玉米株型与冠层光合作用的数学模拟研究

用数值方法，分析了直立和平伸两种株型结构在冠层光分布，光合作用分布，冠层光合作用速度、光合作用日变化和光合日总量等方面的差异。指出叶面积指数越大，太阳辐射越强、太阳高度角越大（在纬度越低的地区或赤纬越高的季节），把一般株型改造成直立株型的增产潜力增大。对于叶片光合效能较高的区域，季节或品种，直立株型的增产潜力也较大。植株由一组具有各种倾斜角的叶片组成。理想株型的叶片分布函数随上述环境的和生理的因素

A Mathematical Study on Crop Architecture and Canopy Photosynthesis II. Numerical Study

By taking account of light and photosynthesis distribution in a crop canopy, the differencies in photosynthesis rate and the diurnal variation of photosynthesis between canopies in planophile and erectophile leaves are analyzed by numerical methods. High solar ele vation or direct solar radiation within certain range, or high LAI and leaf photosynthetical effen- ciency under a place and/or seasons are conditions under which erectophiles are more productive than planophiles and the extent of advantages have been computed for a given latitude and sea son. The programe can be applied to any latitude and season. The leaf area distribution function in ideotype plant is determined by environmental and physiological factors montioned above. The programs developed can be used to assess the advantages of any ideotype under any given latitude and season, and therefore can be used for crop breeders, either to evaluate the cultivars obtained or to give objectives of crop breeding.