The manuscript explores the changes in soil structure and carbon content through different cover crops, it is important for further increasing soil carbon content and improving soil structure. However, this manuscript needs be further revised and improved as shown the following issues:

1. Although different CCs were selected in this manuscript, what is the basis for selecting these CCs?
2. The role of different CCs was involved in the discussion, but this article does not provide the data of CC. Please supplement these data (such as root morphology, CC carbon type, root density, etc.) to support the discussion;
3. Please provide field management in the material method;
4. Added P values after the significant results, and delete the non-significant results to further refine the results
5. The manuscript mentions the contribution of fungi to soil structure, such as L73, L281, etc. However, the number of fungi decreases and the number of bacteria increases due to fertilization in farmland. Moreover, there is no relevant fungal data in this manuscript. Please further revise and improve;
6. The figures in the manuscript provide the replicates data, such as Figure 2, and the figures in the supporting information. It is enough to the mean with standard error in the figures. Please further modify and add statistical analysis in the figures;
7. L252-255 is the result, please move to the results parts; Further refine the discussion section;
8. L292 nuclear magnetic resonance data, not included in the manuscript, please delete it;
9. L294 mentions cellulose hemicellulose, please provide relevant data for CC;
10. Is “the strongest direct effect” in L311 significant?
11. L320 not clear;
12. Two largest fractions, which fractions?
13. Rhizosphere products and hyphae, providing data support
14. Please change the conclusion to a paragraph