The study looked at how soil erosion and deposition affect soil organic carbon levels on mountain slopes in karst areas. They found that soil organic carbon content was higher on natural slopes compared to wasteland slopes, and decreased with slope gradient. The type of plants present also influenced soil organic carbon levels. The researchers observed that the loss of new carbon was greater on wasteland slopes. The depth of the soil profile also showed differences in carbon content and isotopic composition, reflecting plant residue input and carbon accumulation on the slopes.