The study looked at how soil organic carbon (SOC) varies in a farming-pastoral area. They collected soil samples from different depths and locations, finding that SOC levels were lower in the center of the area and decreased with depth. The highest variability in SOC was in the top soil layer, especially in areas with more human activity. As you dig deeper into the soil, the differences in SOC levels become less pronounced. Different models were used to predict SOC levels at different depths, showing that SOC distribution varied a lot within the same depth zone.