Abstract
Recently, much attention has been drawn on experimental analysis of production potential and nutrient composition of the emergent macrophyte, Phragmites. But very few has attempted to analysis the phenomena using numerical simulation models. A dynamic growth model has been developed with the objective to simulate the seasonal variation of above and below ground biomass of Phragmites and it has been extended to simulate the nutrient composition of above ground organs. Basically, this model comprised of two sub models, biomassub and model nutrient sub model to simulate seasonal variation of biomass and nutrients. Given the initial rhizome biomass prier to growth commencement together with total global radiation (μE/m2/d) and daily mean air temperature (0C) for the intended simulation period, the model allows a reliable evaluation of production potential and mineral nutrient composition. This paper will discuss two applications made for seasonal variation of nutrient composition of Phragmites.
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