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Forestation of floodplain or sandbars follows the succession of vegetation. Thus, it enhances soil nutrients in the process, which then further accelerates the forestation. However, the nutrient process has not been elucidated yet. The nutrient budget by the colonization of riparian trees were estimated in the field observation. The allometric relations of tree biomass, separately with leaf biomass, and the kneeheight diameter were obtained. At the same time, nitrogen and phosphorus concentrations of each tree organ were analyzed. Then, the yearly enhancement of stocked nitrogen in trunks and branches was obtained from the allometric relations, and the material allocation to leaves, which is essentially exchangeable, were estimated. The allocation to leaves was nearly same as the yearly stocked amount, and its proportion in the yearly uptaken amount of nitrogen was higher with older trees rather than younger ones. The exchangeable amount was more or less that of herbaceous plants. Thus, although soil nitrogen gradually increases with the succession to larger biomass species while they are herbaceous, it does not change much once it is forested.

CHANGE OF NUTRIENT BUDGETS BY THE SUCCESSION TO TREES IN THE FLOODPLAIN FORESTATION AND ITS POSSIBILITY OF ACCELERATING FORESTATION