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利 用美国 Ｌ Ｉ－ １８８ Ｂ 辐射量 子照度仪 ，对掖单４ 号、掖 单１３ 和沈 单７ 号３ 种不同 株型玉米叶片 及群体光 能利用 状况进行 了测定研 究，结果 表明３ 种 玉米 品种 叶片 辐射 吸收 系数 存在 一定差异 ：掖单４ 号为０７５ ，掖单１３ 为０７３ ，沈单７ 号为０７１ 。利用三 次样条函 数模拟 了玉米群 体中太阳总辐 射及反 射辐射分 布状况， 给出了 不 同品 种玉 米 群体 中 吸收 辐射 随 高度 分布 特 征，发 现 在玉米叶片 光合能力 最大的８０ ～１８０ｃｍ 处 ，掖单４ 号吸收 辐射最 大，因而从 理论上 证实了紧 凑型玉 米品种光能 利用效 率最高，与 当前高 产实践相 一致，并 为玉米高 产提供 了理论指 导。
Using the American L I-188 B radiation quantum illuminometer, the light energy utilization status of three different types of maize leaves and groups of Yedan 4, Yedan 13 and Shendan 7 were studied. The results showed that three maize varieties Leaf radiation absorption coefficient there is a certain difference: Yedan No. 4 is 075, Yedan 13 is 073, Shen No. 7 is 071. The cubic spline function was used to simulate the distribution of total solar radiation and reflected radiation in maize population. The distribution characteristics of absorption radiation with different height of maize population were obtained. The results showed that at the height of 80-180 cm, the highest photosynthetic capacity of maize leaves, The largest absorption of radiation, and thus theoretically confirmed the compact corn varieties the highest light use efficiency, consistent with the current high yield practice, and provide a theoretical guidance for high yield of corn.