Estimating dynamics of fern species richness and assemblages for 30 years in Japan capital and along planning belt of linear motor car from Tokyo to Nagoya

We surveyed species density of ferns in Musashi Tokyo and Saitama Prefs around capital of Japan and planning belt of Linea express of km from Tokyo to Nagoya during considering with records years mainly The species richness species richness per km X km and similarity of species assemblages represented by species overlap were recorded and calculated between them of the past and present Recent species richness is about half or less and the similarity ranged in Musashi and in the similarity along the Linea express planning belt a nbsp nbsp nbsp nbsp nbsp nbsp The species richness is much decreased in Musashi and the Linea express planning belt in the temperate in southern Honshu b nbsp nbsp nbsp nbsp nbsp nbsp The similarity of species assemblages ranged for years The fern flora might be affected by the human activity than the climatic warming in the temperate region of Japan