The study looked at how soil erosion affects the ability of soil to hold water in northeastern China. They collected samples of lightly and severely eroded black soil from 15 sites and measured the water content at different levels of suction. By using a model called Van Genuchten, they found that the parameters of the model differed between the two types of eroded soil. They also compared different input sets for the model and found that one set, including sand, silt, clay percentages, and water content at specific suctions, gave more accurate results. The study suggests that modifying certain parameters in the model can improve its accuracy in predicting soil water content.