The study looked at how different types of land use affect the soil in the Ulan buh desert along the Yellow River. By analyzing the size of soil particles and their fractal dimensions, the researchers found that grasslands and forests have more silt and clay in their soil, while cultivated lands have more fine sand. The fractal dimension of the soil was closely related to the size of particles, with a strong positive correlation with smaller particles and a negative correlation with larger particles. This suggests that the fractal dimension can be used to evaluate how well the soil can fix sand in the study area.