Chemical fraction of organic nitrogen in paddy fields and its decomposition process and dynamics

• Project/Area Number: 24780231
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Irrigation, drainage and rural engineering/Rural planning
• Research Institution: Kumamoto University (2013-2014); Kyoto University (2012)
• Principal Investigator: HAMA Takehide 熊本大学, 自然科学研究科, 准教授 (30512008)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 有機態窒素 / 水田 / 排水路 / 底泥

Outline of Final Research Achievements

There are few researches on decomposition and transport of nitrogen of the sediment in drainage canals. The objective of this study is to clarify the nitrogen dynamics in paddy fields. In particular, this study focused on organic-state nitrogen, which is the main pool of nitrogen in paddy soil and canal sediments, and clarify the characteristics of decomposition and release. Nitrogen dynamics were clarified by investigation in the field and experiments in the laboratory. Three study sites were located around Lake Biwa. It was concluded that the canal sediments in the paddy fields had high concentration of nitrogen and the decomposition and release of organic nitrogen could determine the nitrogen concentration in the drainage water during non-rainy days.

Research Products

• [Journal Article] Nitrogen release from sediments in agricultural drainage canal (2015)
  • Author(s): Jikumaru, C., Hama, T., Nagai, T., Iwasaki, D., Kawagoshi, Y.
  • Journal Title: Journal of Water and Environment Technology Volume: 13 Pages: 99-105
  • NAID: 130005063548
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Assessment of phosphorus buffering capacity of drainage canal sediments in paddy-field districts (2015)
  • Author(s): Hama, T., Iwasaki, D., Jikumaru, C., Kawagoshi, Y., Nagai, T.
  • Journal Title: Journal of Water and Environment Technology Volume: 13 Pages: 63-75
  • NAID: 130004933702
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Characteristics of decomposition of nitrogen and carbon in the sediments in agricultural drainage canals (2014)
  • Author(s): Nagai, T. Hama, T., Sugiyama, S., Iwasaki, D., Igarash, F., Kawashima, S.
  • Journal Title: Journal of Water and Environmental Technology Volume: 12 Pages: 151-160
  • NAID: 130003391649
  • Peer Reviewed
• [Journal Article] Effects of water temperature on phosphate adsorption onto sediments in an agricultural drainage canal in a paddy-field district (2013)
  • Author(s): Sugiyama, S. and Hama, T.
  • Journal Title: Ecological Engineering Volume: 61 Pages: 94-99
  • Peer Reviewed
• [Journal Article] Reducing the phosphorus effluent load from a paddy-field district through cyclic irrigation (2013)
  • Author(s): Hama T., Aoki T., Osuga K., Sugiyama, S., Iwasaki, D.
  • Journal Title: Ecological Engineering Volume: 54 Pages: 107-115
  • NAID: 120005323024
  • Peer Reviewed
• [Presentation] 熊本県の黒ボク水田における稲作期の窒素の流出特性 (2015)
  • Author(s): 軸丸智菜美，濱 武英，小林拓仁，西川義紀，山根嘉彦，川越保徳
  • Organizer: 日本水環境学会
  • Place of Presentation: 金沢大学
  • Year and Date: 2015-03-15 – 2015-03-17
• [Presentation] 水田地区の排水路底泥に含まれる有機態窒素の無機化の特徴 (2015)
  • Author(s): 五十嵐文典
  • Organizer: 水環境学会年会
  • Place of Presentation: 大阪工業大学
• [Presentation] 琵琶湖周辺の水田地区排水路の底泥に含まれる炭素の空間把握 (2015)
  • Author(s): 永井智久
  • Organizer: 水環境学会年会
  • Place of Presentation: 大阪工業大学
• [Presentation] Role of organic nitrogen and carbon in canal sediments on draiange water in paddy fields (2014)
  • Author(s): Hama, T., Jikumaru, C., Nagai, T., Kawagoshi, Y., Iwasaki, D.
  • Organizer: 9th IWE international symposium on waste management problems in agro-industries
  • Place of Presentation: 高知
  • Year and Date: 2014-11-24 – 2014-11-26
• [Presentation] Decomposition characteristics of dissolved organic matter in paddy fields (2014)
  • Author(s): Jikumaru, C., Hama, T., Kawagoshi, Y.
  • Organizer: 9th IWE international symposium on waste management problems in agro-industries
  • Place of Presentation: 高知
  • Year and Date: 2014-11-24 – 2014-11-26
• [Presentation] 水田土壌の有機態窒素の分解特性の解明 (2014)
  • Author(s): 軸丸智菜美，濱 武英，川越保徳
  • Organizer: 土木学会西部支部研究発表会
  • Place of Presentation: 福岡大学
• [Presentation] Phosphorus Release from the Sediments of Drainage Canals in Paddy-Field Districts around Lake Biwa (2013)
  • Author(s): Iwasaki, D., Hama, T., Sugiyama, S., Nagai, T., Igarashi, F., Kawashima, S.
  • Organizer: Water and Environemnt Technology 2013
  • Place of Presentation: Tokyo University of Agriculture and Technology
• [Presentation] Characteristics of Decomposition of Nitrogen and Carbon in the Sediments in Agricultural Drainage Canals (2013)
  • Author(s): Nagai, T., Hama, T., Sugiyama, S., Iwasaki, D., Igarashi, F.
  • Organizer: Water and Environemnt Technology 2013
  • Place of Presentation: Tokyo University of Agriculture and Technology
• [Presentation] The effect of bioturbation by tubificid worms on nutrient release from the sediment in an agricultural drainage canal (2013)
  • Author(s): Hama, T. Iwasaki, D., Nagai, T., Igarashi, F.
  • Organizer: Water and Environemnt Technology 2013
  • Place of Presentation: Tokyo University of Agriculture and Technology
• [Presentation] Decomposition Characteristics of Organic Nitrogen of Flooded Field Soil (2013)
  • Author(s): Jikumaru, C., Hama, T., Fukunaga, S., Miyasaki, Y., Kawagoshi, Y.
  • Organizer: ICAST 2013 Kumamoto
  • Place of Presentation: Kumamoto University