FIELD EXAMINATION ON REED GROWTH, HARVEST AND REGENERATION FOR NUTRIENT REMOVAL

A wetland where aquatic macrophytes grow is expected to have the funct ion of water purification. Nutrients assimilated by them are removed f rom the water by harvesting those plants. In order to carry out harves ting to remove nutrients effectively, it is essential to know the life cycle behavior of the plants. In this study, the characteristics of r eed growth and regrowth after harvest were examined in the actual fiel d. The height and number of the shoots, the standing biomass and nutri ent contents were observed. The average height of living shoots reache d its maximum when total sunshine duration was 500 hours since harvest . Nutrient contents showed the maximum value in the early growth stage . On the basis of these results, the numerical simulation model about the life cycle of the aboveground part of reed was developed to invest igate nutrient removal efficiency by various harvest methods. It was r ecommended to harvest twice a year for the effective nutrient removal. (C) 1998 Published by Elsevier Science Ltd. All lights reserved