THE MANAGEMENT OF RIVERBANK MAINTAINS THE DUNE PLANT POPULATION, AN ENDANGERED SPECIES, FIMBRISTYLIS SERICEA

Abstract

The habitat of riverbank dune nurses several endangered species. Why did this area maintaine
endangered species despite of invasion of alien species? Then growth of an endangered species (Fimbristylis
sericea) and an alien species (Diodia teres) was studied in a greenhouse experiment in which the species were
grown alone or together and the resultant effects of shoot and root competition were assessed. In the alone
growth experiment, the survival rates of the both species were same. In the shoot competition experiment, the
D. teres reduced growth rate of F. sericea. In the root competition experiment, the F. sericea reduced growth
rate of D. teres. In the total competition, F. sericea were superior to D. teres. From the experiments, F. sericea
was more competitive than D. teres under the waterless same habitat. D. teres was more competitive than F.
sericea under the waterrich condition. The habitat of riverbank dune is always affected strong wind, than the
disturbance of sand moving. When D. teres is grown up, the sand moving prevented growth of D. teres. In the
long term, the vegetation succession will reduce the disturbance frequency and will be occurred the extinction
of endangered species.