The wetlands composed of reed has attracted attention in Japan. Not only preservation of natural wetlands but also creation have come to pubilc notice. The objective of this study was to clarify the enviromental factors on fomation of natural wetland composed of reed, by investigating the reed's biomass, water quality of lake, condition of soil, water quality of soil pore water in estuarine wetland of Lake Jinzai.
The results suggested that the concentration of salinity and NH_4-N in soil pore water were mportant to make fomation natural wetland composed of reed as the environmental factors.