Risk Assessment of nutrient flux caused by decrease of paddy field using hydrological model coupled with socioeconomic model

2016 Fiscal Year Final Research Report

• Project/Area Number: 26870837
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental agriculture(including landscape science); Environmental impact assessment
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Shimizu Yuta 国立研究開発法人農業・食品産業技術総合研究機構, 西日本農業研究センター・生産環境研究領域, 契約研究員 (50625829)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: マルチエージェントモデル / 水文流出モデル / 土地利用変化 / 耕作放棄 / 栄養塩 / 流域

Outline of Final Research Achievements

The objective of this research was to assess the risk of changes in nutrient flux at a watershed scale due to decrease of paddy field caused by abandonment. A result of decline of paddy filed indicated increase of maximum runoff, sediment yield, particulate nitrogen flux, and phosphorus flux. Former condition of abandoned field could affect the increasing magnitude of both water yield and material fluxes; wet type field was greater than dry type field and a field on steep slope was greater than flat. Increasing abandoned field is unavoidable for the near future based on the trend of estimated land-use changing patterns. Therefore, it is important to prevent further abandon of cultivated paddy field, especially for hilly mountainous regions.

Free Research Field

水文学