Scirpus planiculmis dominated in Nakdong river estuary is known as food for birds visiting to Nakdong river estuary and plays
an important role in material cycle and food web, while repeating growth and production, decomposition process in 1-year
interval. Therefore, if it is able to predict effectively biomass or tuber production of Scirpus planiculmis which is food source
for estuarine organisms or birds, it can provide very useful information on the Nakdong river estuary management. In this
study, regression equation that can predict the tuber production, food for birds, was obtained using initial density of Scirpus
planiculmis that can minimize the disturbance of ecosystem and is faster and easier. The correlation analysis results show that
density, biomass and tuber production have liner relationship(p<0.001) with 0.6103∼0.9950 of correlation coefficients. In
addition, the regression equations have high coefficients of determination of 0.3696∼0.7145 and it shows that it is able to
predict biomass or tuber production while using the estimated regression equation obtained from relationship among the initial
density, biomass and tuber production. The results of this study are expected to utilize effectively the management of estuary
ecosystem such as management on food source for migratory birds visiting to Nakdong river estuary.