The benthic fluxes of nutrients and the potential influences of sediment on the eutrophication in Daya Bay, South China.

Abstract:

: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), PO4 and SiO3 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, PO4 and SiO3 fluxes were 330 ± 249, -1.3 ± 16 and 549 ± 301 μmol/(m2d), respectively, indicating that sediment was generally the source of DIN and SiO3, but was the sink of PO4. The mean exchange capacities were (7.8 ± 5.5) × 107, (-1.2 ± 34.0) × 105 and (1.2 ± 0.6) × 108 mol/a for DIN, PO4 and SiO3, respectively, in Daya Bay.

journal_name

Mar Pollut Bull

authors

Zhang L,Xiong L,Zhang J,Jiang Z,Zhao C,Wu Y,Liu S,Huang X

doi

10.1016/j.marpolbul.2019.110540

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

110540

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(19)30684-8

journal_volume

149

pub_type

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