Factors affecting occurrence of Pinus thunbergii community and Ligustrum lucidum community on dredged reclaimed land in Tokyo Bay

Pinus thunbergii community and Ligustrum lucidum community were formed in the campus of school opend 24 years ago on dredged reclaimed land in Tokyo Bay. The current species, the soil nutrient and moisture about these plant communities, and the characteristics of the dominant species, such as seeds germination and the shade tolerance of seedlings were investegated. The seeds of P. thunbergii germinated in lowly soil moist and high temperature condition and the seedlings grew on high light condition. The seeds of L. lucidum germinated in highly soil moist, low temperature and dark condition and the seedlings grew on shading condition. The factors of formation these plant communities were adaptation of soil moisture, growing in the light and the temperature conditions. Pinus thunbergii community was formed in lowly moist soil and Ligustrum lucidum community was formed in highly moist soil.