Resistances to Carbon Dioxide Transfer in Leaves of <i>Cryptomeria japonica</i> in Winter, and Influences of Soil Temperature on Them

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  • 冬季におけるスギ葉のガス拡散抵抗と生育地温の影響
  • Resistances to Carbon Dioxide Transfer in Leaves of Cryptomeria joponica in Winter, and Influences of Soil Temperature on Them
  • 冬季におけるスギ葉のガス拡散抵抗と生育地温の影響〔英文〕
  • トウキ ニ オケル スギ ヨウ ノ ガス カクサン テイコウ ト セイイク チ

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The winter depression of photosynthesis in leaves of Cryptomeria japonica was studied in relation to the diffusive resistance to CO2 transfer, and the influence of soil temperature on the depression was examined. (1) The light intensity curves suggest the interference with both the photochemical process and the biochemical process of photosynthesis in winter. (2) The winter depression of photosynthesis is mainly due to the inhibition of stomatal openings and the low permeability of leaf cuticule to CO2 (an increase of leaf resistance) as well as the depression of CO2 transport in mesophyll (an increase of mesophyll resistance). (3) The low soil temperature in winter is fairly concerned with the increases of leaf resistance and mesophyll resistance and the changes in water relation of leaves. The winter depression of photosynthesis seems to have close contacts with the low soil temperature through its effect on some physiological processes such as water balance and translocation in trees.

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