Photosynthetic Production in Abies veitchii Advance Growths Growing under Different LightEnvironmental Conditions (II) Photosynthesis and Respiration

Abstract

S（林内），I（林縁），O（皆伐跡天然更新地）区に生育するシラベ前生稚樹の光合成・呼吸速度を調べた。測定は切り枝について人工条件下で，1979年の全生長期間にわたって行なった。光合成・呼吸速度と照度・気温の関係には，生育場所，枝葉齢，季節による違いがみられた。当年生枝葉の光合成能力はS区5.8，I区5.5，O区3.2mgCO2・gd. w.-1・hr-1（8月30日）と暗い区ほど大きかった。CO2 exchanges in shoots detached from Abies veitchii LINDL. advance growths were compared among the shaded plot (Plot S) under the deep canopy of the subalpine natural forest, the intermediate plot (Plot I) near the forest border, and the open plot (Plot O) on a cut-over area where clear-cutting had been made with expectation of natural regeneration in 1970. The measurements were made under the controlled light and temperature conditions throughout a growing season of 1979