Nitrous Oxide Emissions at Aquaculture Ponds in the coastal zone of the Bohai Rim Region of China: Impacts of eutrophication and feeding practice

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 125959 - 125959

Опубликована: Март 1, 2025

Язык: Английский

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Changes of Nitrous Oxide Dynamics Induced by Typhoons: A Case in Zhanjiang Bay, China

Journal of Geophysical Research Biogeosciences, Год журнала: 2025, Номер 130(3)

Опубликована: Март 1, 2025

Abstract Under the influence of global climate change, both frequency and intensity typhoons are increasing. This study examines impact typhoon on nitrous oxide (N 2 O) dynamics in coastal bays, which most active areas N O production ocean. Employing 15 stable isotope labeling technique, coupled with mass spectrometry analysis key biogeochemical parameters, we conducted a series five continuous cruises before (one cruise) after Chaba (four cruises) Zhanjiang Bay, semiclosed bay northern South China Sea. Our results showed that landfall led to sharp decrease concentration Bay. However, also triggered substantial water column sedimentary environments, therefore facilitating rapid recovery levels within short period. In column, typhoon‐induced enhancement situ could be attributed input nutrients terrestrial particles, creates an anaerobic or hypoxic microenvironment conducive production. Concurrently, sediment, deposition particles derived from phytoplankton blooms introduces large amount fresh particulate organic matter, further promoting findings suggest efficient nitrogen removal process, has been previously underestimated. By elucidating aspects cycle bays during typhoons, this research aids shaping policies mitigate greenhouse gas emissions by typhoons.

Язык: Английский

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Dynamics Complexity Induced by Salinity in a Stochastic Phytoplankton–Zooplankton Model Under Acid–Base Changes

Mathematical Methods in the Applied Sciences, Год журнала: 2025, Номер unknown

Опубликована: Май 6, 2025

ABSTRACT In this paper, on the basis of theories and methods ecology, a deterministic phytoplankton–zooplankton (PZ) model as well its stochastic differential equation version, which takes into account synergistic effect salinity pH, is established. A key advantage considering pH effects that it can make dynamic behaviors PZ models more realistic, fundamentally different from current related researches. The main purpose paper to explore how affect growth dynamics phytoplankton in disturbance environments. For model, we existence possible equilibrium points, local global stability, Hopf bifurcation. study properties persistence mean, extinction, unique ergodic stationary distribution. addition, critical point often overlooked most studies. Ecologically, via numerical simulations, find have great influence It worth emphasizing increase downstream destabilize dynamics, while decrease able stabilize dynamics. Additionally, revealed an or upstream not conducive zooplankton, but trigger occurrence blooms when value middle range. These results provide new insights understanding complexity models.

Язык: Английский

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Joint impact of global warming and Allee effect on the phytoplankton–zooplankton dynamics under the mean-reverting Ornstein–Uhlenbeck process

The European Physical Journal Plus, Год журнала: 2025, Номер 140(5)

Опубликована: Май 21, 2025

Язык: Английский

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Seasonal isotopic and isotopomeric signatures of nitrous oxide produced microbially in a eutrophic estuary

Marine Pollution Bulletin, Год журнала: 2024, Номер 204, С. 116528 - 116528

Опубликована: Июнь 3, 2024

Anthropogenic input of excess nutrients stimulates massive nitrous oxide (N2O) production in estuaries with distinct seasonal variations. Here, nitrogen isotopic and isotopomeric signatures were utilized to investigate the dynamics N2O nitrification at middle reach eutrophic Pearl River Estuary south China. Elevated primarily via ammonia oxidation (> 1 nM-N d−1) occurred from April November, along increased temperature decreased dissolved oxygen concentration. This consistently oxygenated water column showed active denitrification, contributing 20–40 % production. The microbial generally constituted a minor fraction (10–15 %) estuarine water-air interface efflux, suggesting that upstream transport tidal dilution regulated inventory estuary. Nitrification (up 3000 played critical role bioavailable conversion production, albeit yields below 0.05 %.

Язык: Английский

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Water residence time controls seasonal nitrous oxide budget in a semi-enclosed bay: Insights from an improvement estimation method

Marine Pollution Bulletin, Год журнала: 2024, Номер 206, С. 116701 - 116701

Опубликована: Июль 10, 2024

Язык: Английский

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