Ecophysiological study for adaptation to environment in adult trees of Fagus crenata and Fagus japonica
2007
Uemura. A.(Forestry and Forest Products Research Inst., Sapporo (Japan). Hokkaido Research Center)
We investigated ecophysiological properties of two Fagus species, F. crenata Blume and F. japonica Maxim., growing naturally in Japan. A scaffolding tower enabled us to measure leaf properties at the crown level of mature trees (approximately 14 m height above the ground). In the uppermost crown layer, leaf thickness of F. japonica tree was 65% of that in F. crenata tree. There were no large differences between both Fagus trees in nitrogen and chlorophyll content per unit leaf mass. However, nitrogen and chlorophyll content per unit leaf area were lower in F. japonica tree than in F. crenata tree, because F. japonica tree had thinner leaves (i.e. higher specific leaf area) than did F. crenata tree. In August (mid-growing season), daily maximum net photosynthetic rate (Pnsup(max)) and daily maximum water vapor stomatal conductance (gssup(max)) in sunlit leaves of F. japonica tree were 61% and 50%, respectively, of rates in F. crenata leaves.
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