The species composition and habitat condition of the alpine desert (Dicentro-Stellarietea nipponicae Ohba 1969) on the northern part of the Ushiro-tateyama mountain range were investigated. Based on species composition, the Dicentro-Stellarietea nipponicae vegetation in this region was classified into 6 associations, 2 communities, and 2 subassociations.
On the leeward slope, Saxifragetum merckii idsuroei, Cardaminetum nipponicae and the Polygonum nakaii community are established on rectilinear to concave slopes, Veronico-Polygonetum weyrichii is established on rectilinear to convex slopes, and the Draba shiroumana community is established on convex slopes. Sedo rosei-Saxifragetum bronchialis funstonii, Dicentro-Violetum crassae are established on the convex slope on the windward side. Cerastio-Minuartietum vernae japonicae is established on the convex slope on any aspect. Most of the vegetation units were found on gravels, Sedo rosei-Saxifragetum bronchialis funstonii and the Draba shiroumana community were mainly found on rock shelves. The Polygonum nakaii community and Cerastio-Minuartietum vernae japonicae were found in serpentine areas. The Draba shiroumana community was found in limestone areas.
In this region, the presence of Saxifrago-Cardaminetalia nipponicae could be explained by slope aspect and slope type. Alliances and vegetation units depended on more specifically defined environments, such as the stability of surface gravels and soil chemistry in the serpentine and limestone areas for the Minuartietalia vernae japonicae of this region
View full abstract