Isotopic and spectral signatures unravel the sources, preservation and degradation of sedimentary organic matter in the Dongzhai Harbor mangrove estuary, southern China

Journal of Hydrology, Год журнала: 2023, Номер 618, С. 129256 - 129256

Опубликована: Фев. 10, 2023

Язык: Английский

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Characteristics of dissolved organic matter contribute to Geogenic ammonium enrichment in coastal versus alluvial-lacustrine aquifers

Water Research, Год журнала: 2023, Номер 250, С. 121025 - 121025

Опубликована: Дек. 16, 2023

Язык: Английский

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Molecular characteristics of dissolved organic phosphorus in watershed runoff: Coupled influences of land use and precipitation

Journal of Environmental Sciences, Год журнала: 2024, Номер 148, С. 387 - 398

Опубликована: Фев. 1, 2024

Язык: Английский

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Mechanisms controlling spatial variability of geogenic ammonium in coastal aquifers: Insights from Holocene sedimentary evolution

Water Research, Год журнала: 2025, Номер 274, С. 123124 - 123124

Опубликована: Янв. 10, 2025

Язык: Английский

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Dissolved Inorganic Carbon Evolution of Sediment Porewater in the Huixian Wetland, Southwest China

Ground Water, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

Wetlands, as crucial terrestrial carbon reservoirs, have recently suffered severe degradation due to intense human activities. Lacustrine sediments serve vital indicators for understanding wetland environmental changes. In the current paper, porewater samples were extracted from lacustrine sediment in three boreholes with a depth of ~75 cm Huixian karst wetland, southwest China, study chemical and dissolved inorganic (DIC) evolution under anthropogenic influence. Two are situated beneath Mudong Lake, while other one is degraded area. The results show that central region Lake natural HCO3-Ca type water recharged by groundwater evidenced depleted 2H -18O isotopes. Methanogenesis prevails this area, suggested positive δ13C values ranging 4.29‰ 7.05‰. However, shallow at western edge exhibit significantly higher concentrations NO3 - SO4 2-, resulting agricultural input influenced oxidation pyrite. These processes lead decrease methane production generate DIC through organic fertilizer carbonate weathering sulfuric acid, thereby altering values. types mixing observed based on increasing depth, which can be attributed unique subsystems. This work highlights potential impact human-induced variations fate DIC, particularly environments.

Язык: Английский

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Groundwater sulfate in the Pearl River Delta driven by urbanization: Spatial distribution, sources and factors

Applied Geochemistry, Год журнала: 2023, Номер 156, С. 105766 - 105766

Опубликована: Авг. 9, 2023

Язык: Английский

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Tidal Pumping Controls Dissolved Organic Matter Properties and Outwelling From Mangrove Groundwater to Coastal Water

Water Resources Research, Год журнала: 2023, Номер 59(3)

Опубликована: Март 1, 2023

Abstract Dissolved organic matter (DOM) in highly productive intertidal mangroves is an important carbon and nutrient source to the coastal ocean. In dynamic mangrove systems, both tidal pumping or geochemical factors can control DOM characteristics. The influence of groundwater flow on properties fluxes remains poorly understood. Here, we compared concentrations, sources, spectroscopic characteristics across a recharge‐discharge gradient. We used three‐dimensional array sampling strategy reduce spatial biases, monitoring quantify tidally driven exchange, spectrofluoroscopy fluorescent components. results showed that hydrology played key role driving horizontal (i.e., from sea) vertical directions. Due high heterogeneity dissolved inorganic (DIC) (DOC) concentrations groundwater, outwelling degree variability at scale (54.8–234.8 μmol m −2 d −1 for DIC 2.5–12.4 DOC). contribution terrestrial gradually decreased toward ocean, but microbial contributions recently produced autochthonous increased. Deep received less experienced anaerobic mineralization, resulting lower than shallow groundwater. Greater variations were found deep Overall, surface water‐groundwater interactions how contributes budgets sequestration

Язык: Английский

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Contrastive mechanisms of groundwater ammonium enrichment in different hydrogeologic settings

The Science of The Total Environment, Год журнала: 2023, Номер 875, С. 162542 - 162542

Опубликована: Март 3, 2023

Язык: Английский

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Geogenic Phosphorus Enrichment in Groundwater due to Anaerobic Methane Oxidation-Coupled Fe(III) Oxide Reduction

Environmental Science & Technology, Год журнала: 2024, Номер 58(18), С. 8032 - 8042

Опубликована: Апрель 26, 2024

Accumulation of geogenic phosphorus (P) in groundwater is an emerging environmental concern, which closely linked to coupled processes involving FeOOH and organic matter under methanogenic conditions. However, it remains unclear how P enrichment associated with methane cycling, particularly the anaerobic oxidation (AMO). This study conducted a comprehensive investigation carbon isotopes dissolved inorganic (DIC), CO2, CH4, alongside Fe isotopes, microbial communities, functions quaternary aquifers central Yangtze River plain. The found that concentrations tended increase Fe(II) concentrations, δ56Fe, δ13C-DIC, suggesting accumulation due reductive dissolution positive correlations pmoA gene abundance versus δ13C–CH4 δ13C–CH4, prevalent presence Candidatus_Methanoperedens, jointly demonstrated potential significance Fe(III)-mediated AMO process (Fe-AMO) traditional methanogenesis. concentration value, abundance, suggested Fe-AMO facilitated groundwater. Redundancy analysis confirmed this assertion, identifying as primary determinant cooperative influence microorganisms such Candidatus_Methanoperedens Geobacter on enrichment. Our work provided new insights into dynamics subsurface environments.

Язык: Английский

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Degradation of phosphorus-containing natural organic matter facilitates enrichment of geogenic phosphorus in Quaternary aquifer systems: A molecular perspective

Journal of Hydrology, Год журнала: 2023, Номер 620, С. 129513 - 129513

Опубликована: Апрель 12, 2023

Язык: Английский

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