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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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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Coupled Processes Involving Organic Matter and Fe Oxyhydroxides Control Geogenic Phosphorus Enrichment in Groundwater Systems: New Evidence from FT-ICR-MS and XANES

Environmental Science & Technology, Год журнала: 2023, Номер 57(45), С. 17427 - 17438

Опубликована: Сен. 12, 2023

The enrichment of geogenic phosphorus (P) in groundwater systems threatens environmental and public health worldwide. Two significant factors affecting P include organic matter (OM) Fe (oxyhydr)oxide (FeOOH). However, due to variable reactivities OM FeOOH, strategies their coupled influence controlling remain elusive. This research reveals that when the depositional environment is enriched more labile aliphatic OM, its fermentation with reductive dissolution both amorphous crystalline FeOOHs. When recalcitrant aromatic it largely relies on FeOOH acting concurrently as electron acceptors while serving "conduits" help itself stimulate degradation methanogenesis. main source by these two different processes different: former P-containing which mainly contained unsaturated compounds highly unsaturated-low O compounds, latter associated FeOOH. In addition, geological setting affects deposition rate sediments, can alter degradation/preservation, subsequently geochemical conditions occurrence. These findings provide new evidence perspectives for understanding hydro(bio)geochemical alluvial-lacustrine aquifer systems.

Язык: Английский

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