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大豆晴天群体光合作用农业气象数值模拟
AN AGROMETEOROLOGICAL MODEL OF PHOTOSYNTHESIS IN SOYBEAN CANOPY
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摘要: 运用农业气象、气象学等知识建立了一个晴天大豆群体光合农业气象数值模式.模式考虑了大豆叶片空间结构特征及本身生物学特征, 积分达到了瞬时时间尺度, 可以较准确地模拟出群体光合日变化过程, 平均模拟误差在8.7%左右, 并较好地反应了大豆群体光合午休过程.利用该模式进行数值分析, 给出了CO2、辐射及温度对群体光合午休影响的一些规律, 从而为作物超高产攻关提供了一定的理论指导.Abstract:
A numerical model for simulating the photosynthesis of soybean canopy was established. The model includes sub-models for simulating diurnal variations of radiation. Temperature and CO2 density as well as the plant physiological sub-model which includes photosynthesis and respiration of soybean leaves. The results show that the mean error is about 8.7% when it is used for simulation the diurnal variation of photosynthesis in soybean canopy, and the model can simulate the process of midday depression of photosynthesis in soybean canopy accurately. Influence of the single factor on canopy photosynthesis was given by numerical analysis using the model, which provides a theoretical basis for raising the yield of soybean in Huanghuaihai Region.
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图 2 1998年7月31日大豆群体光合午休模拟(a) CO2浓度一天中保持330 × 10-6不变(b)考虑CO2日变化过程(○代表冠层光合作用实测值, 实线代表冠层光合作用模拟值; 虚线代表不同层次冠层的光合用, 由上至下依次对应叶面积深度0~1, 1~2, 2~3, 3~3.347)
表 1 大豆倾角叶面积分布密度(1998年7月30日)
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