Diatom-based dissolved inorganic nitrogen reconstruction in the Changjiang River estuary and its adjacent areas
文献类型：CNKI期刊论文
| 作者 | Xin FAN; Fangjin CHENG; Zhiming YU ; Xiuxian SONG
|
| 发表日期 | 2023-07-15 |
| 出处 | Journal of Oceanology and Limnology
 |
| 关键词 | Changjiang River estuary dissolved inorganic nitrogen(DIN) reconstruction diatoms transfer function |
| 英文摘要 | A five-component weighted average partial least squares(WA-PLS) calibration model was developed by analysing diatom assemblages in 34 surface sediment samples(collected in 2015) from the Changjiang River estuary(CRE) and its adjacent areas to infer dissolved inorganic nitrogen (DIN)concentrations. Eighteen additional sets of surface sediment diatoms and corresponding upper water DIN data(collected in 2012) were used to evaluate the accuracy of the model, and the relationship between observed and diatom-inferred DIN(DI-DIN) values(R2=0.85) illustrated the strong performance of the transfer function, indicating that precise reconstructions of former DIN are possible. The diatom-DIN transfer function was applied to the diatom record from a sediment core DH8-2(1962-2012) collected in the Fujian-Zhejiang area south of the CRE. The reconstruction based on the DI-DIN model showed a significant DIN increase from 1962–2012, reflecting the influence of human activities on the very large increase in eutrophication. Three distinct periods can be seen from the changes in DIN and diatom taxa. In the 1962–1972 period, the DIN content was relatively low, with an average of 5.94 μmol/L, and more than 80% of the diatom species identified were benthic taxa. In the 1972–2004 period, as the impact of human activities intensified, large nutrient inputs caused the DIN content to increase, with an average of 8.25 μmol/L. The nutrient inputs also caused a significant change in the nutrient components and a distinct increase in small planktonic taxa. In the 2004–2012 period, the DIN content continued to rise,fluctuating at approximately 10 μmol/L. A continuous increase in the frequency of planktonic taxa(up to 65.48%) indicated that eutrophication was further intensified, which was confirmed by the transformation from diatom-induced red tide to dinoflagellate-induced red tide during this period. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the Taishan Scholars Climbing Program of Shandong Province of 2019, the National Natural Science Foundation of China (No. 41806091) ; the National Natural Science Foundation of China (No. 41506142) ; the PhD Start-up Fund of Shandong Jiaotong University (Nos. BS201902055, BS201902051) |
| 卷 | v.41期:04页:246-262 |
| 语种 | 英文; |
| 分类号 | X52 |
| ISSN号 | 2096-5508 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187067]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.CollegeofNavalArchitectureandPortEngineering,ShandongJiaotongUniversity 2.CASKeyLaboratoryofMarineEcologyandEnvironmentalSciences,InstituteofOceanology,ChineseAcademyofSciences 3.LaboratoryofMarineEcologyandEnvironmentalScience,PilotNationalLaboratoryforMarineScienceandTechnology(Qingdao) 4.EnvironmentalMonitoringCenterofQingdao 5.UniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Xin FAN,Fangjin CHENG,Zhiming YU,et al. Diatom-based dissolved inorganic nitrogen reconstruction in the Changjiang River estuary and its adjacent areas. 2023. |
入库方式： OAI收割
来源：海洋研究所
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