摘要
研究了不同光照条件下3年生曼地亚红豆杉幼苗的光合生理特性,结果表明:自然光、1层遮荫、2层遮荫条件下生长的曼地亚红豆杉光饱和点分别为:887μmol·m-2·s-1,763μmol·m-2·s-1,650μmol·m-2·s-1;光补偿点分别为117μmol·m-2·s-1,96μmol·m-2·s-1和87μmol·m-2·s-1.遮荫增加了幼苗叶绿素含量,而叶绿素a的含量A与叶绿素b的含量B的比值降低,光呼吸速率升高,暗呼吸速率降低.1层遮荫下生长的幼苗叶绿素含量、表观量子效率、叶片厚度、叶面积及生物量最高.1层遮荫(50%透光率)的环境是曼地亚红豆杉在重庆低海拔地区较适宜的光环境.
The photosynthetic physiological characteristics of 3yearold Tmedia cvHicksii grown at different light conditions are studied. The results showed that the light saturation points of Tmedia cvHicksii grown at natural light condition, onelayer shady and twolayer 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. Onelayer 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 Tmedia cvHicksii is 50% natural light intensity in the low altitude region of Chongqing.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第1期117-121,共5页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家863项目资助(2002AA212191)
重庆市科技攻关项目资助(2002-6222).
