The Temperature System of Flooded Rice Fields
Qian Liying;Shangguan Xinglian;Wang Mingxing;Shen Renxing(Laboratory of Atmospheric Boundary Layer Physics and Chemistry Department of Atmospheric Chemistry and Radiation Iustitute of Atmospheric Physics, Chinese Academy of Seiences)
1994, 15(03):
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The temporature system of rice fields include the temperature of air, water and soil,During aclear day,from soil(from deep to sliallow)to water and to air,the vertical temperarure profile ap-pears progressive increase rapidly after air temperature starts to rise in the morning,its oblique extentis the greatest when air temperature reaches highest in the afternoon. But in the evening,upper part ofthe profile starts to change to progressive decrease,and the progressive decrease layer moves deeperand deepor in the soil.In clear weather,the diurnal variation of air temperature is a sine function ,and so are those of the water and soil temperatures, Water and soil temperatures relate closely with airtemperatures,so that their diurnal variation can be calculated by the daily average of air temperature. The diumal variations of temperatures are complicated during a cloudy and rainy weather, with a dist-inguishing feature:the soil temperatures are higher than that of water , and that of water higher thanthat of air. The seasonal variation of daily average of air temperature for late rice can be fltted by a γfunction. Combined the obtained empirical formula,the simulation of this work can forecast quite wellthe average CH_4 flux from late rice growing fields.