보문 : 염습지 (鹽濕地) 환경변화에 대한 퉁퉁마디와 칠면초의 적응

Seasonal measurements of plant water status and environmental factors are made in two halophytes (Suaeda japonica and Salicornia herbacea) at the different sites such as Kunsan and Mokpo. Seasonal changes of environmental factors do not influence on the S. japonica community, but contents of soil water and chloride affect on the S. herbacea community. The seasonal changes in plant water components of S. japonica are similar to that those of S. herbacea. In both halophytes, lowering of plant water potential during the dry periods coupled with lowering of osmotic potential are observed. Since the reduction in osmotic potential roughly matched the reduction in water potential, turgor pressure is maintained through the season. With the maintenance of turgor in the field, growth and plant performance are continued. No significant differences in osmotic adjustment are observed between the two halophytes. The trends of the diurnal change in plant water potential of S. japonica is similar to those of S. herbacea, but the magnitude of change is very different. The magnitude of change is greater in S. japonica whereas that is less in S. herbacea. These studies demonstrate that there is active osmotic adjustment to salinity in S. japonica based on a lowering of osmotic potential. However there are presumably another mechanisms in addition to osmotic adjustment in S. herbacea.