砂州上の植物群落立地の物理環境特性とこれを利用した群落分布の予測

抄録

ABSTRACT: A detailed meshed vegetation map is presented based on the results of a full vegetation survey performed on a sand-bar formed in a downstream reach of the Yoshino River, Shikoku, Japan. The physical condition at each mesh element, for a period of 12 years prior to the time of the vegetation survey, is represented by a set of five hydrogeomorphic parameters calculated from geomorphic and hydrologic data. Each plant community is not disntictly characterized by community-specific averages of the parameters but rather by using histograms drawn with regard to all mesh elements in that community. Referring to the concept of PHABSIM (Physical Habitat Simulation System) developed for ecological estimation of riparian fish habitats, the histograms of each parameter are taken to be the preference curves for existing plants. A simple method to predict community distribution using the preference curves is proposed, and an example of its application is described. It is shown that this method is useful for rough prediction, however it should be refined for practical use.