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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。
Surface temperature is the heat source temperature of heat conduction in the soil and is also the boundary condition of the heat conduction equation in the soil. According to the measured values of the surface temperature, the expression of the surface temperature can be obtained by approximating the FOURIER series with the third order, and using this as the boundary condition to find the temperature distribution in the soil, a good approximation can be obtained.