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近几十年的观测证实到达地球表面的总辐射呈逐年下降的趋势(即“全球变暗”现象),伴随这一现象的是其散射辐射比例的增加.很多观测表明散射辐射比例增加能够显著提高植物光合生产能力,但其机理并不十分明确.本文采用三维建模方法,利用由田间原位测定的灌浆期水稻群体空间结构数据构建三维冠层模型,使用考虑了入射辐射几何特征的冠层三维光分布模型,模拟了冠层的光分布和光合生产潜力.结果表明,在入射总辐射一定范围内降低的情况下,水稻群体光合速率可因散射辐射比例增加而显著高于入射总辐射未降低时的值,其原因是散射辐射比例增加显著降低了群体中低于光补偿点的叶面积比例,同时显著提高了位于光响应曲线线性部分的叶面积比例.散射辐射比例的变化对冠层上部叶片的光强分布和光合速率有显著影响.基于三维模型进行模拟其计算量巨大,本文采用高性能计算系统以并行机制构建模型,很好地解决了这个问题.
Recent decades of observations have confirmed that the total radiation reaching the Earth’s surface has been declining year by year (that is, the “global darkening” phenomenon), which is accompanied by an increase in the proportion of scattered radiation. Many observations indicate an increase in the proportion of scattered radiation Can significantly improve the photosynthetic capacity of plants, but the mechanism is not very clear.In this paper, a three-dimensional modeling method was used to construct a three-dimensional canopy model using the spatial structure data of rice population in the filling stage in situ, And the photosynthetic potential of the canopy were simulated.The results showed that the photosynthetic rate of rice population could be significantly higher than that of the incident radiation due to the increase of the proportion of scattered radiation under a certain range of total incident radiation The reason why the total radiation did not decrease was that the proportion of scattered radiation significantly reduced the proportion of leaf area below the light compensation point in the population and significantly increased the proportion of leaf area located in the linear part of the light response curve. Had a significant effect on the light intensity distribution and photosynthetic rate of the upper canopy leaf.The calculation was based on the three-dimensional model Large, they use high-performance computing systems to build parallelism model, a good solution to this problem.