Soil aggregates play a crucial role in soil fertility and carbon storage. This study looked at how different land uses affect the distribution of organic carbon in soil aggregates in Jianghan Plain, Hubei Province. They found that fine micro-aggregates are important for storing carbon, with a significant amount of organic carbon found in the 50μm size group. Paddy fields had higher levels of active soil organic carbon compared to dryland cultivation. The 2-20μm fraction of aggregates was identified as key for retaining soil organic carbon. These findings provide insights into how soil organic carbon is stored and can help improve regional carbon sequestration efforts.