| 玉米株型与冠层光合作用的数学模拟研究——Ⅰ.模型与验证 |
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| 引用本文： | 于强,王天铎,刘建栋,孙菽芬.玉米株型与冠层光合作用的数学模拟研究——Ⅰ.模型与验证[J].作物学报,1998(1). |
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| 作者姓名： | 于强 王天铎 刘建栋 孙菽芬 |
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| 作者单位： | 中国科学院上海植物生理研究所 上海200032(于强，王天铎)，南京大学大气科学系 江苏南京210093(刘建栋)，中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室 北京100080(孙菽芬) |
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| 摘 要： | 建立了一个对冠层结构具有高分辨率的作物冠层光合作用模型.包括冠层结构模型、冠层光分布模型和叶面光合作用模型.将作物冠层按叶面积指数划分为若干层次.上下层次之间,水平面太阳辐照度按Monsi和Saeki的指数递减模型分布.冠层对太阳漫射光的消光系数由作物株型确定,对直射光的消光系数由株型和太阳位置确定.在同一层次中,作物株型按Ross-Nilson的叶倾角分布模型,将叶面位置划分为8个方位,6个倾斜角.设同一层中水平面辐照度相同,某一方位角和倾角的叶面直射光以太阳轨道方程确定.用玉米冠层的实测资料验证了辐射分布模型和叶片的光合作用模型.敏感性试验表明,模型对输入因子有良好的响应.本模型对冠层光合作用的理论研究、作物生长的数学模拟等有一定的意义.
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| 关 键 词： | 冠层结构 光合作用 模型 |
A Mathematical Study on Crop architecture and Canopy Photosynthesis I . Model |
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| Yu Qiang Wang Tianduo Liu Jiandong,Sun Shufen.A Mathematical Study on Crop architecture and Canopy Photosynthesis I . Model[J].Acta Agronomica Sinica,1998(1). |
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| Authors: | Yu Qiang Wang Tianduo Liu Jiandong Sun Shufen |
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| Abstract: | A crop canopy photosynthesis model with high resolution, which includes a canopy architecture submodel, a canopy light distribution submodel and leaf surface photosynthesis submodel has been developed. The crop canopy is divided into several layers of unit leaf area index (LAI). Solar radiation on horizontal plane is calculated by Monsi-Saeki exponential function model. The extinction coefficient for diffuse and direct radiation is given by crop canopy architecture and solar position. A leaf is divided into irradiated and shaded areas, and the photosynthesis rates are calculated seperately. The intensities of direct light on leaf surface with different orientation and declination are determined by solar orbit equation. The light response of photosynthe-sisis modeled by a curve which approaches a maximum in a negative exponetial way. The light distribution submodel and leaf photosynthesis model are validated by observed data in maize canopy. The running of the model gives results which accord well with the results of some experimental studies. The model responds well to inputed factors. |
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| Keywords: | Canopy architecture Photosynthesis Simulation |
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