野辺山高原におけるサクラソウ湿生群落の構造と植物遷移に関する研究

概要

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The present study was conducted to clarify hydrarch community structure on the Nobeyama Plateau and characterize plant succession characteristics over a period of three years. The aim of the study was to develop plant conservation strategies for habitats that support the threatened Primula sieboldii communities. The results of TWINSPAN analysis showed that the study area contained four community types and that identified species could be classified into five species groups. Two community types contained valuable species group that have Primula sieboldii and Viola hirtipes. Sasa nipponica, a species characteristic of dry environments, and Phamnus davurica var. nipponica, a species characteristic of Phamno nipponicae-Alnetumjaponicae ass. nov., increased, and the degree of succession increased particularly well defined in these two communities. In general, while an increase in succession decreases the levels of Therophytes (Th) and Helophytes and Hydrophytes (HH), the degree of the decrease in Th and HH wasnt marked; this observation appears to be a characteristic feature of succession in this community. Although the rate of succession in this community was low relative to other mesic communities, given the marked increase in shrubs over a short period of time, any vegetation management strategy may need employ mowing to remove potential competitors.