Journal of Water and Environment Technology
Online ISSN : 1348-2165
ISSN-L : 1348-2165
Original Paper
Effect of Nitrate on Phosphorus Mobilization from Bottom Sediment in Shallow Eutrophic Lakes
Yuichi ISHII, Tohru YABE, Masako NAKAMURA, Yoshimasa AMANO, Nobuyuki KOMATSU, Keiji WATANABE
Author information
  • Yuichi ISHII

    Water Environmental Laboratory, Ibaraki Kasumigaura Environmental Science Center
    Environmental Biology Division, National Institute for Environmental Studies

  • Tohru YABE

    Environmental Biology Division, National Institute for Environmental Studies

  • Masako NAKAMURA

    The United Graduate School of Agricultural Sciences, Tottori University

  • Yoshimasa AMANO

    Environmental Biology Division, National Institute for Environmental Studies
    Graduate School of Engineering, Chiba University

  • Nobuyuki KOMATSU

    Water Environmental Laboratory, Ibaraki Kasumigaura Environmental Science Center
    Fisheries Administration Division, Ibaraki Prefectural Government

  • Keiji WATANABE

    Water Environmental Laboratory, Ibaraki Kasumigaura Environmental Science Center

Corresponding author

ORCID
Keywords: nitrate, phosphorus release, redox potential
JOURNAL FREE ACCESS

2009 Volume 7 Issue 3 Pages 163-176

Details
  • Published: 2009 Received: January 30, 2009 Available on J-STAGE: September 28, 2009 Accepted: May 21, 2009 Advance online publication: - Revised: -
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Abstract
Seasonal variation in phosphorus release potential from bottom sediment and environmental factors affecting phosphorus mobilization in shallow eutrophic lakes, Lakes Nishiura and Kitaura in Japan, were investigated. At uplake sites, the fluxes were low and showed no seasonal variation. The Eh in the sediments at these sites was positive and in an oxidizing state, whereas sediments at other sites were in a reducing state. The oxidation/reduction states were not affected by the presence of DO in the boundary layer water. DO in the boundary layer only oxidized the surface of sediment layer and affected DIP release from the sediment. The oxidation of sediment was due to nitrate input from inflowing rivers. At mid-lake sites, where the DIP release flux was high, the Eh in sediments was increased by nitrate input. Nitrate, which is an electron acceptor in the boundary layer, diffused into the sediment and oxidized the sediment layer in contrast to the definitive oxidation attributed to DO. The DIP release flux decreased with increasing nitrate supply rates. The sediment record shows that the oxidation state was maintained by nitrate supply, which is affected by the decomposition rate of nitrate and strongly affects DIP release from lake sediments under anaerobic conditions.
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© 2009 Japan Society on Water Environment
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