摘要
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.
Physiological changes of photosynthesis and transpiration in different growing stages of wheat have been studied via controlling CO2 concentration with three levels of 700, 500, and 350×10-6. The net photosynthetic rate (Pn) increses and transpiration coefficient (Ek decreases as CO2 concentration goes up. Compared with 350×10-6, the Pn's with 700 and 500×10-6 increase 20. 0%～41. 6% and 7. 6%～18. 4%, the photosynthetic durations prolong 1h. and 0. 5h. per day, the Ek's decrease 4. 7%～16. 8% and 3. 5%～9. 2%, and the efficiency of water enhancer 4. 9%～19. 9% and 3. 6%～10.0%, respectively. But the effects of CO2 on Pn and Ek vary with growing stages of wheat. The sensitive periods to CO2 concentration are in heading time for Pn and in flowering time for Ek.
出处
《作物学报》
CAS
CSCD
北大核心
1996年第3期340-344,共5页
Acta Agronomica Sinica
关键词
小麦
光合作用
蒸腾系数
二氧化碳浓度
Doubling CO2 concentration
Wheat
Photosynthesis
Transpiration coefficient
