大气CO_2浓度升高对小白菜生长发育及品质的影响

Effects of Elevated [CO_2] on Pakchoi Growth and Quality

随着经济发展,人类活动导致大量温室气体排放,使大气CO_2浓度持续升高。小白菜因其富含多种营养元素已逐渐成为人们所青睐的绿色蔬菜之一。研究高CO_2浓度环境中小白菜的生长状况,将有助于了解未来气候变化后小白菜生长发育的变化,为未来气候变化背景下蔬菜生产提供理论依据。利用OTC(Open top chamber)系统对小白菜生长发育及光合受高CO_2浓度的影响进行了研究。结果表明,大气CO_2浓度升高后,小白菜的净光合速率在幼苗期和营养生长期均极显著增加,增幅分别为277.48%和58.76%;气孔导度和蒸腾速率在幼苗期显著增加,而在营养生长期无显著变化;水分利用率在幼苗期和营养生长期均显著增加;单株鲜质量、干质量、叶绿素和类胡萝卜素含量均显著增加,但叶片中的Vc含量显著下降。高CO_2浓度可以提高小白菜的产量,但同时会对其营养品质造成负面影响。

With the economic development, human activities lead to a large number of greenhouse gas emissions, elevated atmospheric CO_2 concentration. Pakchoi has gradually become one of the favored green vegetables because of its rich variety of nutrients.The study on the growth of pakchoi in high CO_2 concentration environment is helpful to understand the change of growth and development of pakchoi in the future climate change and provide theoretical basis for future vegetable production under climate change background.The OTC（Open top chamber）system was used to study the effects of CO_2 concentration on growth and photosynthesis of pakchoi. The results showed that the net photosynthetic rate（Pn）of pakchoi significantly increased at 277.48% and 58.76% at seedling stage and vegetative stage respectively after the increase of atmospheric CO_2 concentration. The stomatal conductance and transpiration rate increased significantly at seedling stage. The fresh and dry quality, chlorophyll content and carotenoid content significantly increased, but the Vc content in leaves decreased significantly. The water use efficiency increased significantly in seedling stage and vegetative stage.High CO_2 concentration could improve the yield of pakchoi, but it would have a negative impact on its nutritional quality.