测量了紧凑型夏玉米 (掖单 1 3)群体的太阳总辐射和光合有效辐射 ( PAR)的反射率、透过率和截获率 .结果表明 ,紧凑型夏玉米具有直立型叶片的透光和截获特点 ,抽雄前总辐射和 PAR的消光系数分别为 0 .2 84和 0 .40 1 ,良好的透光特性使紧凑型夏玉米比平展型的能承受更大的种植密度 .雄穗的透过率约为 75% ,去掉部分雄穗能改善叶簇的光照条件 .本文探讨了总辐射和 PAR的日平均截获率 (āQ)和 (āu)和绿色叶面积指数 ( L )的关系 The solar radiation and photosynthetic active radiation (PAR) reflectance, transmissivity and interception rate of the compact summer maize (Yedan 1 3) population were measured.The results showed that the compact summer maize had the characters of translucent and Interception characteristics, tasselling total radiation and PAR extinction coefficient of 0.284 and 0.401 respectively, good light transmission properties of compact summer maize than the flat type can withstand greater planting density. The pass rate is about 75%, and the removal of some tassels can improve the light conditions of leaf clusters.This paper discusses the relationship between the average average interception rate of PAR (āQ) and (āu) and the green leaf area index (L)