【摘要】 地表温度是土壤中热传导的热源温度，也是土壤中热传导方程的边界条件。根据地表温度实测值，用3阶FOURIER级数逼近，可求得地表温度的表达式，并以此作为边界条件求土壤中的温度分布，可得到很好的近似。更多还原

【Abstract】 The temperature of the earth’s surface is the source of heat transfer and boundary condition of heat transfer equation in soil. In this paper the authors have used a 3 -order Fourier series to approach the measuring temperature value of the earth’s surface. By taking this as a boundary condition,the equation for the temperature distrubition in soil and the best approaximation will be obtained .更多还原