不同株型玉米光截获模拟研究

Study of Light Interception Simulation of Different Plant Types of Corn

作物的高产与本身的结构有着十分密切的关系,玉米的叶倾角对玉米产量及品质起着决定作用。通过将一维辐射传输模型(考虑不同叶倾角)与农田生态系统模型相结合研究不同株型玉米的光截获量和冠层有效辐射,分析比较了不同株型(叶倾角)玉米截获辐射与光能利用的关系。结果表明:在叶面积指数较低时,偏平伸型植株截获的总光合有效辐射大于偏直立型;在叶面积指数较高时,不同株型玉米截获的总光合有效辐射差别不大。对于玉米的整个冠层结构而言,1～2层偏平伸型植株截获的光合有效辐射大于偏直立型;3～4层2种株型截获的光合有效辐射差别不大;5～10层偏直立型植株截获的光合有效辐射大于偏平伸型。

The leaf inclination played decisive roles in yield and quality of corn. Combining the one-dimensional radiative transfer model with farmland ecosystem model, the light interception and effective radiation of canopies of different plant types of corn were studied, and the relationship between intercepted radiation and light utilization was analyzed. The results showed that when the leaf area index was low, the photosynthetic available radiation （PAR） intercepted by the flat type was higher than that intercepted by the erect one. When the leaf area index was high, the PAR of different plant types had little difference. From the view of entire canopy, the PAR intercepted by the flat type of hayer 1 - 2 was higher than that intercepted by the erect one, that intercepted by the flat type of layer 3 -4 had little difference with that intercepted by the erect one, and that intercepted by the erect type of layer 5 - 10 was higher than that intercepted by the flat one.