摘要
使用LI-6400便携式光合分析仪对热研3号俯仰臂形草的光合日动态进行了测定.结果表明,热研3号俯仰臂形草的净光合速率(Pn)日变化呈双峰型,蒸腾速率(Tr)和气孔导度(Gs)变化趋势与Pn相似.Pn与光合有效辐射(PAR)和Gs的相关程度均达到了极显著水平(P<0.01).PAR是影响光合作用最为强烈的环境因子,而Tr是受环境因子控制最为显著的生理参数.数据显示,热研3号俯仰臂形草是一种高光效植物.
Portable photosynthetic system was employed to determinate the photosynthetics of Brachiaria decurnbens cv. Reyan No. 3. The results showed that the net photosynthetic rate （ Pn ） of B. decurnbens cv. Reyan No. 3 had a diurnal change with two peaks. Transpiration rate （ Tr ） and stomatal conductance （ Gs ） were similar with Pn . There was a significant positive correlation between Pn and photosynthetic active radiation （PAR） （ P 〈 0.01） ,G,（P 〈0.01）. PAR had most intensive effect on the Pn , while Tr was most sensitive to the environmental factors. The data showed that B. decurnbens cv. Reyan No. 3 is a plant with high light use efficiency.
出处
《湛江师范学院学报》
2007年第3期100-103,共4页
Journal of Zhanjiang Normal College
关键词
热研3号俯仰臂形草
净光舍速率
蒸腾速率
气孔导度
Brachiaria decumbens cv. Reyan No. 3
net photosynthetic rate
transpiration rate
stomatal conductance
