文献类型：期刊文献

英文题名：Seasonal Self-Purification Process of Nutrients Entering Coastal Water from Land-Based Sources in Tieshan Bay, China: Insights from Incubation Experiments

作者：Xu, Fang[1];Zhang, Peng[1];He, Yingxian[1];Long, Huizi[1];Zhang, Jibiao[1];Lu, Dongliang[2];Ren, Chaoxing[3]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm, Zhanjiang 524088, Peoples R China;[2]Beibu Gulf Univ, Guangxi Key Lab Marine Environm Change & Disaster, Qinzhou 535011, Peoples R China;[3]Marine Environm Monitoring Ctr Guangxi, Beihai 536000, Peoples R China

年份：2025

卷号：13

期号：6

外文期刊名：JOURNAL OF MARINE SCIENCE AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001517049900001)、、EI(收录号：20252618679592)、Scopus(收录号：2-s2.0-105009094884)、WOS

基金：This research was supported by the Guangxi Key Research and Development Program (GuiKeAB22035065), the Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf, Beibu Gulf University (2022KF005), the Guangdong Basic and Applied Basic Research Foundation (2023A1515012769), Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004), New Era Graduate Course Ideological and Political Education Construction Project (202523).

语种：英文

外文关键词：land-based sources; self-purification process; chl-a; key control factors

外文摘要：Nutrients function as essential biological substrates for coastal phytoplankton growth and serve as pivotal indicators in marine environmental monitoring. The intensification of land-based nutrient sources inputs has exacerbated eutrophication in Chinese coastal water, while mechanistic understanding of differential self-purification processes among distinct land-based source nutrients (river source, domestic source, aquaculture source, and industrial source) remains limited, constraining accurate assessment of bay's self-purification capacity. This study conducted incubation experiments in Tieshan Bay (TSB) during Summer (June 2023) and winter (January 2024), systematically analyzing the self-purification process of nutrients and associated environmental drivers. Distinct source-specific patterns emerged: river inputs exhibited maximal dissolved inorganic nitrogen (DIN) 1.390 +/- 0.74 mg/L, whereas industrial discharges showed peak dissolved inorganic phosphorus (DIP) 4.88 +/- 1.45 mg/L. Chlorophyll a (Chl-a) concentrations varied markedly across sources, ranging from 34.97 +/- 23.37 mu g/L (domestic source) to 86.63 +/- 77.08 mu g/L (river source). First-order kinetics demonstrated significant source differentiation (p < 0.05). River-derived DIN exhibited the highest attenuation coefficient (-0.3244 +/- 0.17 d(-1)), contrasting with industrial-sourced DIP showing maximum depletion (-0.4332 +/- 0.20 d(-1)). Correlation analysis indicated that summer was significantly associated with the impacts of three key control factors pH, dissolved oxygen, and turbidity on nutrient dynamics (p < 0.05), whereas winter exhibited a stronger dependence on salinity. These parameters collectively may modulate microbial degradation pathways and particulate matter adsorption capacities. These findings establish quantitative thresholds for coastal nutrient buffering mechanisms, highlighting the necessity for source-specific eutrophication mitigation frameworks. The differential self-purification efficiencies underscore the importance of calibrating pollution control strategies according to both anthropogenic discharge characteristics and regional hydrochemical resilience, which is of key importance for ensuring the traceability and control of land-based sources of pollution into the sea and the scientific utilization of the self-purification capacity of the bay water body.