[en] Widespread adoption of conservation practices is increasingly encouraged to improve soil organic carbon (SOC) storage and mitigate climate change. However, soil texture and mineralogy cause variable SOC responses under conservation tillage. The role of minerals and organic carbon composition in soil aggregation and SOC stabilization remains insufficiently understood. This study evaluated the long-term effects of conservation tillage (no-tillage with straw return, NTS) versus conventional tillage (plough tillage with straw removal, CT) on carbon storage across Phaeozems, Calcaric Cambisols, and Calcic Luvisols. Compared to CT, NTS increased the annual average C sequestration rate by 15.3%–76.7% and SOC storage by 10.2%–28.4% in different soil types. NTS also increased macroaggregate percentage and mean weight diameter (MWD), resulting in 17.8%–28.3% larger macroaggregate-associated SOC and total nitrogen (TN) contents. Notably, the aromatic-C/aliphatic-C ratio under NTS increased in bulk soil and macroaggregates, which were positively correlated with larger amorphous iron (Feo) content, Ca2+ concentration, and specific surface area in different treatments. Phaeozems exhibit the largest SOC storage, along with larger Feo and Ca2+ contents and aromatic-C/aliphatic-C ratio. However, NTS led to the greatest increases in MWD and SOC storage in Calcaric Cambisols, and the greatest enhancement of microbial biomass carbon in Calcic Luvisols. PLS-PM analysis indicated that although the aromatic-C/aliphatic ratio directly enhances aggregated stability, Feo and Ca2+ promoted MWD indirectly by facilitating greater aromatic-C and polysaccharide-C. Overall, conservation tillage promoted selective binding of Feo and Ca2+ to SOC functional groups, thus enhancing soil aggregation and SOC physico-chemical protection, with calcareous soils showing a stronger response.
Disciplines :
Agriculture & agronomy
Author, co-author :
Han, Zixuan ; Université de Liège - ULiège > TERRA Research Centre ; State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China (The Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, China
Degré, Aurore ; Université de Liège - ULiège > TERRA Research Centre > Echanges Eau - Sol - Plantes
Li, Shengping ; State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China (The Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, China
Song, Xiaojun; Institute of Agricultural Resources and Environment, Xinjiang Academy of Agricultural Sciences, Ürümqi, China
Gao, Huizhou; State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China (The Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, China
Jia, Angyuan; State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China (The Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, China
Gao, Qiqi; State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China (The Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, China
Wu, Xueping ; State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China (The Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, China
Liang, Aizhen; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China
Language :
English
Title :
Conservation Tillage Increases Carbon Storage by Regulating Mineral-Mediated Aggregate Stability and Carbon Chemistry
Funding: This work was supported by National Key Research and Development Program of China (2023YFD1500301). This work was financially supported by the National Key Research and Development Program of China (2023YFD1500301). The authors thank researchers at the station of Northeast Institute of Geography and Agroecology for their help maintaining the field experiments. The authors would like to express sincere gratitude to the professors from the University of Li\u00E8ge for their valuable suggestions and thank TopEdit (www.topeditsci.com) for its linguistic assistance during the preparation of this manuscript. We also thank the editors for their efforts.This work was financially supported by the National Key Research and Development Program of China (2023YFD1500301). The authors thank researchers at the station of Northeast Institute of Geography and Agroecology for their help maintaining the field experiments. The authors would like to express sincere gratitude to the professors from the University of Li\u00E8ge for their valuable suggestions and thank TopEdit ( www.topeditsci.com ) for its linguistic assistance during the preparation of this manuscript. We also thank the editors for their efforts.
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