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Organic material types have stronger effects on humic substances and enzyme activities than soil types
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  • Shengai Jin,
  • Long Jia,
  • Xinwei Liu,
  • Qaiser Hussain,
  • Xiangyun Song,
  • Liqiang Cui,
  • Chengji Wang,
  • Dejie Cui
Shengai Jin
Qingdao Agricultural University

Corresponding Author:[email protected]

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Long Jia
Qingdao Agricultural University
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Xinwei Liu
Qingdao Agricultural University
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Qaiser Hussain
PMAS-AAUR
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Xiangyun Song
Qingdao Agricultural University
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Liqiang Cui
Yancheng Institute of Technology
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Chengji Wang
Fujian Academy of Agricultural Sciences
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Dejie Cui
Qingdao Agricultural University
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Abstract

Organic materials are essential to increase soil organic carbon (SOC). However, it is unclear whether C sequestration is primarily affected by the form of organic materials or soil types. Wheat straw, tobacco straw, and their derived biochars were added to acidic soil, saline soil and calcareous soil in the same C concentration and incubated for 30, 90, and 180 days, respectively. The contents of humic substances (HS), the structural characteristic of SOC, and enzyme activities were investigated. The results revealed that both biochar-C and crop straw-C were mainly sequestered in humin (HU) across all soil types. Moreover, humic acid (HA) levels increased in straw treatments but not in biochar treatments. The cluster analysis and principal components analysis showed that HU had a significantly positive correlation with SOC. The aryl C of SOC increased in biochar treatments, while phenolic C and O-alkyl C of SOC increased in straw treatments. A positive correlation was found between aromatic C and SOC concentration, as well as between polyphenol oxidase activity and O-alkyl C. The formation of O-alkyl C was affected by polyphenol oxidase activity. These findings suggest that the form of organic materials and microbial activity, rather than soil types, influence the formation of HS and functional groups of SOC. Soil amended with biochar can sequester more recalcitrant C while also increasing the hydrophobicity of SOC.
17 Jul 2021Submitted to Land Degradation & Development
19 Jul 2021Submission Checks Completed
19 Jul 2021Assigned to Editor
20 Jul 2021Review(s) Completed, Editorial Evaluation Pending
07 Feb 20221st Revision Received
14 Feb 2022Submission Checks Completed
14 Feb 2022Assigned to Editor
20 Feb 2022Review(s) Completed, Editorial Evaluation Pending
20 Feb 2022Editorial Decision: Revise Minor
16 Mar 20222nd Revision Received
17 Mar 2022Submission Checks Completed
17 Mar 2022Assigned to Editor
20 Mar 2022Review(s) Completed, Editorial Evaluation Pending
20 Mar 2022Editorial Decision: Revise Minor
23 Mar 20223rd Revision Received
24 Mar 2022Submission Checks Completed
24 Mar 2022Assigned to Editor
25 Mar 2022Review(s) Completed, Editorial Evaluation Pending
27 Mar 2022Editorial Decision: Revise Minor
05 Apr 20224th Revision Received
06 Apr 2022Submission Checks Completed
06 Apr 2022Assigned to Editor
10 Apr 2022Review(s) Completed, Editorial Evaluation Pending
10 Apr 2022Editorial Decision: Revise Minor
18 Apr 20225th Revision Received
21 Apr 2022Submission Checks Completed
21 Apr 2022Assigned to Editor
23 Apr 2022Review(s) Completed, Editorial Evaluation Pending
23 Apr 2022Editorial Decision: Accept