No tillage increases soil organic carbon storage and decreases carbon dioxide emission in the crop residue-returned farming system

Journal of Environmental Management
Hao WangXiaoli Wang

Abstract

Soil organic carbon (SOC) storage and carbon dioxide (CO2) emission under different tillage methods in a crop residue-returned farming system may not be consistent with result from studies of the usual tillage researches because crop residues are important carbon sources with significant effects on soil carbon input and output. Herein, we address a knowledge gap over the "hot spot" research on tillage practices on SOC storage and CO2 emission in crop residue-returned farming systems. In this study, a long-term (2007-2019) field experiment was conducted, and the crop residues were returned to the soil after harvest; then, three tillage methods were conducted: no tillage (NT), subsoiling tillage (ST), and a moldboard plow tillage (CT). Our results showed that in the crop residue-returned farming system, NT and ST still showed advantages of lower CO2 flux compared with CT, as well as a reduced average CO2 flux of 14.5% and 8.5%, respectively, over a two-year average. The results of our long-term study suggest that the NT had advantages of SOC accumulation. In addition, as of June 2018, NT increased SOC stocks with 5.85 Mg hm-2 at a 0-60-cm soil depth compared with CT, whereas no significant difference was found between ST and CT. ...Continue Reading

References

Apr 27, 2007·The Science of the Total Environment·Julian J C Dawson, Pete Smith
Oct 8, 2011·Nature·Michael W I SchmidtSusan E Trumbore
Nov 23, 2011·Proceedings of the National Academy of Sciences of the United States of America·David TilmanBelinda L Befort
Oct 29, 2017·Proceedings of the National Academy of Sciences of the United States of America·Bronson W GriscomJoseph Fargione

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Citations

May 12, 2021·Journal of Environmental Management·Xiaoxiao LiFu Chen

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