Pedotransfer functions (PTFs) describing soil water retention curves (WRCs) have been widely used in crop, soil, and land surface models. A limitation of the available PTFs is that they fail to account for shape changes in WRCs due to bulk density variations caused by soil tillage, compaction, and other processes. This study develops new PTFs that include bulk density effects on the WRC shape. A new framework is introduced to build the bulk density-associated PTFs based on a widely-used WRC dataset. The new PTFs were validated by comparing the performance with two common PTFs from the literature using two independent datasets. The results show that the newly developed PTFs provide reliable WRC estimates for the validation datasets, with mean RMSE values of 0.055 and 0.059 m³ m^-3, respectively. The accuracy of the new PTFs is comparable or in some cases better than the common PTFs. While the literature PTFs investigated do not always properly describe bulk density effects on WRC changes, the new PTFs effectively account for such effects on the WRC shape, thus have the potential to be integrated into crop and soil management models to represent bulk density impacts on WRCs due to anthropogenic (e.g., plowing and compaction) and natural (e.g., wetting/drying) processes.

描述土壤保水曲线（WRC）的Pedotransfer函数（PTF）已广泛用于作物，土壤和土地表面模型中。可用的PTF的局限性在于，它们无法解决WRC的形状变化，原因是土壤耕作，压实和其他过程造成的体积密度变化。这项研究开发了新的PTF，其中包括体积密度对WRC形状的影响。引入了一个新框架，以基于广泛使用的WRC数据集构建与体积密度相关的PTF。通过使用两个独立的数据集将性能与文献中的两个常见PTF进行比较，从而验证了新的PTF。结果表明，新开发的PTF为验证数据集提供了可靠的WRC估计，其RMSE平均值分别为0.055和0.059 m ³ m ^-3， 分别。新PTF的准确性是可比的，或者在某些情况下要比普通PTF更好。尽管所研究的文献PTF并不总是正确地描述容重对WRC变化的影响，但是新的PTF有效地解释了对WRC形状的这种影响，因此有可能被整合到作物和土壤管理模型中，以表示容重对WRC的影响。由于人为（例如耕作和压实）和自然（例如润湿/干燥）过程。