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本文对陕西泾阳地区冬小麦田净辐射进行了分段和分层模拟，取得了较好的拟合效果，相对误差在１０％以内。确定了麦田相对叶面积函数最大值的出现高度为４．５／７Ｈ，介于高粱（４／７Ｈ）和谷子（５／７Ｈ）之间。计算了不同发育期、不同层次至冠层顶部累积叶片的消光系数，结果表明，消光系数因发育期和叶片层次而异，拔节期，由旗叶向下，消光系数增大，乳熟期旗叶的消光系数最大，比拔节期大一倍，倒二叶以上两个层次叶片消光系数较小。就平均而言，冬小麦消光系数拔节期为０．５１，乳熟期为０．５６。本项成果为进一步开展麦田小气候研究提供了有意义的数据和方法。
In this paper, the net radiation of winter wheat field in Jingyang area of Shaanxi Province was simulated by subdivision and stratification, and a good fitting result was obtained with the relative error less than 10%. The maximum of relative leaf area function in wheat field was determined to be 4.5 / 7H, which was between sorghum (4 / 7H) and millet (5 / 7H). The extinction coefficient of accumulated leaves at different developmental stages and top of canopy was calculated. The results showed that the extinction coefficient was different due to development stage and leaf level, and the jointing stage, the flag leaf was downward, the extinction coefficient increased, The leaf extinction coefficient is the largest, one time larger than the jointing stage, and the leaf extinction coefficient of the two layers above the second leaf is smaller. On average, the extinction coefficient of winter wheat was 0.51 at jointing stage and 0.56 at milky milky stage. This result provides meaningful data and methods for further research on microclimate in wheat field.