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本文研究3种CO_(2)浓度(700、5OO、350×10～(-6))下,小麦各生育阶段净光合速率(P_(n))和蒸腾系数(E_(k))的变化.随着CO_(2)浓度增加,净光合速率增大,蒸腾系数减小、从拔节到乳熟,CO_(2)浓度700×10～(6)、500×10～(-6)比350×10～(-6)的净光合速率分别增长20.0%～41.6%和7.6%～18.4%;光合时间延长1和O.5小时/天;蒸腾系数减小4.7%～16.8%和 3.5%～9.2 %;水分利用率提高 4.9%～19.9%和36%～1O.0%.CO_(2)浓度对净光合速率Pn和蒸腾系数E_k的影响程度随生育阶段而有不同,光合速率在抽穗期增长最大,而蒸腾系数在开花期减小最甚.
In this paper, the changes of net photosynthetic rate (P n) and transpiration coefficient (E k) in different growth stages of wheat at three concentrations of CO 2 (700, 500, 350 × 10 -6) were studied. With the increase of CO 2 concentration, the net photosynthetic rate increased and the transpiration coefficient decreased. From jointing to milk ripening, CO 2 concentration was 700 × 10 ~ (6) and 500 × 10 ~ (-6) was 350 × The net photosynthetic rate of 10 ~ (-6) increased by 20.0% ~ 41.6% and 7.6% ~ 18.4% respectively; the photosynthetic time was extended by 1 and 0.5 hours / day; the transpiration coefficient decreased by 4.7% ~ 16.8% and 3.5% ~ 9.2 %. The water use efficiency increased by 4.9% -19.9% and 36% -1.0%. The influence of CO_ (2) concentration on net photosynthetic rate Pn and transpiration coefficient E_k varied with different growth stages, and photosynthetic rate increased at heading stage Maximum, while the transpiration coefficient decreased the most in flowering.