著者

渡辺 隆一 大久保 明紀子 井田 秀行

出版者

信州大学

雑誌

信州大学教育学部附属志賀自然教育研究施設研究業績 (ISSN:03899128)

巻号頁・発行日

vol.43, pp.13-16, 2006-03-25

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The leaf phenology of Betula ermanii was observed in Shiga Heights, central Japan from 1985 to 2004. During this period, 5 birches were selected and their phenological traits analyzed using succes- sive automatic daily photography. The annual variation of mean temperature at this monitor station, specifically over the last 10 years, has become increasingly warm. According to observable facts, these birches have gradually tended to accelerate the time of leaf flushing and delay the time of leaf coloring. This process is indispensable in clarifying the effects of global warming on ecosystems while continuing similar monitoring in/for the future.