Abstract
We investigated water balance and water chemistry of Miyajimanuma Pool located in Ishikari Peatland of northern Japan. The surrounding area was predominated by agricultural land use. Results showed that surface water level at pool dropped down remarkably from the end of irrigation period to the beginning of non-irrigation period. This was caused by control of a floodgate. Water budget analysis indicated that amounts of inflow and outflow water through canals dominated. Pool water concentrations of dissolved total nitrogen, dissolved total phosphorus, and electric conductivity were similar to those of inflow water through canals. It was suggested that pool water chemistry was affected by the inflow water through canals. Consequently, it was considered that present hydrochemistry condition was affected by water management for agricultural-use.
