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Lookup NU author(s): Caio Fernandes Zani,
Dr Elisa Lopez-Capel,
Dr Geoffrey AbbottORCiD,
Dr James Taylor,
Dr Julia Cooper
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.
For re-use rights please refer to the publisher's terms and conditions.
© 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.
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
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.
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