The study looked at how different types of land use affect the amount and distribution of active organic carbon in soil in a karst mountain area. They found that soil organic carbon levels were highest in bamboo land and vegetable land, and deeper soil layers had more organic carbon than shallow layers. Woodland had the highest levels of dissolved organic carbon. The percentage of dissolved organic carbon in soil increased with depth. Easily oxidized organic carbon levels matched changes in soil organic carbon levels. The study showed a strong relationship between easily oxidized organic carbon and soil organic carbon, indicating that easily oxidized carbon is influenced by changes in soil organic carbon.