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《Journal of Nanjing Institute of Meteorology》 2004-01
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Numerical Simulation of the Impact of CO_2 and Temperature Changes on Crop Canopy Photosynthesis

LIU Jian-dong~1,LIU Wen-quan~1,YU Qiang~2,JIN Zhi-qing~3 (1.Chinese Academy of Meteorological Sciences,Beijing100081,China; 2.Institute of Geographic Sciences and Resources Research,CAS,Beijing100101,China; 3.Jiangsu Academy of Agricultural Sciences,Nanjing210014,China)  
The leaf photosynthesis of LU-MAI 23 is measured with Licor-6200 Portable Photosynthesis Analyzer,and the curves of leaf photosynthesis response to CO_2 and radiation are determined.Based on these measurements,a leaf photosynthesis model is established,then the leaf model is scaled up to a winter wheat canopy photosynthesis model of simultaneous time scale and leaf surface spatial scale,which can simulate the canopy photosynthesis accurately.Results of the numerical simulation show that (1)on a fine day,the canopy photosynthesis increases with CO_2 enhancement,and the daily total photosynthesis will increase by 19.7% when the CO_2 concentration increases from 330×10~(-6) to 660×10~(-6);(2)the canopy photosynthesis increases with radiation enhancement,and the daily total photosynthesis will increase by 6.7% when the radiation increases by 10.0%;(3)the canopy photosynthesis decreases with temperature increasing,and the daily total photosynthesis will decrease by about 2.9% when the temperature increases 1 ℃.The comprehensive numerical analysis indicates that the total daily canopy photosynthesis will become more sensitive to the variation of CO_2 and temperature under stronger radiation conditions.
【Fund】: 国家自然科学基金重点资助项目(40233034);; 国家"十五"攻关资助项目(2001BA509B13)
【CateGory Index】: S311
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