Effects of Elevated Carbon Dioxide Concentration and Temperature on Growth and Chlorophyll Fluorescence Reactions in Cinnamomum camphora Seedlings

• Main Authors: Her Guann Lin, 何冠琳
• Other Authors: Sheu Bor Hung
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/47209748003537066450

碩士 === 國立中興大學 === 森林學系 === 87 === The objectives of this study were to investigate the effects of elevated carbon dioxide concentration and temperature on the growth and chlorophyll fluorescence reactions in Cinnamomum camphora Seedlings. Seedling grown in 1.25 m3 open-top chamber, were treated with two different carbon dioxide concentration（385±3 ppm, ambient, 696±17 ppm）and two day/night temperature（28℃∕23℃, ambient, 32℃∕23℃）for eleven weeks. The growth performances of all treatments were enhanced by higher temperature treatment. In carbon dioxide concentration elevated condition, growth was enhanced under early few weeks, however, slight increase under later treatment weeks. The numbers of leaf, total leaf area, and dry matter of seedling were increased, and specific leaf area and leaf area ratio were decreased when seedlings were exposured in elevated carbon dioxide concentration and higher temperature condition. And there is no significant difference between ambient or higher temperature under ambient carbon dioxide concentration condition. In chlorophyll fluorescence reactions, in earlier treatment, the primary efficiency of light conversion of PSII（Fv/Fm） and potential activity of PSII（Fv/F0）were enhanced in each treatment. However, under elevated carbon dioxide concentration, the primary efficiency of light conversion of PSII, potential activity of PSII, photochemical quenching coefficient（qP）and quantum yield（Yield）were decrease, and non-photochemical quenching coefficient was increase. These mean that light reaction of photosynthesis was affected by elevated carbon dioxide concentration. These chlorophyll fluorescence reaction parameters of seedlings that were exposured in enhanced carbon dioxide concentration and higher temperature treatment showed no significance difference between ambient or higher temperature under ambient carbon dioxide concentration condition. Photosynthetic rate was slight decrease under higher temperature condition. But when seedlings were exposured in elevated carbon dioxide concentration treatment, photosynthesis rate was decreased significantly. The interaction efficiency between carbon dioxide concentration and temperature was no difference significantly.