Dear Authors,

Two referees have reviewed your manuscript. They have recognized that the manuscript has values to be published in Biogeoscience. But, one of the referees suggested some critical points be revised. I agree with those reviewer's comments. Therefore, I would like to ask you to make revisions of your manuscript to address those points. I would like to ask you also to make replies to each comment point by point.

Best regards,

Nobuhito Ohte
Handling Editor

Daer Authors,

I felt that the revisions have substantially made. The reviewer has also recognized and evaluated your appropriate revisions. But, the reviewer has pointed out more few points to be improved.
Therefore, please consider and address the suggestions from the reviewer again.

Best,

Nobuhito Ohte
Handling editor


------- Comments from the reviewer ----------

I have only checked the responses to my review comments (Reviewers 1). The authors have done a good job in responding to my queries and requests but I have some additional queries.
1. P.11 L10: Soluble S or labile S may be better than water-soluble S, because CaCl2 is not just water.
2. P.11 L15-17: Although Ca2+ can depress the concentration of organic matter, it could not completely remove organic matter. That’s why you used H2O2 to remove organic matter, right? And how is HCl extraction? it does not include Ca2+.
Although below is just a suggestion, if you have the next opportunity of the experiment, it is better to apply another method, for example using a resin like DAX-8.
3. P.22 L10-11: Please add corresponding No. of figure or table. Figure 3?
4. P.22 L6: Available S concentration itself is mainly determined by soil characteristics especially amount of adsorption material. Perhaps what you want to say is a change in concentration?
5. P.22 L16-17: How does the result of the control plot support your hypothesis? The explanation is insufficient.

Dear Authors,

I feel that the manuscript has reached an acceptable level for publication in Biogeosciences. Please follow the instructions from the editorial office.
Again, thank you for submitting your manuscript to Biogeosciences, and appreciate your efforts on improving your manuscript.

Best,

Nobuhito Ohte,
Handling editor