2025 Volume 81 Issue 16 Article ID: 24-16025
In this study, we examined whether or not agricultural reservoirs remaining in satoyama near cities are suitable as CO₂ sinks from the viewpoint of CO₂ absorption characteristics of the reservoirs by using field surveys and numerical simulations. The results of the field survey indicated that the target reservoirsufficient nutrients necessary for the growth of waterweeds. The ΔDIC, which indicates the degree of photosynthetic activity, showed a large difference in trend between July and October (stratified) based on the relationship between chl.a. Also, The results showed that the target reservoir had sufficient nutrients necessary for the growth of waterweeds. In addition, to understand the carbon dynamics, we verified the validity of the numerical calculations and performed numerical calculations of dissolved inorganic carbon (DIC). The results showed that photosynthesis by algae is active under mild climatic conditions and that CO₂ is absorbed.
