农田灌溉用水占我国水资源总消耗量的84％,而作物吸收水量的约95％消耗于蒸腾。因此,作物的水分问题是解决水资源供需平衡的十分重要的一环,成为农田水利学科中一个日益引起人们关注的问题,国内外不少学者都在探索解决这一问题的途径。而作物根系、冠层与土壤、大气的关系受着各种物理、化学和生物学机理的控制,构成了一个复杂的系统,给对它的表述与计算带来许多困难。近年发展起来的土壤——植物——大气连续体模型给解决这一问题开辟了一条可行的途径。 Farmland irrigation water accounts for 84% of China’s total water resources consumption, while about 95% of crop water consumption is consumed by transpiration. Therefore, the problem of crop moisture is a very important part to solve the balance between water supply and demand. It has become an issue that attracts more and more attention in the field of irrigation and water conservancy. Many scholars at home and abroad are exploring ways to solve this problem. The relationship between crop root system, canopy and soil and atmosphere is controlled by various physical, chemical and biological mechanisms, forming a complex system that brings with it many difficulties in its formulation and calculation. The soil-plant-atmosphere continuum model developed in recent years has opened up a feasible way to solve this problem.