Reversible conversion structure and method for soil infiltration-permeation blocking performance

The invention relates to a reversible conversion method of soil infiltration-permeation resistance, which belongs to the field of agricultural soil engineering, and comprises the following steps: firstly, obtaining artificial water-repellent soil by using a water repellent agent; and then a water vapor injection and drainage device and a soil heating device are sequentially fixed on the surface of the cultivated soil according to requirements and are simultaneously covered by water-repellent soil, and the surface of the water-repellent soil is suitable to exceed the highest position of the device by at least 2cm. When infiltration needs to be promoted, water is injected into the water-repellent soil through the water and gas injection and drainage device until water seeps out of the surface layer of the water-repellent soil. At the moment, the water repellency of the water repellency soil disappears, external water can smoothly infiltrate into the cultivated soil, and the water required by crop growth and the like is met; when evaporation prevention is needed, the water vapor injection and drainage device pumps water and starts the soil heating device at the same time, so that water in the water-repellent soil is rapidly reduced. At the moment, the water repellency of the water-repellent soil is recovered, and water loss of the cultivated soil is avoided. The process can be repeatedly realized, and the method is reversible in conversion, free of replacement, long in service cycle and capable of being applied to the fields of agricultural production, water and soil conservation and the like.