通过对玉米和大豆间作系统中玉米的某些光合指标进行研究。结果表明，在间作种植方式下，玉米叶片的叶绿素含量、光合速率、蒸腾速率及气孔导度均表现为较单作不同程度的增大趋势；从整个生育期来看，4种光合指标的变化基本一致，都呈单峰型曲线变化。在抽雄期和灌浆期达到一个高峰，然后下降，但间作玉米下降的幅度要小于单作玉米。说明间作方式改善了玉米的光合作用条件，增强了玉米的光合能力。

The experiment on the photosynthesis indices of maize in the intercropping system of maize and soybean showes that the leaf chlorophyll content, photosynthesis speed, transpiration speed and stoma conductivity of maize are increased compared with single cropped plants. In the entire growing period, the change of the four photosynthesis indices are basically consistent, all assuming single hump curves. The peak is at the heading period of male flowers or milking period. After the peak, the indices drop. The drops of intercropping maize are slower than those of single cropping maize, which indicates that intercropping changed photosynthesis condition and increased photosynthesis.