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以新红星成龄树为试材，对丰产稳产、低产和变产三类营养型树净光合速率测试证明，三类树不同物侯期净光合速率、最大峰值出现时期及生长季节的稳定性明显不同。反映树体光合能力的指标是叶幕形成后净光合速率强度和稳定性。
The results showed that the net photosynthetic rate of three types of tree species in different growth stages was significantly higher than that of the control group Significantly different. The index reflecting the photosynthetic capacity of tree is the net photosynthetic rate intensity and stability after the formation of leaf curtain.