Photosynthesis and Biomass Allocation of Beech (Fagus crenata) and Dwarf-bamboo (Sasa kurilensis) in Response to Contrasting Light Regimes in a Japan Sea-type Beech Forest :

NDLデジタルコレクション 被引用文献5件 参考文献25件
  • Kobayashi,Tsuyoshi
    Laboratory of Ecology, Department of Environmental Sciences, Faculty of Science, Ibaraki University:(Present address)Japan Science and Technology Corporation, The Center for Forest Decline Studies
  • Muraoka,Hiroyuki
    Institute of Biological Sciences, University of Tsukuba:(Present address)Institute for Basin Ecosystem Studies, Gifu University
  • Shimano,Koji
    Department of Vegetation Ecotechnology, Institute of Environmental Science and Technology, Yokohama National University

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Regeneration of beech (Fagus crenata) forests depends on the formation of canopy gaps. However, in Japan Sea-type beech forests, a dwarf bamboo (Sasa kurilensis) conspicuously occupies sunny gaps. Therefore, F. crenata seedlings must escape the severe interference of S. kurilensis in the gaps and persist beneath a closed canopy of the beech forest. We hypothesized that the growth of F. crenata seedlings in the understory would be favored by their being more plastic than S. kurilensis in photosynthetic and morphological traits, which would support the matter production of F. crenata seedlings in a wide range of light availabilities. To examine this hypothesis, the photosynthetic-light response of individual leaves and the biomass allocation in aboveground parts (i. e., the culm/foliage ratio) were surveyed at sites with contrasting light availabilities in a Japan Sea-type beech forest in central Japan. In F. crenata, photosynthetic light utilization efficiency at relatively low light was greater, and the dark respiration rate was smaller in the leaves of seedlings (10 cm in height) beneath the closed canopy than in the leaves of saplings at the sunny forest edge. The culm/foliage (C/F) ratio of the F. crenata seedlings at the shady site was small, suggesting effective matter-production beneath the beech canopy. On the other hand, S. kurilensis both in the gap and beneath the beech canopy showed low plasticity in photosynthesis and the culm/foliage ratio. Because the shoot density of S. kurilensis was smaller beneath the beech canopy than in the gap, the light availability at the bottom of the S. kurilensis layer was greater beneath the beech canopy. These results suggest that the photosynthetic productivity of the F. crenata seedlings would be enough for the seedlings to survive in the understory with a low density of S. kurilensis shoots beneath the closed beech canopy.

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