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ISSN : 2287-8327

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Vol.31 No.3
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Phenological Studies of Deciduous Trees in the Cool Temperate Region of Japan

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2008, v.31 no.3, pp.193-200
Kato, Jun (Iwamurada High School, Saku)
Ichiroku Hayashi (Sugadaira Montane Research Center Tsuku)
Kato,, J. , & Ichiroku, H. (2008). Phenological Studies of Deciduous Trees in the Cool Temperate Region of Japan. Journal of Ecology and Environment, 31(3), 193-200.
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Abstract

We obtained quantitative information on leaf unfolding and leaf shedding by observing 45 species of cool temperate deciduous trees in an arboretum over 5 growing seasons. These trees were in leaf (the foliage period) for 207 days on average after 1 April; 50% of leaves had been shed by 192 days after 1 April. Duration from the start of leaf unfolding to 50% leaf shedding was 157 days on average. Leaf unfolding began 35 days on average after 1 April. For leaf unfolding to begin, a 51℃․day of cumulated daily mean air temperature above 5℃ from 1 January (modified Kira's warmth index) was needed. Fifty-nine days elapsed between initiation and the final stage of leaf unfolding. The period of net photosynthetic assimilation was 157 days. The species with succeeding- type leaf unfolding associated with the anemochore seed type dominated the early stage of succession, while the species with flush-type leaf unfolding tended to dominate the late stage of succession. Few species were found in regions where late frosts occur after the day when the cumulative temperature for leaf unfolding is achieved. Biological characteristics include time of leaf unfolding, which affects the life history of each species, so that each species occupies its own niche in the stand. We conclude that that leaf phenology, such as timing of leaf unfolding and leaf shedding, is one of the components of each species' ecological characteristics.

keywords
Deciduous trees, Leaf shedding, Leaf unfolding, Life history, Plant succession

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