不同水分条件下CO_2浓度升高对植物生长及水分利用效率的影响

Response of plant growth and water use efficiency to different water contents under environmental CO_2 concentration raising.

研究分析了不同水分条件下CO_2浓度升高对植物生长、生理和水分利用效率等影响,指出水分亏缺下CO_2浓度升高有利于植物生长,植物叶面积增大,生物量增加,根/冠值增加,且改善植物气孔生理,减少水分蒸腾,提高叶水势,维持植物水分胁迫下正常光合作用,提高植物经济产量和水分利用效率。CO_2浓度升高一定程度补偿了水分亏缺对植物产生的负面影响,对农业节水增产有重要意义。

The paper analyzes the response of plant growth, physiological process and water use efficiency, etc. on different water conditions under CO2 concentration raising. The results show that CO2 raising will produce positive effect on plant growth under water deficient conditions, such as increasing of plant leaf area, dry biomass, and root / shoot ratio. Meanwhile, it can improve stoma physiology, reduce water transpiration, raise water potential of plant leaf, and enhance grain yield of crop and the water use efficiency, and compensate the adverse effect of water deficiency on plant growth and water use efficiency. This has an important meaning on waler saving and yield increasing of agriculture.