枣麦间作系统中光能在作物群体内分布的数值模拟

Digital modeling of light distribution within the crop canopy in jujube-wheat interplanting system

应用农业气象学原理和方法 ,依据实测资料 ,分析了枣麦间作系统中枣树带遮荫宽度及阴影内的相对光照度的时空变化规律 ,以及遮荫区、非遮荫区内小麦群体的光能垂直分布特点 ;应用数理方法 ,模拟了遮荫区及非遮荫区内小麦群体光能垂直分布曲线 .结果表明 ,南北走向的枣树带每天早、晚其遮荫区域较宽 ,相对光照度较大 ;中午前后 ,遮荫区域宽度较窄 ,相对光照度较小 .尽管遮荫区与非遮荫区内小麦群体的光能垂直分布有明显的差异 。

On the basis of field observation and with the principles and methods of agricultural meteorology,the daily variations of the shadow width of jujube tree belts and the relative light intensity were analyzed in the jujube—wheat interplanting system,and the characteristics of vertical distribution of the light within the wheat canopy inside and outside the shadow were studied. The sunshine vertical distribution curves in the wheat canopy inside and outside the shadow were simulated by mathematical methods. The results showed that the shadow area of the south north planting jujube tree belts was fairly wider,but the relative light illuminance was larger in early morning and late afternoon than at about noon.Although the sunshine vertical distribution in the wheat canopy inside and outside the shadow was obviously different,they both observed the decreasing law for Gauss Curve.