry of aquatic environments, with cascading effects on coastal shelf ecosystems Ocean. Lena River, one largest rivers, drains a catchment dominated by permafrost. Baseline discharge data are necessary understand present future changes in land-to-ocean fluxes. Here, we high-frequency 4.5-year-long dataset from sampling program River's biogeochemistry, spanning April 2018 August 2022. comprises 587 events measurements various parameters, including water temperature, electrical conductivity, stable oxygen hydrogen isotopes, dissolved organic carbon concentration 14C, colored fluorescent matter, inorganic total nutrients, elemental ion concentrations. Sampling consistency continuity quality were ensured through simple protocols, real-time communication, collaboration local international partners. available as collection datasets separated parameter groups periods at https://doi.org/10.1594/PANGAEA.913197 (Juhls et al., 2020b). To our knowledge, this provides an unprecedented temporal resolution river's biogeochemistry. This makes it unique baseline which environmental changes, river hydrology, scales precipitation event seasonal interannual can be detected.

Язык: Английский

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DOM Associates with Greenhouse Gas Emissions in Chinese Rivers under Diverse Land Uses

Environmental Science & Technology, Год журнала: 2023, Номер 57(40), С. 15004 - 15013

Опубликована: Окт. 2, 2023

Growing evidence indicates that rivers are hotspots of greenhouse gas (GHG) emissions and play multiple roles in the global carbon budget. However, terrestrial from land use river GHG remain largely unknown. We studied microbial composition, dissolved organic matter (DOM) properties, emission responses to different landcovers (n = 100). The bacterial community was mainly constrained by land-use intensity, whereas fungal controlled DOM chemical composition (e.g., with high photoreactivity). Anthropogenic stressors gross regional domestic product, total population) were main factors affecting chromophoric (CDOM). biodegradability exhibited a positive correlation CDOM contributed activity for transformation. Variations CO2 CH4 governed biodegradation or photomineralization derived autotrophic indirectly affected via changes properties water chemistry. Because offset some climatic benefits (or ocean) sinks, intensified urban inevitably alters cycling microclimate.

Язык: Английский

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Microplastic-derived dissolved organic matter: Generation, characterization, and environmental behaviors

The Science of The Total Environment, Год журнала: 2024, Номер 948, С. 174811 - 174811

Опубликована: Июль 18, 2024

Язык: Английский

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Characterization of microplastic-derived dissolved organic matter in freshwater: Effects of light irradiation and polymer types

Environment International, Год журнала: 2024, Номер 185, С. 108536 - 108536

Опубликована: Март 1, 2024

This study investigated the impacts of light irradiation and polymer types on leaching behavior dissolved organic matter (DOM) from microplastics (MPs) in freshwater. Polypropylene had highest capacity DOM after photoaging, followed by polystyrene (PS), polyamide (PA) polyethylene terephthalate (PET). While similarly low levels were observed remaining 5 MP suspensions under UV almost all (except PA) darkness. These suggest that photooxidation some buoyant plastics may influence carbon cycling nature waters. Among 9 MP-derived leachates, PET leachates chromophoric concentration aromaticity, probably owing to special benzene rings carbonyl groups structures its fast degradation rate. Protein-like substances primary fluorescent PS), especially darkness no other found. Considering bio-labile properties proteins together, MPs regardless floating or suspended an aquatic environment have prevalent long-term effects microbial activities. Besides, monomers hexamers with newly formed chemical bonds identified UV-irradiated suspensions. results will contribute a deep insight into potential ecological related degradation.

Язык: Английский

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Molecular insights into linkages among free-floating macrophyte-derived organic matter, the fate of antibiotic residues, and antibiotic resistance genes

Journal of Hazardous Materials, Год журнала: 2024, Номер 471, С. 134351 - 134351

Опубликована: Апрель 19, 2024

Язык: Английский

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Spatial gradients and molecular transformations of DOM, DON and DOS in human-impacted estuarine sediments

Environment International, Год журнала: 2024, Номер 185, С. 108518 - 108518

Опубликована: Фев. 23, 2024

Dissolved organic matter (DOM) constitutes the most active fraction in global carbon pools, with estuarine sediments serving as significant repositories, where DOM is susceptible to dynamic transformations. Anthropogenic nitrogen (N) and sulfur (S) inputs further complicate by creating N-bearing (DON) S-bearing (DOS). This study delves into spatial gradients transformation mechanisms of DOM, DON, DOS Pearl River Estuary (PRE) sediments, China, using combined techniques UV-visible spectroscopy, Excitation-emission matrix (EEM) fluorescence Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), microbial high-throughput sequencing. Results uncovered a distinct gradient concentration, aromaticity (SUV

Язык: Английский

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Divergent Fate and Roles of Dissolved Organic Matter from Spatially Varied Grassland Soils in China During Long-Term Biogeochemical Processes

Environmental Science & Technology, Год журнала: 2024, Номер 58(2), С. 1164 - 1176

Опубликована: Янв. 2, 2024

Terrestrial dissolved organic matter (DOM) is critical to global carbon and nutrient cycling, climate change, human health. However, how the spatial compositional differences of soil DOM affect its dynamics fate in water during cycle largely unclear. Herein, biodegradation from 14 spatially distributed grassland soils China with diverse composition was investigated by 165 days incubation experiments. The results showed that although high humified fraction (high-HS) regions were featured humic-like fractions 4–25 kDa molecular weight, especially abundant condensed aromatics tannins, they unexpectedly displayed greater degradation 45–165 days. In contrast, unique proteinaceous 25–100 enriched low (low-HS) drastically depleted improved decay bulk but only 0–45 Together, high-HS would cause lower CO2 outgassing atmosphere higher loads for drinking production short term than low-HS regions. this be reversed two long-term transformation processes. These findings highlight importance temporal variability biogeochemistry mitigate negative impacts on climate, waters, humans.

Язык: Английский

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Characterizing the regional distribution, interaction with microorganisms, and sources of dissolved organic matter for summer rainfall: Insights from spectroscopy, community structure, and back-trajectory analyses

The Science of The Total Environment, Год журнала: 2024, Номер 926, С. 172086 - 172086

Опубликована: Март 29, 2024

Язык: Английский

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Meta-Analysis of Optical Surrogates for the Characterization of Dissolved Organic Matter

Environmental Science & Technology, Год журнала: 2024, Номер 58(17), С. 7380 - 7392

Опубликована: Апрель 19, 2024

Optical surrogates, derived from absorbance and fluorescence spectra, are widely used to infer dissolved organic matter (DOM) composition (molecular weight, aromaticity) genesis (autochthonous vs allochthonous). Despite the broad adoption of optical several limitations exist, such as context- sample-specific factors. These create uncertainty about how compositional interpretations based on surrogates generalized across contexts, specifically if there is duplicative or contradictory information in those interpretations. To explore these limitations, we performed a meta-analysis for DOM diverse sources, both natural systems after water treatment processes (

Язык: Английский

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