At the same time, the photosynthetic rate (Pn) ascent and stomatal conductance descent of soybean have also promoted the water use efficiency (WUE).

• 与对照相比，CO_2激光处理大豆的叶绿素含量增加，光和速率上升，气孔导度下降，水分利用率上升，光合能力提高。