Abstract
A symphytosociological study for composition and structural analysis of green patches occurring in urban areas of Yokosuka, Kanagawa Prefecture was done using the unified methods of sigmassociation and mesh mapping. For classifying vegetation landscapes, we tried a new method in that a traditional vegetation-landscape analysis based on sigmassociation releves and an analysis by means of mesh mapping were united. Urban green areas in the study site were classified into various levels of vegetational landscape units by using the new method. As a result, the urban landscape region was classified into the Bryo-Sagino geosigmataxon. Moreover, the landscape region of green patches occurring on hill slopes was divided into the landscape unit of the RuboAralio=Daphno-Querco geosigmataxon. A division map of vegetational landscape in the study site was drawn using legends of the geosigmataxa that were integrated into the hyper geosigmataxa. An evaluation map of synthetic vegetational landscape in the study site was made using legends from these hyper geosigmataxa. The above-mentioned geosigmataxa and hyper geosigmataxa were analyzed by means of statistical procedure using numerical data and ecological features of those essential landscape units and these discussed in terms of spatial structures and functional relationships. The spatial structure of the vegetational landscapes in the investigation region were distributed over the sub-systems including green patches on hill slopes in a matrix of urban landscape.
