Nutrient dynamics and their interaction with phytoplankton growth during autumn in Liaodong Bay, China

摘要: Abstract Discharges of domestic sewage, industrial wastewater, and runoff agricultural fertilizer have caused severe nutrient pollution eutrophication in many estuaries coastal areas around the world, especially Bohai Sea China its inner bay, Liaodong Bay. Subsequent to studies this bay during summer 2013, an investigation was conducted autumn (dry season) better understand interactive effects light, temperature, concentrations on phytoplankton growth bay. Analyses long-term data showed that dissolved inorganic nitrogen had increased roughly sixfold eightfold since 1980s as a result use, from wastewater loss wetlands their water purification service. In contrast, phosphate silicate decreased by factors 2 5, respectively, past half century because anthropogenic reductions sediment loads (e.g., construction check dams reservoirs large-scale vegetation restoration projects). We found no evidence limited or phosphorus. Plots nitrate versus salinity indicated conservative mixing both cases. Analogous plots ammonium revealed net uptake input, respectively. Phytoplankton likely accounted for ammonium, desorption phosphorus suspended particulate matter input phosphate. The major controlling study were light availability temperature. Nearly all incoming photosynthetically active radiation attenuated column, less than 1% energy absorbed phytoplankton. Comparisons with previous work Bay similar case contrasting regions world general pattern regional maxima biomass (or even harmful algal blooms) changes community structure associated temperature variations presence growth-rate-saturating concentrations.