Manabu Fujii Lab, Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology


物質循環を基礎とした健全で持続可能な流域環境の創出 / Creation of healthy and sustainable water environment based on elemental cycles



Water bodies around the world, including the oceans, coastal areas, lakes and rivers, are expected to sustainably function as places to nurture rich marine resources and provide high-quality water resources through sound management and conservation of ecosystems and water quality. In the United Nations Sustainable Development Goals (SDGs), sustainable water use (Goal 6), management and conservation of marine and fishery resources (Goal 14), ecosystem conservation, assurance of ecosystem services, and sustainable land use (Goal 15) are also considered to be important issues, and creation of healthy and sustainable water environment considering the elemental cycles in watershed. has been recognized as a priority for human society.

Nutrients such as nitrogen and phosphorus have long been used as major indicators for water quality (pollution) and ecosystem management in watersheds. However, in order to understand the dynamics of aquatic ecosystems and primary productivity, it is also important to clarify the biogeochemical functions of the essential metals (e.g., mechanisms of metal uptake and growth by primary producers such as algae). In this theme, we have analyzed and systematized various chemical reactions of the essential trace metals at the elementary reaction level, and constructed a kinetic model that can explain the uptake of these metals by primary producers (see figure). In addition, we are proposing to apply the reaction kinetic model to the Sanriku coastline, where iron shortages have long been considered to be associated with the Isoyake (i.e., the burning of the rocky shore), to propose watershed land use and coastal environmental conservation after the Great East Japan Earthquake. Through these research projects, we are providing the knowledge necessary for the permanent conservation of socially valuable coastal areas in the future. In addition, since the environmental contamination of radionuclides following the Fukushima nuclear power plant accident and the water environment problems caused by micro-pollutants are regarded as important social issues, the developed reaction models and advanced knowledge on water chemistry are being utilized for such environmental impact assessment as well as the development of energy-producing wastewater treatment technologies.

参考文献 / References

  • Natsuike, M., Endo, Y., Ito, H., Miyamoto, M., Yoshimura, C., Fujii, M., Iron uptake kinetics by coastal micro and macro algae in relation to riverine and coastal organic matters, Estuarine, Coastal and Shelf Science, Elsevier, Vol 235, 106580, 2020.
  • 科研費基盤研究(B) 2019-21年度「分子レベル有機錯体解析に基づく流域での溶存鉄の起源・輸送機構解明」(研究代表)、科研費基盤研究(B) 2017-19年度「モリブデンの環境動態に着目した毒性藍藻類の窒素固定特性と異常増殖メカニズムの解明」(研究代表)

東京工業大学 環境・社会理工学院 土木・環境工学系 藤井 学 研究室 〒152-8552 東京都目黒区大岡山2-12-1-M1-22 / TEL: 03-5734-3687 / E-mail: fujii.m.ah(at)
Manabu Fujii Lab, Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1-M1-22, Ookayama, Meguro-ku, Tokyo 152-8552, Japan / TEL: +81-3-5734-3687 / E-mail: fujii.m.ah(at)