A dose-dependent "benefit-cost" window of ammonium enrichment in eelgrass (Zostera marina) under non-limiting light: insights from morphology, physiology and stable isotopes
文献类型：期刊论文
| 作者 | Xu, Shaochun1,2,3,4; Li, Xiaoyu1,2,3; Zhou, Yi1,2,3,4 |
| 刊名 | ESTUARINE COASTAL AND SHELF SCIENCE
 |
| 出版日期 | 2026-07-01 |
| 卷号 | 334页码:10 |
| 关键词 | Zostera marina Ammonium enrichment Eutrophication Carbon-nitrogen coupling Photosynthesis Antioxidant enzymes Stable isotopes |
| ISSN号 | 0272-7714 |
| DOI | 10.1016/j.ecss.2026.109809 |
| 通讯作者 | Xu, Shaochun(xushaochun@qdio.ac.cn) |
| 英文摘要 | Ammonium (NH4+) enrichment is a pervasive feature of coastal eutrophication, yet its direct effects on seagrass physiology are often confounded by concurrent light limitation. Using intact eelgrass (Zostera marina)-sediment cores, we tested dose-dependent responses to water-column NH4+ enrichment under constant, non-limiting irradiance. Cores were exposed for five weeks to 0, 25, 50 and 100 mu mol L-1 NH4+ at 180 mu mol photons m-2 s-1, and morphological, physiological, biochemical, elemental and stable-isotope traits were quantified. Low NH4+ enrichment stimulated leaf expansion and increased aboveground and belowground biomass without altering shoot density, consistent with short-term relief of nitrogen limitation. Moderate NH4+ maximized Rubisco activity, pigment concentrations and antioxidant enzyme activities, indicating enhanced photosynthetic capacity and protective metabolism. In contrast, the highest NH4+ level maintained high PSII potential efficiency (Fv/Fm) and elevated tissue nitrogen, but reduced Rubisco, pigments and antioxidant defenses, suggesting increasing physiological costs under over-enrichment. Both tissues accumulated nitrogen and showed declining C:N (carbon-to-nitrogen ratio), with disproportionately strong belowground enrichment. delta 15N (nitrogen stable isotope composition) declined consistently, confirming progressive incorporation of added NH4+, while delta 13C (carbon stable isotope composition) enrichment-especially belowground-suggested altered carbon acquisition and/or allocation. Overall, eelgrass exhibited a clear "benefit-cost" window to NH4+ under constant light, highlighting nutrient-driven restructuring of coupled C-N physiology beyond simple light-mediated effects. |
| WOS关键词 | NITROGEN ; BIOMARKERS ; SEAGRASSES ; TOXICITY ; NUTRIENT |
| 资助项目 | Young Scientists Fund of the National Natural Science Foundation of China[42206142] ; Taishan Scholars Program (Distinguished Taishan Scholars) |
| WOS研究方向 | Marine & Freshwater Biology ; Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:001714393700001 |
| 出版者 | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/205124]  |
| 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 |
| 作者单位 | 1.Qingdao Marine Sci & Technol Ctr, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Lab Marine Ecol & Environm Sci, Qingdao 266000, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Minist Nat Resources, Field Sci Observat & Res Stn Yellow Bohai Sea Temp, Qingdao 266033, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Shaochun,Li, Xiaoyu,Zhou, Yi. A dose-dependent "benefit-cost" window of ammonium enrichment in eelgrass (Zostera marina) under non-limiting light: insights from morphology, physiology and stable isotopes[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2026,334:10. |
| APA | Xu, Shaochun,Li, Xiaoyu,&Zhou, Yi.(2026).A dose-dependent "benefit-cost" window of ammonium enrichment in eelgrass (Zostera marina) under non-limiting light: insights from morphology, physiology and stable isotopes.ESTUARINE COASTAL AND SHELF SCIENCE,334,10. |
| MLA | Xu, Shaochun,et al."A dose-dependent "benefit-cost" window of ammonium enrichment in eelgrass (Zostera marina) under non-limiting light: insights from morphology, physiology and stable isotopes".ESTUARINE COASTAL AND SHELF SCIENCE 334(2026):10. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。