Estimation of spatial scale where paddy soils act as system for nutrient dynamics and assessment of its buffering capacity

• Project/Area Number: 15H05631
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Rural environmental engineering/Planning
• Research Institution: Kumamoto University
• Principal Investigator: Hama Takehide 熊本大学, くまもと水循環・減災研究教育センター, 准教授 (30512008)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000); Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2015: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
• Keywords: 水田土壌 / 窒素 / リン / 黒ボク土壌 / 黒ボク / 水田 / 物質エネルギー循環・管理 / 黒ボク土

Outline of Final Research Achievements

In this research, the effect of hydraulic retention time on nutrient concentrations of effluent water from a soil column was evaluated. The change of nutrient concentrations in the effluent water decreased by the increase of the infiltration rate. In particular, phosphorus concentration in the soil column tended to become homogeneous by the increase of the infiltration rate. Phosphorus concentration in the effluent water was lower when phosphorus was supplied to the soil column by the slower the infiltration rate. However, the amount of phosphorus absorbed by the soil increased with the infiltration rate. It is confirmed that the nutrient buffering capacity of soils depends on the supply rate of nutrient.

Research Products

• [Journal Article] High growth potential and nitrogen removal performance of marine anammox bacteria in shrimp-aquaculture sediment (2018)
  • Author(s): Duc, L. V., Song, B., Ito, H., Hama, T., Otani, M., Kawagoshi, Y.
  • Journal Title: Chemosphere Volume: 196 Pages: 69-77
  • Peer Reviewed
• [Journal Article] 水稲生産における農業水利施設の寄与 (2017)
  • Author(s): 濱 武英，甲斐聡史，永田 稔
  • Journal Title: 農業農村工学会誌 Volume: 85 Pages: 37-40
  • NAID: 130007968182
  • Peer Reviewed / Open Access
• [Journal Article] Role of organic nitrogen and carbon in canal sediments on drainage water in paddy fields (2016)
  • Author(s): Hama, T., Nagai, T., Jikumaru, C., Kawagoshi, Y., and Iwasaki, D.
  • Journal Title: Journal of Water and Environment Technology Volume: 14 Pages: 211-217
  • NAID: 130005259682
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] 熊本白川中流域水田の地下水涵養と窒素除去の可能性 (2015)
  • Author(s): 濱 武英，軸丸智菜美，小林拓仁，川越保徳，島 武男，藤見俊夫
  • Journal Title: 農業農村工学会論文集 Volume: 299 Pages: 89-93
  • NAID: 220000164921
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 地下浸透に伴う農地土壌中のリン動態の解明 (2018)
  • Author(s): 弓岡大亮、濱 武英、北村耕一朗、今藤賢也、川越保徳
  • Organizer: 日本水環境学会
• [Presentation] 白川中流域水田の窒素除去能力の解明 (2017)
  • Author(s): 大津里香保，濱 武英，今藤賢也，桑原悟，川越保徳
  • Organizer: 第51回日本水環境学会年会
  • Place of Presentation: 熊本大学
• [Presentation] Cmparative study on water and nutrient mass balance of paddy fields in the northern Aso caldera (2016)
  • Author(s): Hama, T., Jikumaru, C., Kawagoshi, Y., Ito, H.
  • Organizer: Water and Environment Technology 2016
  • Place of Presentation: Chuo University
  • Int'l Joint Research