Spatial and Seasonal Variations in Photosynthetic Properties within a Beech (Fagus crenata Blume) Crown

スポンサーリンク

概要

• 論文の詳細を見る

• The light response curve and the intercellular CO_2 concentration response curve of CO_2 assimilation rate were investigated together with the light conditions at the four different heights within the beech crown from 1995 to 1997 on Mt. Fuji in Japan. On the seasonal fiuctuation, the CO_2 assimilation rate at light saturated condition increased rapidly in May, and attained to the maximum between the end of June and July, thereafter, slightly decreased until the middle of August and rapidly decreased in September and October. The daily sum of photosynthetic photon flux density attenuated with deeping within the crown, and particularly, the relative value on 2nd position dropped to only 30%. The A_<max> decreased from 10 to 5 μmol m^<-2> s-1>, approximately, with deeping within the crown. The light saturation point, quantum yield, light compensation point and dark respiration rate also varied with deeping. These results suggest that the photosynthetic properties vary gradually from sun to shade leaves along the light attenuation within a beech crown. At light saturated condition, the stomatal conductance and mesophyll conductance were strongly correlat-ed with A_<max> among the four different heights (r > 0.96, respectively). The C_i/C_a ratio was around 0.8, and there were no remarkable differences among the four different heights. These results suggest that the vertical gradient of A_<max> depends on the variation of mesophyll conductance. The stomatal conductance may be also one of the major factor in the vertical gradient of A_<max>. However the intercellular CO_2 concentration doesn't influence the vertical gradient of A_<max> within the crown.

• 日本森林学会の論文
• 1999-02-16

著者

• Kakubari Yoshitaka

  Faculty Of Agriculture University Of Shizuoka

• Kakubari Y

  Univ. Shizuoka Shizuoka Jpn

• Saito Hideyuki

  Faculty of Agriculture, University of Shizuoka

• Saito Hideyuki

  Faculty Of Agriculture University Of Shizuoka

関連論文

• Photosynthesis and Chlorophyll a Fluorescence of Two Poplars under Water Stress
• Drought-dependent Responses of Photosynthesis,Transpiration and Water Use Efficiency of Japanese Cypress and Japanese Red Pine Seedlings
• Spatial and Seasonal Variations in Photosynthetic Properties within a Beech (Fagus crenata Blume) Crown

スポンサーリンク