XVI International Botanical Congess

Annual productivity of halophytes under salt stress was determined to compare with other phytomass besides our studies on the mechanism of salt tolerance in Salicornia europaea L., and other species of halophytes which were growing around Salicornia colonies. The biomass of halophytes was determined by the vegetation map and population density of Salicornia europaea L., Glaux maritima L., Spergularia marina L., Triglochin maritimum L., and Atriplex gmelini L. in the salt marsh around Lake Notoro-ko in the eastern region of Hokkaido, Japan. The annual phytomass productiones by dry weight (t/ha/y) were 0.36-2. 12 for Salicornia, 0.38-8.16 for Glaux, 0.53-2.55 for Spergularia, 0.53-50.2 for Triglochin and 13.6 for Atriplex. Each of them is low level productivity to compare with others, but in the real case of sociation, the productivity under the stress at salt marsh may be proposed as a level of temperate grassland.