Full
Outline
In September 2023, a study was conducted in the Northeastern South China Sea to investigate the concentration distribution and mole composition of total dissolved amino acids (TDAA) in the seawater, as well as the sources and degradation status of dissolved organic matter (DOM). The results showed that the concentration of TDAA ranged from 0.37 to 2.59μmol/L, with an average value of (0.78±0.41) μmol/L. The horizontal distribution of TDAA exhibited a pattern of higher concentrations near the coast and lower concentrations in offshore, while the vertical distribution showed a gradual decrease from the surface to the bottom layer. Using D-alanine (D-Ala) as a biomarker, the contribution of bacterial organic matter to DOM (Bacterial-C%) was quantified. The Bacterial-C% in seawater ranged from 9.6% to 46.2%, with an average value of (23.3±8.1)%, demonstrating an overall trend of lower values near the coast and higher values in offshore areas. Additionally, the mean value of degradation index (DI) in surface seawater was (0.5 ± 1.0), while the average DI values for middle and bottom layers were (-1.2±0.6) and (-1.3±0.6), respectively. This indicates that the DOM in surface seawater was less degraded compared to those in the middle and bottom layers. This study elucidates the sources and degradation status of DOM in the Northeastern South China Sea, providing important scientific insights and data support for a deeper understanding of biogeochemical cycling processes in marginal seas.
75
22
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
