CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 510301, China.
CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Mar Pollut Bull. 2019 Dec;149:110540. doi: 10.1016/j.marpolbul.2019.110540. Epub 2019 Aug 27.
Nutrient concentrations in porewater and their benthic fluxes were investigated in Daya Bay, South China, to study the accumulation and transfer of nutrients at sediment-water interface, as well as the impact of human activities on nutrients. The contributions of sediment to nutrients in water column and the potential influences on eutrophication were also discussed. Nutrients in porewater and overlying water changed in different seasons and areas, which was mainly attributed to human activities, hydrodynamic force and biogeochemical conditions. Mean concentrations of DIN (dissolved inorganic nitrogen), PO and SiO were 70 ± 61, 3.1 ± 4.3, 103 ± 105 μmol/L, and 234 ± 166, 15.6 ± 4.0, 353 ± 48 μmol/L in overlying water and porewater, respectively. Annual mean DIN, PO and SiO fluxes were 330 ± 249, -1.3 ± 16 and 549 ± 301 μmol/(md), respectively, indicating that sediment was generally the source of DIN and SiO, but was the sink of PO. The mean exchange capacities were (7.8 ± 5.5) × 10, (-1.2 ± 34.0) × 10 and (1.2 ± 0.6) × 10 mol/a for DIN, PO and SiO, respectively, in Daya Bay.
在中国南方的大亚湾，研究了孔隙水的营养浓度及其向底栖的通量，以研究营养物质在沉积物-水界面的积累和迁移，以及人类活动对营养物质的影响。还讨论了沉积物对水柱中营养物质的贡献以及对富营养化的潜在影响。孔隙水和上覆水中的营养物质在不同季节和区域发生变化，这主要归因于人类活动、水动力和生物地球化学条件。上覆水中 DIN（溶解无机氮）、PO 和 SiO 的平均浓度分别为 70 ± 61、3.1 ± 4.3 和 103 ± 105 μmol/L，孔隙水中的平均浓度分别为 234 ± 166、15.6 ± 4.0 和 353 ± 48 μmol/L。年平均 DIN、PO 和 SiO 的通量分别为 330 ± 249、-1.3 ± 16 和 549 ± 301 μmol/（md），这表明沉积物通常是 DIN 和 SiO 的来源，但 PO 的汇。大亚湾的 DIN、PO 和 SiO 的平均交换容量分别为（7.8 ± 5.5）×10、（-1.2 ± 34.0）×10 和（1.2 ± 0.6）×10 mol/a。
