| Shi Huaming,Ma Yu,Li Xulu,Shi Xiaoyong,Zhang Junxiao. 2019. Distribution, residence time, autotrophic production, and heterotrophic removal of DOP in the Mirs Bay, northern South China Sea. Acta Oceanologica Sinica, 38(8):17－26 |
| Distribution, residence time, autotrophic production, and heterotrophic removal of DOP in the Mirs Bay, northern South China Sea |
| 南海北部大鹏湾中DOP的分布、滞留时间、自养生产和异养降解 |
| Received:April 25, 2018 |
| DOI：10.1007/s13131-019-1384-8 |
| Key words:dissolved organic phosphorus temporal and spatial distributions residence time autotrophic production heterotrophic removal Mirs Bay northern South China Sea |
| 中文关键词: 溶解有机磷 时空分布 滞留时间 自养生产 异养降解 大鹏湾 南海北部 |
| 基金项目:The National Key Basic Research Special Foundation of China under contract No. 2013CB965101; the Marine Science and Technology Foundation of the South China Sea Sub-administration, SOA, China under contract No. 1624. |
| Author Name | Affiliation | E-mail | | Shi Huaming | College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
South China Sea Marine Survey and Technology Center, Ministry of Natural Resources, Guangzhou 510300, China | | | Ma Yu | South China Sea Marine Survey and Technology Center, Ministry of Natural Resources, Guangzhou 510300, China | | | Li Xulu | South China Sea Marine Survey and Technology Center, Ministry of Natural Resources, Guangzhou 510300, China | benlixulu@sohu.com | | Shi Xiaoyong | College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
National Marine Hazard Mitigation Service, Ministry of Natural Resources, Beijing 100194, China | | | Zhang Junxiao | South China Sea Marine Survey and Technology Center, Ministry of Natural Resources, Guangzhou 510300, China | |
|
| Hits: 1291 |
| Download times: 909 |
| Abstract: |
| The importance of dissolved organic phosphorus (DOP) as a potential nutrient source for primary producers in marine systems has been recognized for up to eight decades, but currently, the understanding of the biogeochemistry of DOP is in its infancy. In the present study, monthly data between 2000 and 2014 were used to analyze the temporal and spatial distributions of DOP in the Mir Bay, the northern South China Sea. The DOP residence time (TDOP) was also investigated using a simple regression analysis in combination with chlorophyll a (Chl a) measurements while excess DOP (ΔDOP), produced by the biogeochemical processes of autotrophic production and heterotrophic removal, was determined using a two-component mixing mass-balance model in combination with salinity measurements. The results showed that the DOP concentration was (0.017±0.010) mg/L higher in the surface-water compared with the bottom-water and higher in the inner Tolo Harbour and waters adjacent to Shatoujiao compared with the main zone of the bay. Although seasonal changes and annual variability in the DOP were small, the surface DOP concentration was higher in the wet season (April-September) than in the dry season (October-March) due to the impacts of seaward discharges and atmospheric deposition into the bay. Measurement and regression results showed that the DOP release rate from phytoplankton production was about 1.83 (g P)/(g Chl a) and the TDOP was about 7 d, which implied that the DOP cycle in the bay was rapid. The ΔDOP was calculated from the model to be about 0.000 mg/L in the main zone of the bay and about 0.002 mg/L in the inner Tolo Harbour and waters adjacent to Shaotoujiao, suggesting that the autotrophic production of DOP was almost balanced by the heterotrophic removal in the main zone of the bay and dominated in the inner Tolo Harbour and waters adjacent to Shaotoujiao. In conclusion, the Mirs Bay is very productive and fairly heterotrophic. |
| 中文摘要: |
| 八十多年来，海洋体系中溶解有机磷（DOP）作为初级生产者潜在营养源的重要性就已被认识，但至今对DOP生物地球化学仅有初级的了解。本文中利用2000~2014年每月的调查数据，分析南海北部大鹏湾中DOP的时空分布。结合叶绿素a（Chl a）测量数据，利用简单回归分析，探讨DOP滞留时间（TDOP）。结合盐度（S）测量数据，利用二维混合质量平衡模式确定自养生产和异养降解生物地球化学过程产生的余量DOP（ΔDOP）。湾中DOP质量浓度为0.017±0.010 mg/L，表层高于底层，吐露港内和沙头角邻近水域高于湾主区。虽然DOP的季节变化和年变化不大，但由于向海排放和大气沉降，湿季（4~9月）湾中表层DOP质量浓度高于干季（10月~翌年3月）。测量和回归分析结果表明，浮游植物生产的DOP释放速率约为1.83 （g P）/（g Chl a），而TDOP约为7 d，暗示湾中DOP被快速循环。模式计算得到的ΔDOP在湾主区约为0.000 mg/L， 而在吐露港内和沙头角邻近水域约为0.010mg/L，说明湾主区中DOP的自养生产几乎被异养降解平衡，而在吐露港内和沙头角邻近水域中自养生产占主导地位。由此得出结论，大鹏湾具有高的自养生产力和相当的异养降解力。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
