摘要
应用LI-6400便携式光合作用测定系统,测定了不同土壤条件下少花龙葵叶片的光响应曲线.结果表明:在土壤水分和有机质含量较低的生境中,少花龙葵上部叶与下部叶均具有较高的光合能力;其中下部叶利用强光和弱光能力均较强,并具有较高的水分利用效率.在土壤水分、有机质含量适中的生境中,少花龙葵上部叶的净光合速率与蒸腾速率较低;少花龙葵下部叶的净光合速率和蒸腾速率均较高,水分利用效率低于上部叶;少花龙葵的光合能力上部叶较弱,下部叶较强.土壤水分和有机质含量较高的生境中,少花龙葵叶片水分利用效率下降,光合能力较弱.
The photosynthetic characteristics of S. photeinocarpum under different soil conditions had been measured by LI-6400 photosynthetic measurement system. The results showed that the upper and under leaves of S. photeinocarpum had higher photosynthetic capacities in habitats of lower soil moisture and poor organic matter. The under leaves of S. photeinocarpum indicated evident endurance abilities for strong light and weak light and had higher water use efficiencies at the same time. For habitats with moderated soil moisture and soil organic content, the net photosynthesis rate and transpiration rate of upper leaves were lower than that of under leaves, but the water use efficiency of upper leaves was higher than that of under leaves. Which predicated that photosynthetic capacities of upper leaves were poor but that of under leaves were strong. Water use efficiency and photosynthetic capacity of leaves of S. photeinocarpum decreased respectively in habitats with higher soil moisture and rich soil organie content.
出处
《肇庆学院学报》
2008年第5期41-45,共5页
Journal of Zhaoqing University
基金
肇庆学院自然科学研究基金资助项目(0544)
肇庆学院博士科研启动基金资助项目
关键词
光合速率
蒸腾速率
水分利用效率
少花龙葵
photosynthesis rate
transpiration rate
water use efficiency
S. photeinocarpum