摘要
采用LI-6400便携式光合测定系统（Li-Cor Inc．，USA）对岩黄连叶片的气体交换进行了测定。结果表明：（1）岩黄连叶片的光饱和点（LSP）为329．18μmol·m^-2·s^-1左右，光补偿点（LCP）为12．76μmol·m^-2·s^-1，最大净光合速率为2．96μmol·m^-2·s^-1，暗呼吸速率（Rd）为0．17μmol·m^-2·s^-1。光饱和点和光补偿点都比效低，表明岩黄连对光照的要求不高，属于阴生植物。（2）4月份，岩黄连Pn随CO2浓度升高而逐渐增大。当CO2浓度由50μmol·mol^-1增加到600μmol·mol^-1，Pn几乎呈直线上升，600～1000μmol·mol^-1范围内逐渐缓和，到1000μmol·mol^-1以后Pn变化平稳。由曲线估算CO2饱和点（CSP）大约在1000μmol·mol^-1左右。CO2的补偿点为68．80μmol·mol^-1。羧化效率为0．0308μmol·m^-2·s^-1。（3）岩黄连叶片水分利用率（WUE）随有效光辐射强度（PAR）的增强呈抛物线状变化，PAR在200μmol·m^-2·s^-1。内呈直线上升，到200μmol·m^-2·s^-1时WUE达最大值，大于200μmol·m^-2·s^-1后WUE呈逐渐下降趋势。
The gas exchange of Corydalis saxicola was measured in the field with Li-6400 Portable Photosynthesis （Li-Cor Inc. , USA）. The results were as follows.The light saturation point, light compensation point, maximum photosynthetic rate, and respiration rate for the leaf of Corydalis saxicola were 329. 18μmol·m^-2·s^-1 , 12.76 μmol·m^-2·s^-1 , 2.96 μmol·m^-2·s^-1 and 0.17 μmol·m^-2·s^-1 , respectively. The light saturation and compensation point were low. This indicated that C. saxicola was adapted to weak light, it＇s a shade plant. The net photosynthetic rate of C. saxicola increased with the raising of the concentration of CO2 in April. The net photosynthetic rate increased linearly when the concentration of CO2 was in 50μmol·mol^-1 to 600μmol·mol^-1 , after that, it increased slowly while the concentration of CO2 increased to 1 000μmol·mol^-1. It could be estimated from the A-Ci curve that the CO2 saturation and compensation point and the maximum carboxylation rate were 1 000μmol·mol^-1, 68.80μmol·mol^-1 and 0. 030 8μmol·m^-2·s^-1 respectively. The water use efficiency （WUE） of C. saxicola varied with the parabola model while the PAR increased. It increased linearly with the increasing of PAR till the PAR was 200 μmol·m^-2·s^-1 and then decreased gradually.
出处
《广西植物》
CAS
CSCD
北大核心
2006年第3期317-320,共4页
Guihaia
基金
广西科技攻关项目(桂科攻0235022-5)~~
