ESTIMATION OF THE TOTAL CHLOROPHYLL AMOUNT AND ITS SEASONAL CHANGE IN A WARM-TEMPERATE EVERGREEN OAK FOREST AT MINAMATA, JAPAN

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  • KIRITA Hiromitsu
    Department of Biology, Faculty of Science, Osaka City University:Pressent address : Ecology Division, National Grassland Research Institute, Tochigi-ken, Japan.
  • HOZUMI Kazuo
    Department of Biology, Faculty of Science, Osaka City University

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Other Title
  • 照葉樹林の葉層にふくまれるクロロフィル量とその季節変化について
  • 照葉樹林の葉層にふくまれるクロロフィル量とその季節変化について〔英文〕
  • テリハ ジュリン ノ ヨウソウ ニ フクマレル クロロフィルリョウ ト ソノ キセツ ヘンカ ニ ツイテ エイブン

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The chlorophyll content per unit leaf area (CHL) in Castanopsis cuspidata, Quercus gilva and other evergreen trees was found to decrease and to have less pronounced seasonal change (with an early summer minimum and a winter maximum) toward the bottorn of the forest canopy. The CHL-mean relative illuminance curve proved to be approximately hyperbolic. A formula was derived to estimate the total amount of chlorophyll held by the total forest canopy (CHLF, in a land area basis), based on this regression and the exponential extinction of light with cumulative leaf area density along the canopy profile. Estimated CHLF increased from the new leaf stage in June through summer to a maximum value (ca. 40 kg/ha) in winter, and reached a minimum (ca. 20 kg/ha) in June when most of the leaves were shed. The correlation between CHLF and the rate of gross canopy photosynthesis was positive during the peripds of June-August and Novembr-March, while it turned out to be negative in March-June and August-November.

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