Light outweighs ammonium: irradiance governs early morphological, physiological and isotopic responses of Zostera marina under controlled nutrient additions
文献类型：期刊论文
| 作者 | Xu, Shaochun1,3,4,5; Yin, Guangwei2; Wang, Xinhua3,5; Yuan, Yuan2; Wang, Yibo3,5; Liu, Mingjie3,5; Zhang, Yu1,4,5; Yue, Shidong1,4,5; Zhang, Xiaomei1,4,5; Zhou, Yi1,3,4,5 |
| 刊名 | FRONTIERS IN MARINE SCIENCE
 |
| 出版日期 | 2026-02-12 |
| 卷号 | 13页码:13 |
| 关键词 | ammonium enrichment
antioxidant defense
light limitation
photosynthesis
|
| DOI | 10.3389/fmars.2026.1752748 |
| 通讯作者 | Xu, Shaochun(xushaochun@qdio.ac.cn) ; Zhou, Yi(yizhou@qdio.ac.cn) |
| 英文摘要 | Under accelerating coastal eutrophication, disentangling the relative roles of light limitation and nitrogen enrichment is essential for diagnosing seagrass decline. We conducted a fully crossed light & times; ammonium experiment using intact Zostera marina cores from Guzhenkou Bay (4 irradiance levels: 180, 90.6, 17, 0 mu mol photons m-2 s-1; 4 NH4Cl levels: 0, 25, 50, 100 mu mol L-1; 5 weeks; 16 units; no within-cell replication). Across traits, irradiance-not NH4Cl within the tested range-governed responses at the level of dominant main effects. Shading sharply reduced shoot density, above- and below-ground biomass (AGB, BGB) and Fv/Fm, with near-complete collapse at darkness. Biomass turnover accelerated under shading (higher above-ground shedding, below-ground mass loss), and below-ground carbon content declined, together indicating a shift from carbon accrual to expenditure. By contrast, NH4Cl enrichment showed minimal main effects on morphology, pigments, Fv/Fm, or antioxidant enzymes, although tissue delta 15N decreased with NH4Cl addition, evidencing ammonium assimilation. Antioxidant responses were variable (POD increased with reduced irradiance; SOD, CAT, GSH-Px inconsistent), while MDA did not increase under shading and was occasionally higher under high light, consistent with lower photo-oxidative load at low irradiance. Leaf and rhizome delta 13C showed no significant treatment effects and only a weak, non-significant tendency toward less negative values under severe shading. Collectively, the trait suite diagnoses light-driven carbon limitation as the proximal stressor, with nitrogen effects contingent on concentration and context. We recommend tiered monitoring that couples rapid photophysiology (Fv/Fm) with structural (shoot density, AGB/BGB) and integrative biogeochemical indicators (below-ground C; delta-isotopes), and management focused on water clarity to meet species-specific light requirements. |
| WOS关键词 | NITROGEN ; SEAGRASSES ; TOXICITY ; PHOSPHORUS ; DELTA-N-15 ; STRESS ; RATIOS ; PLANTS |
| 资助项目 | National Natural Science Foundation of China |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:001699660800001 |
| 出版者 | FRONTIERS MEDIA SA |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/204829]  |
| 专题 | 海洋研究所_海洋生态与环境科学重点实验室 |
| 通讯作者 | Xu, Shaochun; Zhou, Yi |
| 作者单位 | 1.Minist Nat Resources, Field Sci Observat & Res Stn Yellow Bohai Sea, Qingdao, Peoples R China 2.Qingdao Univ Sci & Technol, Coll Environm & Safety Engn, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Qingdao Marine Sci & Technol Ctr, Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Shaochun,Yin, Guangwei,Wang, Xinhua,et al. Light outweighs ammonium: irradiance governs early morphological, physiological and isotopic responses of Zostera marina under controlled nutrient additions[J]. FRONTIERS IN MARINE SCIENCE,2026,13:13. |
| APA | Xu, Shaochun.,Yin, Guangwei.,Wang, Xinhua.,Yuan, Yuan.,Wang, Yibo.,...&Zhou, Yi.(2026).Light outweighs ammonium: irradiance governs early morphological, physiological and isotopic responses of Zostera marina under controlled nutrient additions.FRONTIERS IN MARINE SCIENCE,13,13. |
| MLA | Xu, Shaochun,et al."Light outweighs ammonium: irradiance governs early morphological, physiological and isotopic responses of Zostera marina under controlled nutrient additions".FRONTIERS IN MARINE SCIENCE 13(2026):13. |
入库方式： OAI收割
来源：海洋研究所
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