Long-term effect of contrasted tillage and crop management on soilcarbon dynamics during 41 years

Dimassi, B. and Mary, B. and Wylleman, R. and et al, . (2014) Long-term effect of contrasted tillage and crop management on soilcarbon dynamics during 41 years. Agriculture, Ecosystems and Environment, 188. pp. 134-146.

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Although numerous studies have been conducted on the effect of tillage on soil organic carbon (SOC),there is still no consensus on the importance of sequestration which can be expected from reduced tillage.Most studies have used a synchronic approach in fields or long-term experiments which were often poorlycharacterized with respect to initial conditions. In this paper, we used a diachronic approach to quan-tify SOC changes in a 41 years experiment comparing no-till (NT), shallow till (ST) and full inversiontillage (FIT) combined with crop managements (residues removal, rotation and catch crops). It includedSOC measurements at time 0 and every 4 years, calculations at equivalent soil mass within or belowthe old ploughed layer. Results show that tillage or crop management had no significant effect on SOCstocks after 41 years both in the old ploughed layer (ca. 0–28 cm) and deeper (ca. 0–58 cm). Tillagehad no effect on crop yields and residues. In the reduced tillage treatments (ST and NT), SOC accu-mulated in the surface layer (0–10 cm), reaching a plateau after 24 years but declined continuously inthe lower layer (10–28 cm) at a rate of 0.42–0.44% yr−1. The difference in SOC stocks (ST or NT minusFIT) over the old ploughed layer followed a non-monotonic pattern over time. Reduced tillage caused arapid SOC sequestration during the first 4 years which remained more or less constant (mean = 2.17 and1.31 t ha−1, resp.) during the next 24 years and disappeared after 28 years. The drop was attributed tothe higher water balance recorded during years 24–28. In the reduced tillage treatments, the changes inSOC over time were negatively correlated with the water balance, indicating that sequestration rate waspositive in dry periods and negative in wet conditions. This study highlights the interest of diachronicapproaches to understand the effect of tillage and its interaction with environmental and managementfactors.

Item Type: Article
Additional Information: This study has been made possible thanks to the financial sup-port of Arvalis-Institut du Vegetal and ANRT... Supplementary data associated with this article can be found, inthe online version, at http://dx.doi.org/10.1016/j.agee.2014.02.014.
Uncontrolled Keywords: Soil organic carbon, SOC, Long-term, Dynamics, Crop management, Crop production, Tillage
Author Affiliation: INRA, UPR AgroImpact, Site de Laon, Pôle du Griffon, 02000 Barenton-Bugny, France
Subjects: Plant Production
Soil Science and Microbiology > Soil Sciences
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 20 Mar 2014 10:21
Last Modified: 20 Mar 2014 10:21
Official URL: http://dx.doi.org/10.1016/j.agee.2014.02.014
URI: http://eprints.icrisat.ac.in/id/eprint/12924

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