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《Journal of Southwest China Normal University(Natural Science)》 2003-01
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Comparative Studie on Photosynthetic Characteristics of Taxus Media cv.Hicksii Grown at Different Light Condition

LU ZhanGen1,ZHAO ChangQiong2,HANYing3,TANFeng41Biological Department, HengShui Teacher College, Hebei Hengshui 053000, China;2Dept. of Life Science, FuLing Teacher College, Chongqing 408003, China;3Pasturage Bureau, HuaLong County, Qinghai Hualong 810900, China;4School of Life Science, Southwest China Normal University, Chongqing 400715, China  
The photosynthetic physiological characteristics of 3yearold Tmedia cvHicksii grown at different light conditions are studied. The results showed that the light saturation points of Tmedia cvHicksii grown at natural light condition, onelayer shady and twolayer shady light conditions are 877 μmol·m-2·s-1, 763 μmol·m-2·s-1 and 650 μmol·m-2·s-1 respectively; and light compensation points are 117 μmol·m-2·s-1, 96 μmol·m-2·s-1 and 87 μmol·m-2·s-1 respectively. Meanwhile, the contents of chlorophyll increase, the proportions of chlorophyll A/B decreased, and the light respiration rate raise, but the dark respiration rate cut down along with the weakening of light intensity of the growing environment. Onelayer shady plants indicate chlorophyll content, biomass, leaf thickness, leaf area, apparent quantum efficiency are biggest. It shows that the suitable light condition of the growth of Tmedia cvHicksii is 50% natural light intensity in the low altitude region of Chongqing.
【Fund】: 国家863项目资助(2002AA212191);; 重庆市科技攻关项目资助(2002-6222).
【CateGory Index】: Q945.11
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