一、叶片净光合速率。叶片的净光合速率因种、品种、同一品种不同生育时期,都有明显的变化。大豆叶的光合速率大致在8—40毫克CO_2/分米~2·小时,最高可达60毫克CO_2/分米~2·小时。大豆品种一天中光合速率峰值越高,持续时间越长,对于物质生产越有利。二、大豆冠层光合作用。大豆的产量与冠层的光合 First, the net photosynthetic rate of leaves. Leaf net photosynthetic rate due to species, variety, the same species of different growth stages, there are significant changes. Soybean leaf photosynthesis rate of about 8-40 mg CO 2 / dm ~ 2 · hours, up to 60 mg CO 2 / dm ~ 2 · h. Soybean varieties in a day the higher the peak photosynthesis rate, the longer the duration, the more favorable for the material production. Second, the canopy photosynthesis of soybeans. Soybean Yield and Canopy Photosynthesis