盐碱地水盐运移理论及模型研究进展

我国盐碱地分布广泛,总面积达3600万hm2,土壤盐渍化问题已经成为制约农业可持续发展的重要因素之一.盐碱地治理和改良的关键在于探究土壤水盐运移规律,而水盐模型是模拟和预测农田土壤水盐动态变化最为有效的途径.目前围绕土壤水盐运移的基本理论及模型应用的研究已取得长足的进步,包括水盐运移机理研究及其影响因素和数值模型研究,...

Research Progress on Water-salt Transport Theories and Models in Saline-alkali Soil

Saline-alkali land is widely distributed in China, covering more than 36 million hectares. Soil salinization has become one of the important restricting factors to the sustainable development of agriculture. The key to the saline-alkali land reclamation is to explore soil water-salt transport law. The water-salt model is the most effective way to simulate and predict their dynamic changes in farmland soil. At present, great research progresses have been made on the basic theory and model application of soil water-salt transport, including theoretical mechanisms, influencing factors and numerical models. A comprehensive analysis is helpful to clarify the current research situation of water-salt transport in saline-alkali land and would provide a reference for the saline-alkali land amendment in China. This review summarized the progress of soil water-salt transport in saline-sodic soil from the perspective of theoretical mechanisms, influencing factors and model applications, focused on the advantages, disadvantages and application effects of several commonly used water-salt models, and pointed out that the future regional/watershed scale study of water-salt models should be better combined with GIS technology.