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本文对ＣＩ—３０１ＰＳ光合测定系统的时间间隔和空气流速与净光合速率（Ｐｎ）和蒸腾速率（Ｅ）变异系数的关系进行回归分析，结果表明，ＣＩ—３０１ＰＳ光合测定系统测定Ｐｎ和Ｅ较理想的时间间隔为２４．０～２８．０Ｓ，空气流速为０．５１～０．６６ＬＰＭ。综合分析建议测定甘蔗光合作用时采用０．６０ＬＰＭ的空气流速和２５．０Ｓ的时间间隔。
The regression analysis of the time interval and the relationship between air flow rate and the coefficient of variation of net photosynthetic rate (Pn) and transpiration rate (E) of CI-301PS photosynthesis system was carried out. The results showed that the determination of Pn and E by CI-301PS photosynthesis system was more satisfactory The time interval is 24.0 ~ 28.0S, the air flow rate is 0.51 ~ 0.66LPM. The comprehensive analysis suggests that the air flow rate of 0.60 LPM and the time interval of 25.0S should be used to determine the photosynthesis of sugarcane.