Abstract
Typha angustifolia, sometimes utilized to clarify water, were cut in June, July and August for investigating the effect of different cutting season. The cutting effects were evaluated quantitatively by regrowth characteristics of aboveground organ just after cutting and belowground biomass in winter. After cutting, the initial regrowth speed of the T. angustifolia was 2.5 times higher than the growth speed in spring season of the species. The belowground biomass in winter affected by summer cutting was 1-1.5 times higher than that in initial growing season (spring). However, it had decreased greatly about 60-80% compared with no cutting area at the same time. Therefore, the cutting in summer was found effective for controlling their expansion. Moreover, the regrowth-model analysis indicate; 1) Nutrient condition influences more the regrowth of T. angustifolia by earlier cutting treatment, 2) During June to August, June-cutting is the most effective to maintain their stands at low density.
