伊豆沼における湖内植生消長の観測と解析

抄録

 Lake Izunuma is a shallow eutrophic lake located in the northern part of Miyagi Prefecture. Lotus (Nelumbo nucifera) is the dominant species of the lacustrine vegetation, which has possibilities of accelerating the eutrophication through decomposition of the accumulated litter. In this study, field observations were conducted to understand annual cycle of nutrients (nitrogen, phosphorus, carbon) with regard to growth and mortality of lotus community. We modeled biomass dynamics of lotus based on the observations. Moreover, the nutrients load into the lake from dead body of lotus is considerably smaller than the inflow load. From this result, it is considered influence of the dead body on the water quality is small.