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《Acta Prataculturae Sinica》 2011-04
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Studies on crop coefficients of typical steppe in Inner Mongolia

HOU Qiong1,WANG Ying-shun2,SHI Gui-hua2,YANG Ze-long1(1.Inner Mongolia Meteorological Institute,Huhhot 010051,China;2.Xilinhaote National Climate Observatory,Xilinhaote 026000,China)  
Based on data of field water experiments on typical steppe of Inner Mongolia in 2008,a crop coefficient of the typical steppe was calculated from analysis of the water amount balance,and changing regularity during the growing season.Simulation equations of the crop coefficient built with number of days after grass revival in a year and accumulated temperature above 0℃,showed that simulation using a cubic polynomial expression was appropriate and correlation coefficients were all over 0.94.Typical values of crop coefficients were defined with a linear section method of FAO,and they were 0.43 in the initial growing period,1.02 in the medium growing period and 0.90 in the final stage.A method of revising the crop coefficient of typical steppe under stress conditions was put forward with leaf area index(LAI).The crop coefficient given in this article was suitable for typical steppe in Inner Mongolia,because simulating calculation of soil water was mostly close to the results of actual observations with mean relative simulation errors of 6.2%-13.6%.
【Fund】: 国家自然科学基金项目(30760102)资助
【CateGory Index】: S812.8
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