Sedimentary phosphorus form distribution and cycling in the littoral subzones of a eutrophic lake

Journal Article (Journal Article)

Algae which bloom in open water and accumulate in the littoral zones may affect the biogeochemical cycle of phosphorus in eutrophic lakes. To determine such effects, a part of the lakeshore with little allochthonous nutrient input in Taihu Lake, China was selected for this field study. Distinct differences in sedimentary P forms were found among the different littoral subzones. The surface sedimentary total phosphorus (TP) content was 655 mg/kg in the eulittoral subzone and 631 to 641 mg/kg in the infralittoral subzone. Both were much higher than that in the profundal zone (410 mg/kg). Calcium-bound P (Ca-P) was significantly correlated to exchangeable P (Ex-P), and they both had the highest contents in the infralittoral subzone and the lowest in the profundal zone. The aluminum- and iron-bound P (Al-P, Fe-P) contents decreased from land to water along the ecotone section. Lower Fe/P ratios and higher Al-P/Fe-P ratios appeared in the infralittoral subzone, as compared with the profundal zone. This suggested that the accumulated algae could lead to a great deposit of P in the littoral zones. However, the active sedimentary P form transformation in the littoral zones would also result in a partial release of the accumulated P to the overlying water. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Full Text

Duke Authors

Cited Authors

  • Liu, H; Yin, C; Wang, H; Wang, W; Shan, B

Published Date

  • January 1, 2008

Published In

Volume / Issue

  • 36 / 1

Start / End Page

  • 78 - 83

International Standard Serial Number (ISSN)

  • 1863-0650

Digital Object Identifier (DOI)

  • 10.1002/clen.200700058

Citation Source

  • Scopus