Changes in the understory flora following Sika deer browsing with special reference to flowering stage in Makura-dani, Ashiu Exeperimental Forest

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  • 芦生研究林枕谷におけるシカ摂食にともなう林床開花植物相の変化
  • アシウ ケンキュウリンマクラダニ ニ オケル シカ セッショク ニ トモナウ リンショウ カイカ ショクブツソウ ノ ヘンカ

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Abstract

Changes in the flora and the individual number of flowering plants under Sika deer browsing were investigated at Makura-dani in Ashiu Experimental Forest, Kyoto Prefecture, Japan. The number of species decreased from 84 to 56. Among the 77 species evaluated, eight species increased and 47 species decreased conspiciously in number, probably resulting in the local extinction of 22 species. The rate of species loss was greater for large-sized plants and the rate of unchanged or less changed species was greater for small-sized plants. Summer or autumn flowering herbaceous species showed higher rates of decreased species number than spring flowering species. Therefore, plant size and flowering season were the important characteristics for evaluating the browsing effect. The estimated number of flowering individuals and the Simpson's diversity index showed distinctly different phenological patterns after Shika deer browsing, and the seasonal function of flowering plant community on herbivorous insects visiting flowers were supposed to have changed.

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