Soil properties at habitats of gramineous plants (phragmites communis, P. japonica, Phacelurus latifolius, Miscanthus sacchariflorus, M. sinensis) on Honmyo river water system in Isahaya City, Nagasaki Prefecture

摘要

Honmyo river flows through Isahaya City and empties into Ariake Sea. Seawater go up to Park dam of the main stream of the river and to Umetsu bridge of the blanch, Hanzō river. Many herbaceous plants grew on the bank or the riverbed. Especilally, perennial herbs such as Phragmites communis, P. japonica, Phacelurus latifolius Miscanthus sacchariflorus and M. sinensis, did dominantly in summer. They usually distributed separately. Their separate distribution had a great interest. We measured soil properties, soil texture, water content, pH and electric conductivity, in order to clear up the cause of their separate distribution. Their separate distribution was found to be mainly caused by soil texture. Moreover, soil water content and soil electoric also affected their distribution.