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Effects of integrating grass-clover leys with livestock into arable crop rotations on soil carbon stocks and particulate and mineral-associated soil organic matter fractions in conventional and organic systems

Lookup NU author(s): Caio Fernandes Zani, Dr Elisa Lopez-Capel, Dr Geoffrey AbbottORCiD, Dr James Taylor, Dr Julia Cooper

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by John Wiley and Sons Inc., 2022.

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Abstract

© 2021 British Society of Soil Science. Organic systems, integrated crop–livestock systems (ICL) and leys are posited as strategies to increase soil carbon (C) stocks. However, previous studies have: (i) only considered one driver of change; (ii) evaluated soil C content instead of stocks; (iii) been limited to the 0.20 m depth; (iv) used short-term leys; and (v) rarely assessed the distribution of C among soil organic matter (SOM) fractions, which relates to C stabilization. The aim of this study was to investigate the impact of conventional vs. organic agricultural systems, grazing regimes (non-grazed vs. grazed) and different proportions of temporary grass-clover leys in crop rotations (ley time proportion – LTP) on soil C stocks and C distribution among SOM fractions down to 0.60 m soil depth. SOM fractions assessed were particulate organic matter (POM > 53 μm), heavy fraction (HF > 53 μm) and mineral-associated silt and clay fraction (SC < 53 μm). There were no differences in soil C stocks between the conventional and the organic system, but the former had higher SC-C in the 0.15 m depth. Increasing the LTP associated with livestock grazing increased: (a) soil C stocks in the topsoil (0.30 m); and (b) POM-C and HF-C in the 0.15 m and POM-C in the 0.30–0.60 m depth under both agricultural systems. The inclusion of the longer grazed grass-clover leys was especially important for topsoil POM-C and HF-C under the conventional system. These results suggest that ICL systems with increasing LTP in crop rotations can play an important role in achieving a net C benefit.


Publication metadata

Author(s): Fernandes Zani C, Lopez-Capel E, Abbott GD, Taylor JA, Cooper JM

Publication type: Article

Publication status: Published

Journal: Soil Use and Management

Year: 2022

Volume: 38

Issue: 1

Pages: 448-465

Print publication date: 01/01/2022

Online publication date: 14/08/2021

Acceptance date: 11/08/2021

Date deposited: 12/10/2021

ISSN (print): 0266-0032

ISSN (electronic): 1475-2743

Publisher: John Wiley and Sons Inc.

URL: https://doi.org/10.1111/sum.12754

DOI: 10.1111/sum.12754


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