摘要
通过不同CO2浓度处理的大豆实验观测,分析了大豆叶片净光合速率、蒸腾速率、水分利用效率、叶绿素含量等光合特性对大气CO2增加的响应,探讨了未来高CO2水平下水分利用效率的变化趋势.结果表明,高CO2浓度下,大豆开花期叶片光合午休现象得到缓解和消除,净光合速率提高19.4%～33.0%.大豆蒸腾速率随大气CO2浓度升高而下降.大气CO2增加促使大豆水分利用效率提高,在不同生育期提高幅度不同,表明为分枝期、开花期较大,结荚期、鼓粒期较小.在大气CO2增加情景下,叶绿素a、叶绿素b、叶绿素总量均有增加的趋势,分别提高8.6%～11.6%,13.8%～20.0%和9.9%～13.8%.但叶绿素a与叶绿素b的比值则下降.
The net photosynthesis, transpiration, water use efficiency, chlorophyll contents of soybean were measured under ambient and elevated CO2 conditions, and responses to elevated CO2 were discussed. The results showed that net photosynthesis rate increased by 19.4% and 33.0% under elevated (550 and 750μmol/mol)CO2, compared to the ambient air CO2 concentration. At the same time, midday depression of photosynthesis abated or disappeared in flowering stage. The transpiration rate decreased. The water use efficiency increased significantly. It was also found that chlorophyll a chlorophyll b, chlorophyll contents increased by 8.6%~11.6%, 13.8%~20.0%, and 9.9%~13.8% in soybean leaves. However, the ratio of chlorophyll a to b reduced.
出处
《中国农学通报》
CSCD
2005年第3期290-293,共4页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金资助项目(70271062)。
