Research theme for competitive and other funds (1)：
The environmental assessment in waters ecosystem using the stable isotope ratios. The production of the global warming gas in the dam lake ecosystem. The nitrogen Cycle in the river mouth tideland ecosystem.
TOKUMASU Minoru, YAMADA Yoshihiro, TAKASE Keiji, NAKANO Takanori. The influence of the fault on Sajio Plain, Ehime Prefecture on groundwater level in the plain based on long- term observation data. 2019. 61. 3. 183-196