Effect of Bioturbation by Tubificid Worms on Nutrient Release from the Sediment in an Agricultural Drainage Canal

• HAMA Takehide

  Graduate School of Science and Technology, Kumamoto University, Japan

• IWASAKI Daichi

  Ministry of Agriculture, Forestry and Fisheries, Japan

• NAGAI Tomohisa

  Graduate School of Agriculture, Kyoto University, Japan

• IGARASHI Fuminori

  Ministry of Agriculture, Forestry and Fisheries, Japan

• KAWAGOSHI Yasunori

  Graduate School of Science and Technology, Kumamoto University, Japan

• OZAKI Hiromi

  Graduate School of Agriculture, Kyoto University, Japan

Abstract

Nutrient effluent load from paddy fields has a large impact on water quality in the downstream areas. The sediment in drainage canals can act as nutrient source by releasing nutrients to the overlying drainage water. In this study, we evaluated the effect of bioturbation caused by tubificid worms, which live commonly in paddy fields, on nutrient release from the sediment in drainage canals. We investigated a low-lying paddy field district adjacent to Lake Biwa. We also sampled drainage water and the sediment in the study site and conducted incubation experiment of the sediment for four weeks. In the sediment incubation experiment, we added different densities of tubificid worms to the sediment. The effect of tubificid worms on nitrogen release was much larger than that on phosphorus. Nitrogen was mainly released as ammonium nitrogen by the excretion of tubificid worms.

Journal

• Journal of Water and Environment Technology

  Journal of Water and Environment Technology 12 (3), 295-305, 2014

  Japan Society on Water Environment

Keywords

• nitrogen
• paddy field
• phosphorus
• tubificid worm

Details

• CRID: 1390001205180143744
• NII Article ID: 130004438762
• DOI: 10.2965/jwet.2014.295
• ISSN: 13482165
• Web Site: https://www.jstage.jst.go.jp/article/jwet/12/3/12_295/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed