Source-specific insights into photochemical and microbial degradation of dissolved organic matter in coastal environments
文献类型：期刊论文
| 作者 | Wang, Bin3,4; Gao, Xuelu1,3,4; Thrush, Simon F.1; Liu, Yongliang2; Sun, Xiyan2,3; Zhao, Jianmin3,4; Xing, Qianguo3,4; Yang, Yuwei4 |
| 刊名 | MARINE ENVIRONMENTAL RESEARCH
 |
| 出版日期 | 2025-11-01 |
| 卷号 | 212页码:14 |
| 关键词 | Dissolved organic matter Human activities Photochemical and microbial degradation Spectral characteristics Coastal oceans |
| ISSN号 | 0141-1136 |
| DOI | 10.1016/j.marenvres.2025.107519 |
| 通讯作者 | Gao, Xuelu(xlgao@yic.ac.cn) |
| 英文摘要 | Coastal zones are critical for the biogeochemical cycling of dissolved organic matter (DOM) in marine ecosystems, yet the relative importance of photochemical and microbial degradation in DOM transformation remains poorly understood due to complex hydrodynamics, diverse sources, and human activities. Through 14-day laboratory incubations, we investigated DOM transformation mechanisms from three common marine coastal space uses: port, mariculture and inshore areas adjacent to Yantai City. DOM characterization was performed using fluorescence excitation-emission matrix parallel factor (EEM-PARAFAC) and UV-Vis spectroscopic indices. Initial characterization revealed port-area DOM exhibited mixed terrestrial-autochthonous sources; mariculture-area DOM was dominated by autochthonous signals; and inshore-area DOM showed terrestrial signatures with anthropogenic disturbance. DOM degradation dynamics varied significantly across sources: inshore-area DOM was highly photolabile, with humic-like substances degrading by 31.0 +/- 2.0 %; mariculture-area DOM preferentially underwent microbial degradation, particularly the tryptophan-like component, which degraded by similar to 50.0 %; and port-area DOM showed degradation behavior comparable to marine-dominated DOM. At the cultivation endpoint, port-area DOM demonstrated significant humification; in the mariculture area, microorganisms preferentially degraded protein-like substances, while photochemical processes facilitated the formation of humic-like compounds. Inshore-area DOM enriched with high molecular weight compounds showed significant molecular weight reduction and compositional changes, suggesting synergistic photochemical-microbial processes in DOM transformation under the influence of intensive human activities. Repeated measures ANOVA showed DOM spectral variations significantly correlated with time, system, and region (P < 0.05), indicating DOM transformation is regulated by source and chemical composition, stage-dependent degradation, and environmental drivers (natural processes and human activities). These findings demonstrate that human activities decouple natural DOM degradation processes, generating divergent carbon transformation pathways that restructure coastal biogeochemical functions. |
| WOS关键词 | AQUATIC ENVIRONMENTS ; CARBON ; FLUORESCENCE ; BIOAVAILABILITY ; CDOM ; PHYTOPLANKTON ; TERRESTRIAL ; ECOSYSTEM ; WATERS ; ISLAND |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Toxicology |
| 语种 | 英语 |
| WOS记录号 | WOS:001583371500001 |
| 资助机构 | Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences |
| 源URL | [http://ir.yic.ac.cn/handle/133337/41441]  |
| 专题 | 支撑部门_所级公共技术服务中心 |
| 通讯作者 | Gao, Xuelu |
| 作者单位 | 1.Univ Auckland, Inst Marine Sci, Auckland 1142, New Zealand 2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Muping Coastal Environm Res Stn, Yantai 264003, Shandong, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Shandong Key Lab Coastal Environm Proc, Yantai 264003, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Bin,Gao, Xuelu,Thrush, Simon F.,et al. Source-specific insights into photochemical and microbial degradation of dissolved organic matter in coastal environments[J]. MARINE ENVIRONMENTAL RESEARCH,2025,212:14. |
| APA | Wang, Bin.,Gao, Xuelu.,Thrush, Simon F..,Liu, Yongliang.,Sun, Xiyan.,...&Yang, Yuwei.(2025).Source-specific insights into photochemical and microbial degradation of dissolved organic matter in coastal environments.MARINE ENVIRONMENTAL RESEARCH,212,14. |
| MLA | Wang, Bin,et al."Source-specific insights into photochemical and microbial degradation of dissolved organic matter in coastal environments".MARINE ENVIRONMENTAL RESEARCH 212(2025):14. |
入库方式： OAI收割
来源：烟台海岸带研究所
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