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Limnology

, Volume 13, Issue 1, pp 149–154 | Cite as

Dissolved oxygen concentration in river sediment of the Lake Biwa tributaries, Japan

  • Yoshihiro YamadaEmail author
  • Yugo Mito
  • Akitake Igeta
  • Eitaro Wada
Note

Abstract

The dissolved oxygen concentration in the sediment pore water downstream of rivers in the Lake Biwa basin was measured, and the factors affecting the dissolved oxygen concentration were analyzed. In August 2003, nine rivers (Sakai, Nakanoi, Hebisuna, Anziki, Yasu, Echi, Ane, Oh, and Ohura) were surveyed. The dissolved oxygen was depleted in the sediment pore water of the rivers with a high proportion of particles less than 250 μm in size. For these rivers, the difference between the dissolved oxygen concentrations of the river surface water and the pore water was large, ranging from −9.54 to −5.26 mg L−1. It was found that the proportion of land turned to paddy fields has an effect on the percentage of the particles below 250 μm (standard partial regression coefficient = 0.807, p = 0.023). These results suggest that, in the Lake Biwa basin, the sedimentation of the fine particles released from paddy fields results in poor dissolved oxygen in the river sediment downstream. In addition, the water flow conditions in small- and medium-scale rivers without headwaters also affect the sedimentation of suspended particles.

Keywords

Dissolved oxygen Lake Biwa Paddy field River Sediment 

Notes

Acknowledgments

This study was part of the Multi-Disciplinary Research for Understanding Interactions between Humans and Nature in the Lake Biwa-Yodo River Watershed project at the Research Institute for Humanity and Nature.

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Copyright information

© The Japanese Society of Limnology 2011

Authors and Affiliations

  • Yoshihiro Yamada
    • 1
    Email author
  • Yugo Mito
    • 2
    • 3
  • Akitake Igeta
    • 4
  • Eitaro Wada
    • 5
  1. 1.Faculty of AgricultureKagawa UniversityKitaJapan
  2. 2.The United Graduate School of Agricultural SciencesEhime UniversityKitaJapan
  3. 3.Department of Environmental TechnologyFukken CorporationHigashiJapan
  4. 4.Research Institute for Humanity and NatureKyotoJapan
  5. 5.Research Institute for Global ChangeJapan Agency for Marine-Earth Science and TechnologyYokohamaJapan

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