A new approach to estimate soil organic carbon content targets in European croplands topsoils.

Autor: Pacini L; Laboratoire de Géologie, École normale supérieure, CNRS, Université PSL, IPSL, 75005 Paris, France; Greenback SA (commercial name: Genesis), 75003 Paris, France. Electronic address: lorenza.pacini@cnrs.fr., Arbelet P; Greenback SA (commercial name: Genesis), 75003 Paris, France., Chen S; ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, China., Bacq-Labreuil A; Greenback SA (commercial name: Genesis), 75003 Paris, France., Calvaruso C; Greenback SA (commercial name: Genesis), 75003 Paris, France., Schneider F; Thünen Institute of Climate-Smart Agriculture, 38116 Braunschweig, Germany., Arrouays D; INRAE, Info&Sols Unit, 45075 Orléans, France., Saby NPA; INRAE, Info&Sols Unit, 45075 Orléans, France., Cécillon L; Laboratoire de Géologie, École normale supérieure, CNRS, Université PSL, IPSL, 75005 Paris, France., Barré P; Laboratoire de Géologie, École normale supérieure, CNRS, Université PSL, IPSL, 75005 Paris, France.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Nov 20; Vol. 900, pp. 165811. Date of Electronic Publication: 2023 Jul 26.
DOI: 10.1016/j.scitotenv.2023.165811
Abstrakt: Adopting land management practices that increase the stock of soil organic carbon (SOC) in croplands is widely promoted as a win-win strategy to enhance soil health and mitigate climate change. In this context, the definition of reference SOC content and stock values is needed to provide reliable targets to farmers, policymakers, and stakeholders. In this study, we used the LUCAS dataset to compare different methods for evaluating reference SOC content and stock values in European croplands topsoils (0-20 cm depth). Methods gave generally similar estimates although being built on very different assumptions. In the absence of an objective criterion to establish which approach is the most suitable to determine SOC reference values, we propose an ensemble modelling approach that consists in extracting the estimates using different relevant methods and retaining the median value among them. Interestingly, this approach led us to select values from the three different approaches with similar frequencies. Using estimated bulk density values, we obtained a first rough estimate of 3.5 Gt C of SOC storage potential in the cropland topsoils that we interpret as a long-term aspirational target that would be reachable only under extreme changes in agricultural practices. The use of additional methods in the ensemble modelling approach and more valid statistical spatial estimates may further refine our approach designed for the estimation of SOC reference values for croplands.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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