Mechanisms of soil organic carbon stability and its response to no-till : A global synthesis and perspective

© 2021 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 28(2022), 3 vom: 06. Feb., Seite 693-710
1. Verfasser: Kan, Zheng-Rong (VerfasserIn)
Weitere Verfasser: Liu, Wen-Xuan, Liu, Wen-Sheng, Lal, Rattan, Dang, Yash Pal, Zhao, Xin, Zhang, Hai-Lin
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Review microbial activity physicochemical protection priming effects soil organic matter soil structure tillage practices Soil Carbon 7440-44-0
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520 |a Mechanisms of soil organic carbon (SOC) stabilization have been widely studied due to their relevance in the global carbon cycle. No-till (NT) has been frequently adopted to sequester SOC; however, limited information is available regarding whether sequestered SOC will be stabilized for long term. Thus, we reviewed the mechanisms affecting SOC stability in NT systems, including the priming effects (PE), molecular structure of SOC, aggregate protection, association with soil minerals, microbial properties, and environmental effects. Although a more steady-state molecular structure of SOC is observed in NT compared with conventional tillage (CT), SOC stability may depend more on physical and chemical protection. On average, NT improves macro-aggregation by 32.7%, and lowers SOC mineralization in macro-aggregates compared with CT. Chemical protection is also important due to the direct adsorption of organic molecules and the enhancement of aggregation by soil minerals. Higher microbial activity in NT could also produce binding agents to promote aggregation and the formation of metal-oxidant organic complexes. Thus, microbial residues could be stabilized in soils over the long term through their attachment to mineral surfaces and entrapment of aggregates under NT. On average, NT reduces SOC mineralization by 18.8% and PE intensities after fresh carbon inputs by 21.0% compared with CT (p < .05). Although higher temperature sensitivity (Q10 ) is observed in NT due to greater Q10 in macro-aggregates, an increase of soil moisture regime in NT could potentially constrain the improvement of Q10 . This review improves process-based understanding of the physical and chemical mechanism of protection that can act, independently or interactively, to enhance SOC preservation. It is concluded that SOC sequestered in NT systems is likely to be stabilized over the long term 
650 4 |a Journal Article 
650 4 |a Review 
650 4 |a microbial activity 
650 4 |a physicochemical protection 
650 4 |a priming effects 
650 4 |a soil organic matter 
650 4 |a soil structure 
650 4 |a tillage practices 
650 7 |a Soil  |2 NLM 
650 7 |a Carbon  |2 NLM 
650 7 |a 7440-44-0  |2 NLM 
700 1 |a Liu, Wen-Xuan  |e verfasserin  |4 aut 
700 1 |a Liu, Wen-Sheng  |e verfasserin  |4 aut 
700 1 |a Lal, Rattan  |e verfasserin  |4 aut 
700 1 |a Dang, Yash Pal  |e verfasserin  |4 aut 
700 1 |a Zhao, Xin  |e verfasserin  |4 aut 
700 1 |a Zhang, Hai-Lin  |e verfasserin  |4 aut 
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773 1 8 |g volume:28  |g year:2022  |g number:3  |g day:06  |g month:02  |g pages:693-710 
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