估计土壤水分特征曲线的间接方法研究进展

土壤水分特征曲线是模拟水分和化学物质在非饱和土壤中运移的关键参数。对于一个较大范围的实际问题，由于其在空间和时间上的强烈变异性，采用直接实验大量测定通常是不可行的。作为一种替代方法，根据土壤基本性质如粒径分布、容重、有机质含量等间接估计水分特征曲线的方法在实践中证明效果是比较理想的。按照其理论基础，这些间接方法可以分为土壤转换函数、物理 _经验方法、分形方法等。本文对该领域近二十多年来的研究进展进行了综述，并对间接方法的发展前景作了展望。

A review of development in estimating soil water retention characteristics from soil data

Soil water retention characteristics served as a vital parameter in modeling water movement and chemical transport in unsaturated soil.Due to great spatial variability of this hydraulic property, direct measurement seems to be infeasible and even impossible, especially for a field scale problem.As an alternative, indirect methods which relating water retention characteristics with more easily avaliable basic soil properties such as particle size distribution, bulk density, etc.,had proven to be practical by various authors. According to the theoretical background and algorithms used to construct,indirect methods may be classified into three categories, ie.,pedotransfer functions,physico empirical method and fractal method.This paper provides as a review of the progress achieved during the last two decades. Further application and development of indirect methods are also discussed.