抄録
This study was conducted to make clear the groundwater environment and the influences to the vegetation of forest land under the subway construction. The former was investigated by using the distributions of water table and. the cross sections. The latter was investigated by using the daily fluctuations of soil moisture tension in the planting site of higher trees and the observations of growth along the subway construction. Consequently, the groundwater environment was not influenced so much by the shield tunnel-ing of the subway construction, but much influenced by the excavation works. Because the excavation works are considered to cause the sudden change of groundwater environment. On the other hand, the sudden change of ground water influences to the soil moisture environment of the vegetation, so it is found that much higher dead trees and higher weakened trees were observed along the route of the excavation works.
