大型湿地植生の洪水によるダメージと回復過程を考慮した適正洪水導入規模に関する研究<論文>

概要

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Field experiment was conducted for elucidating the damage effect on the productivity of wetland species, Phragmites australis, and upland species, Miscanthus sacchariflorus, in a river-floodplain. River flow was analyzed by two-dimensional depth-averaged Reynolds equation to solve the moment acting on the stems. Regrowth dynamic model considering their stem-breaking was formulated and their growth was analyzed in relation to flood discharge, flood interval and their stem-breaking moment. If their stem breaking is occurred every year, survival of the two species is difficult. However, they can survive with 2-5 years’ interval and the superiority of M. sacchariflorus is decreased with stem-breaking condition. However, the breaking moment of M. sacchariflorus was larger than that of P. australis and the decrement in belowground biomass was smaller under bending damage. This indicates that the weak flood does not change their competitive superiority.