我国一些地方如华北平原,气候比较干旱,土壤水分迅速蒸发,往往引起土壤表层返盐,因此及时采取措施,保墒防盐,是这些地方农业生产中的重要问题。要保墒,就需了解土壤水分运行的规律;而盐随水行,要防盐,也需了解水分运行的规律。B.A.柯夫达曾说:“研究盐分累积过程及拟定防制盐渍化的措施时,必须了解和考 Some parts of our country, such as the North China Plain, have arid climate and rapidly evaporate soil moisture, which often causes salt return on the soil surface. Therefore, timely measures to prevent soil moisture and salt are important issues in agricultural production in these areas. To soil moisture, we need to understand the laws of soil moisture operation; and salt with water, to prevent salt, but also need to understand the laws of the operation of water. B. A. Kovadh once said: "When studying the salinity accumulation process and formulating measures to prevent salinization, we must understand and test