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本文在活体测量的基础上，分析了７个甘蔗示范品种和对照种闽糖７０－６１１在不同光合有效辐射（ＰＡＲ）下＋１叶的净光合速率（Ｐｎ）、光呼吸强度（ε）、水分利用效率（ＷＵＥ）的变化情况，并对冠层总的同化量进行估算。结果表明：甘蔗不同品种＋１叶的Ｐｎ随ＰＡＲ变化较大，但冠层总的同化量与单叶的Ｐｎ没有明显的相关性，各品种的光呼吸强度不大，变化在２．２×１０－２－２．５×１０－２μｍｍｏｌ·ｍ－２·ｓ－１之间；ＷＵＥ除福农８９－２０９、福蔗８７－１０与对照品种相当外，其余均比对照种高，且这种差异与Ｐｎ无正相关性。
Based on the in vivo measurements, the net photosynthetic rate (Pn), photorespiratory intensity (ε), water content (P), photosynthetic rate and photosynthetic rate of seven sugarcane cultivars and the control cultivar Fujian 70-611 under different photosynthetically active radiation (PAR) Utilize the change of efficiency (WUE), and estimate the total assimilation amount of the canopy. The results showed that the Pn of the leaves of different varieties of sugarcane varied greatly with PAR, but the total assimilation amount of canopy did not have significant correlation with Pn of single leaf, and the intensity of photorespiration of each variety was not significant, with a variation of 2.2 × 10 -2-2.5 × 10-2μmmol · m-2 · s-1; WUE was higher than that of the control except Fu-nan 89-209 and Fukang 87-10, There is no positive correlation between the difference and Pn.