辣木是一种经济价值高的热带植物，前期已成功在韶关引种.在此基础上，研究了辣木在不同CO2体积分数下的光合速率的变化，结果表明：辣木在不同CO2体积分数（3 250~400 L/L）下的净光合速率不同，当叶室CO2体积分数在700~450 L/L时，净光合速率最大，继续增加CO2体积分数,辣木叶片的净光合速率会降低，体积分数越高降低幅度越大，在高CO2体积分数时净光合速率会下降为负值.胞间CO2体积分数随着叶室CO2体积分数的增加而增加，气孔导度和蒸腾速率随CO2体积分数增加的变化不大.
Moringa (Moringa oleifera Lam.) is a kind of tropical plants with high economic value. It has been successfully introduced in Shaoguan. The variation of photosynthetic rates of Moringa under different CO2 concentrations was studied. The results showed that net photosynthesis rate of Moringa under different CO2 concentrations (3 250~400 L/L) was different. The highest net photosynthetic rate was obtained under the CO2 concentration between 700~450 L/L. After that, continuing increase of CO2 concentration will lead to the decrease of net photosynthesis rate of Moringa. The higher the CO2 concentration increase, the greater the decline of net photosynthesis will be, even drop to negative. With the increase of CO2 concentration in leaf chamber, intercellular CO2 concentration will be increased. Meanwhile, the variation of stomatal conductance and transpiration rate were not significant.