When LAI is lower than 2, IPAR of intercropping is about 50% of that of monoculture;when LAI is larger than 2, IPAR is almost equal under two planting ways.

• 叶面积指数＜2时，间作冬小麦日平均光合有效辐射截获量约为单作的50%25，叶面积指数＞2时，2种种植模式下的日平均光合有效辐射截获量相近；