中文摘要：

结合不同类型的大田试验数据,分别利用瞬时剖面法、HYDRUS反演方法、直接方法反求土壤水力参数。将所得参数代入HYDRUS正演程序,分别预测试验后期剖面含水率,并与实测值对比。结果表明,瞬时剖面法与HYDRUS反演方法预测结果相近且优于直接方法。在实测范围内,前2种方法所得参数虽略有差异,但预测结果和表征的水力性质基本一致。直接方法由于试验尺度小、对土壤扰动大,结果并不理想。对比求参工作量,2种反演方法小于直接方法。2种反演方法计算成本对比,瞬时剖面法比HYDRUS反演方法更有优势。

英文摘要：

Three methods,i.e.,Instantaneous Profile Method,HYDRUS Inverse Method and Direct Method,were applied to estimate the field-scale soil hydraulic parameters with different experimental data.The comparison of the measured soil moisture data with the predicted data by HYDRUS showed that the results of the two inverse methods,which had much similarity to each other,were better than that of the Direct Method.Although the soil hydraulic parameters derived from the two inverse methods were not exactly the same,the predicted results and the hydraulic properties they presented matched well with each other in the range of measured values.The poor performance of the Direct Method was attributed to the small scale and soil disturbance during experiment.The two inverse methods were less complex and easier to handle than the Direct Method.Moreover,the computational cost of the Instantaneous Profile Method was lower than the HYDRUS Inverse Method.