Ecological Research

, Volume 10, Issue 1, pp 53–64 | Cite as

Comparative study of leaf carbon gain in saplings ofThujopsis dolabrata var.hondai andQuercus mongolica var.grosseserrata in a cool-temperate deciduous forest

  • Ryoji Hashimoto
  • Manabu Shirahata
Article

Abstract

Seasonal courses of leaf CO2 gas exchange in a growing season were examined in saplings ofThujopsis dolabrata var.hondai andQuercus mongolica var.grosseserrata in a cool temperate deciduous forest. Between the two tree species there were no large differences in the light compensation point of leaf photosynthesis, except for the season of new leaf expansion. However, light-saturated rates of net photosynthesis were obviously high inT. dolabrata var.hondai. EvergreenT. dolabrata var.hondai saplings had large photosynthetic production in two seasons, before the emergence of new foliage and after foliage fall of the overstory deciduous trees, because of the significantly high solar radiant energy penetrating under the forest canopy during the seasons. Saplings of deciduousQ. mongolica var.grosseserrata were heavily shaded throughout the growing season by foliage of the overstory trees, which resulted in a low daily surplus production. The annual surplus production of leaves in the growing season was estimated to be 2300 mmol CO2 m−2 inT. dolabrata var.hondai and −100 mmol CO2 m−2, slightly negative, inQ. mongolica var.grosseserrata. These results supported the high survivability ofT. dolabrata var.hondai saplings and the high mortality ofQ. mongolica var.grosseserrata in the deciduous forest.

Key words

leaf carbon gain light regime Quercus mongolica var.grosseserrata sapling survival Thujopsis dolabrata var.hondai 

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Copyright information

© Ecological Society of Japan 1995

Authors and Affiliations

  • Ryoji Hashimoto
    • 1
  • Manabu Shirahata
    • 1
  1. 1.Department of Agronomy and Forestry, Faculty of AgricultureIwate UniversityMoriokaJapan

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