Modeling of the land surface water‐, energy‐, and carbon balance provides insight into the behavior of the Earth System, under current and future conditions. Currently, there exists a substantial variability between model outputs, for a range of model types, whereby differences between model input parameters could be an important reason. For large‐scale land surface, hydrological, and crop models, soil hydraulic properties (SHP) are required as inputs, which are estimated from pedotransfer functions (PTFs). To analyze the functional sensitivity of widely used PTFs, the water fluxes for different scenarios using HYDRUS‐1D were simulated and predictions compared. The results showed that using different PTFs causes substantial variability in predicted fluxes. In addition, an in‐depth analysis of the soil SHPs and derived soil characteristics was performed to analyze why the SHPs estimated from the different PTFs cause the model to behave differently.

中文翻译：

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模拟土壤水平衡通量时，Pedotransfer函数的选择很重要

通过对陆地表面水，能源和碳平衡进行建模，可以洞悉当前和未来条件下地球系统的行为。当前，对于一系列模型类型，模型输出之间存在很大的可变性，因此模型输入参数之间的差异可能是重要的原因。对于大规模的土地表面，水文和作物模型，需要土壤水力学特性（SHP）作为输入，并根据pedotransfer函数（PTF）进行估算。为了分析广泛使用的PTF的功能敏感性，使用HYDRUS-1D模拟了不同情况下的水通量，并对预测值进行了比较。结果表明，使用不同的PTF会导致预测通量的显着变化。此外，为什么从不同的PTF估算出的SHP会使模型的行为有所不同。