The planting of trees is inseparable from adequate soil moisture. Scientists have used root analyzers to discover that most of the source of these waters is not rainfall but is absorbed by the roots of plants. In semi-arid areas, the determinant of vegetation recovery is moisture. The content of soil moisture can be measured with a soil moisture meter. Soil moisture is the primary factor affecting vegetation restoration and reconstruction. Soil moisture supply is the limiting factor for forest growth and survival. Since the 1950s, the Sand Fixing Afforestation Research Institute of Liaoning Province has carried out large-scale artificial management of the sandy lands of northwestern Liaoning Province and has successfully built a large-scale Scotch pine compacted sand forest. This experience was rapidly followed by the local government.

However, due to the successive problems in the Pinus sylvestris plantations in recent years, the Pinus sylvestris forests have been harvested, and many abandoned lands have emerged, causing serious wind erosion and water erosion. After natural succession, these wastelands can be restored to native forests or shrubs. The combination of forest and grassland enclosure and grazing prohibition can naturally restore good ecological and environmental effects. Therefore, a dynamic study of soil moisture in sandy land aims to find out the law of soil moisture change in sandy land in northwestern Liaoning, and provide a basis for ecological restoration in the area.

Vertical Distribution of Soil Moisture in Micro-topography Due to the different spatial locations of soil profiles, the time sequence of receiving atmospheric precipitation is sequential, and is affected by infiltration, resulting in differences in the amount of rainfall received by each soil layer; the loss of soil moisture is simultaneous It is also affected by factors such as spatial location, soil hydraulic conductivity, and the absorption of soil moisture by plant roots. Therefore, the vertical distribution of soil moisture on each microtopography is different (Figure 2).

As can be seen from the figure, the vertical distribution of average soil moisture in each micro-topography varies from 180cm to less than the surface, but the basic trend is that it increases with the depth of the soil. The low surface soil moisture content is due to the fact that the sun slope receives more solar radiation and evaporates strongly. Because of the large loss of surface runoff on the natural slope, the soil water infiltration is small and the evaporation loss is large. The soil moisture in the 0) 60cm soil layer is low, and it is maintained at about 8.0%, followed by an upward trend, with the highest being 14.7%.

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