Internal loading regulates the phosphorus concentration in a diversion input shallow lake in the semi-humid region of North China: Differentiated processes in littoral wetland and open water areas

Water Research, Journal Year: 2024, Volume and Issue: 257, P. 121680 - 121680

Published: April 26, 2024

Language: Английский

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Chronic increasing nitrogen and endogenous phosphorus release from sediment threaten to the water quality in a semi-humid region reservoir

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 931, P. 172924 - 172924

Published: April 30, 2024

Language: Английский

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Identifying the spatio-seasonal pattern of hydrochemical evolution and surface water-groundwater interaction in a large urban river basin, Northwest China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 944, P. 173989 - 173989

Published: June 13, 2024

Language: Английский

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Linking Antibiotic Residues and Antibiotic Resistance Genes to Water Quality Parameters in Urban Reservoirs: A Seasonal Perspective

Environments, Journal Year: 2025, Volume and Issue: 12(3), P. 96 - 96

Published: March 18, 2025

The interaction between antibiotics and antibiotic resistance genes (ARGs) in freshwater ecosystems has become a critical environmental concern. This study investigates seasonal variations of sulfonamide tetracycline their relationship with ARGs three urban reservoirs Nanjing, China: Pingshan Forest Park, Shanhu Lake Wetland Zhaoqiao Reservoir. Sampling was conducted May September 2023 to assess water quality, concentrations, ARG abundance. A total 30 samples were analyzed regard physicochemical parameters, heavy metals, antibiotics. quantitative PCR assay used measure the abundance relative 16S rRNA gene. Sulfonamide concentrations ranged from 120 ng/L, while tetracyclines 50–160 ng/L. Notably, sulfamethazine decreased significantly two (Shanhu Zhaoqiao, p < 0.05), other showed minimal variation, indicating persistent contamination agricultural runoff wastewater discharge. lower than September, being cumulatively genes. Strong correlations (r > 0.7) observed parameters like dissolved oxygen pH. High levels areas without nearby hospitals or pharmaceutical companies, implicating agriculture as major pollution source. By analyzing across eutrophic China, we highlight drivers proliferation propose targeted mitigation strategies.

Language: Английский

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Evaluation of the water quality of a high Andean lake using different quantitative approaches

Ecological Indicators, Journal Year: 2023, Volume and Issue: 154, P. 110924 - 110924

Published: Sept. 8, 2023

This study assessed a high Andean lake's trophic state and water quality using methodologies with eutrophication indexes. Water samples were collected at six points in the lake, monthly frequency, for three winter summer months. Dissolved oxygen, pH, phosphates, nitrates, transparency, chlorophyll-a, fecal coliforms, biological oxygen demand (BOD), temperature, turbidity determined each point. The of lake was categorized by applying Organization Economic Cooperation Development (OECD) index, Carlson's index (CTSI) (TRIX). In addition, National Sanitation Foundation (NSF-WQI), Canadian Quality Index (CCME-WQI) Oregon (OWQI) used to evaluate quality. Results indicated that had level eutrophication, suggesting an excessive accumulation nutrients water. CTSI TRIX showed hyper-eutrophic state, while according OECD methodology, related phosphorus transparency hypereutrophic, chlorophyll, it varied from mesotrophic eutrophic. NSF classified average quality, CCME fair OWQI as very poor. Therefore, andean indexes presented significant differences based on physicochemical characteristics. human influence identified main cause including tourism agriculture. These results suggest measures should be taken reduce activity area control pollution lake.

Language: Английский

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Unveiling the dynamic of nitrogen through migration and transformation patterns in the groundwater level fluctuation zone of a different hyporheic zone sediment

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Feb. 17, 2024

Abstract This study investigates the impact of water levels and soil texture on migration transformation nitrate (NO 3 − -N) ammonium (NH 4 + within a column. The concentrations NO -N gradually decreased from an initial concentration 34.19 ± 0.86 mg/L to 14.33 0.77 day 70, exhibiting fluctuations influenced by texture. Higher were associated with concentrations, while lower resulted in increased concentrations. retention absorption capacity for highest fine sand soil, followed medium coarse sand, highlighting significance movement retention. analysis variance (ANOVA) confirmed statistically significant variations pH, dissolve oxygen oxidation–reduction potential across columns (p < 0.05). Fluctuating -N, distinct patterns observed different textures. Water level also impacted NH higher resulting Among types considered, exhibited -N. These findings underscore roles levels, texture, type migration, transformation, nitrogen compounds columns. results contribute better understanding dynamics under varying environmental conditions, providing valuable insights into small-scale column experiments.

Language: Английский

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Microbial community dynamics in shallow-water grass-type lakes: Habitat succession of microbial ecological assembly and coexistence mechanisms

Ecotoxicology and Environmental Safety, Journal Year: 2025, Volume and Issue: 291, P. 117819 - 117819

Published: Feb. 1, 2025

Aggregation and co-occurrence patterns of microbial communities are the key scientific issues in lake ecology. To explore mechanisms ecological assembly community succession this unique habitat, 16 samples were collected from eight sites Wuliangsuhai Lake. Second-generation DNA sequencing was applied to reveal spatial dynamics bacterial structure distribution across two environmental media nutrient-rich shallow grassland elucidate characteristics network. This study also examined effects filtering biological interactions on formation maintenance composition diversity. The results highlight habitat heterogeneity composition, with no discernible latitudinal diversity patterns. causal analysis identified electrical conductivity, pH, total nitrogen, phosphorus as primary factors driving changes water sediment grass-type lakes, TN being driver. CL500-3 a pollution-tolerant species aquatic environments. g__norank_f_Verrucomicrobiaceae exhibited significant distance decay pattern, higher turnover rate than sediment. Co-occurrence network revealed greater complexity stability communities, three potential keystone species, water. neutral null model indicated that more susceptible dispersal limitation, whereas complex increased role deterministic processes construction. proposed division plant regions freshwater lakes demonstrated different types, contributing comprehensive understanding shallow-water structure.

Language: Английский

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Distribution, environmental behavior, and ecotoxicity of different metal oxide nanoparticles in the aquatic environment

Process Safety and Environmental Protection, Journal Year: 2025, Volume and Issue: unknown, P. 106856 - 106856

Published: Feb. 1, 2025

Language: Английский

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Characteristics of nitrogen and phosphorus migration at sediment-water interface in seasonal frozen lakes and the mechanism of microbial driven cycling: a case study of Lake Daihai

Journal of Contaminant Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 104598 - 104598

Published: May 1, 2025

Language: Английский

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Evolution Characteristics and Driving Factors of Cyanobacterial Blooms in Hulun Lake from 2018 to 2022

Water, Journal Year: 2023, Volume and Issue: 15(21), P. 3765 - 3765

Published: Oct. 27, 2023

Algal blooms pose serious threats to water environments and the balance of aquatic ecosystems. Moreover, environmental factors may be primary driver bloom outbreaks. Studying characteristics driving evolution cyanobacterial can provide a scientific basis for restoration lake Based on Landsat extended time series practical ecological investigation, this study determined area dominant species in Hulun Lake, analyzed their influencing factors. The results show that outbreak tended decrease from 2018 2020, with peak remaining below 150 km2; contrast, showed an increasing trend 2021–2022, maximum 1970.55 km2 June 2022. Pearson correlation analysis wind speed was main factor In 2022, there were five cyanobacteria summer three autumn. Redundancy quality indicators COD, DO, TP, WT, pH, TN summer, WT general, Lake are sensitive changes nutrient concentration. An important approach towards effectively reducing intensity coping risks associated changing environment would reduce external loads regulate ecosystem structure lake. future, while studying law outbreaks, attention should paid impact physiological status

Language: Английский

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