Dynamics of particulate phosphorus in a shallow eutrophic lake

• Published in: The Science of the total environment 2016-09, Vol.563-564, p.413-423
• Main Authors: Shinohara, Ryuichiro, Imai, Akio, Kohzu, Ayato, Tomioka, Noriko, Furusato, Eiichi, Satou, Takayuki, Sano, Tomoharu, Komatsu, Kazuhiro, Miura, Shingo, Shimotori, Koichi
• Format: Article
• Language: English
• Subjects: Biogenic P; Environmental Monitoring; Eutrophication; Freshwater; Geologic Sediments - chemistry; Japan; Lakes - chemistry; Particulate Matter - analysis; Particulate P; Phosphorus - analysis; Phosphorus Compounds - analysis; Sediment resuspension; Water Movements; Water Pollutants, Chemical - analysis
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2016.04.134

We tested the hypothesis that in shallow, eutrophic Lake Kasumigaura, the concentration of particulate phosphorus (PP) is controlled by biogenic P (P in living or dead phytoplankton and bacterial cells), rather than by resuspension of inorganic P in sediment. Increases in wind velocity and turbidity were associated with bottom shear stress exceeding the critical value for the lake (τc=0.15Nm−2); this increased turbidity was due to sediment resuspension. However, concentrations of PP; HCl-extractable, reactive P in PP (P-rP); and HCl-extractable, non-reactive P in PP (P-nrP) were not correlated with wind velocity (PP vs. wind velocity: r=0.40, p>0.05). Rather, the P-nrP concentration accounted for approximately 79% of PP, and the concentrations of PP, P-rP, and P-nrP were correlated with the particulate organic carbon (POC) concentration (POC vs. PP: r=0.90, p