Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Carbon sequestration due to the abandonment of agriculture in the former USSR since 1990

Abstract : The end of the Soviet Union and the collapse of its agricultural structures in the early 1990s has induced the abandonment of a large croplands area, which have been recovered by herbaceous plants. This widespread unintended and abrupt land use change took place over 200,000 km(2), a large enough scale to impact the continental and global carbon budgets. The goal of this study is to estimate the net biome productivity (NBP) of the abandoned croplands and to assess the soil C storage dynamics due to recent land conversion. The soil C balance and its input (net primary productivity) and output (heterotrophic respiration) fluxes is simulated in a spatially explicit manner with the process-driven natural vegetation/crop model Organizing Carbon and Hydrology in Dynamic Ecosystems-Supra-Thermal Ion Composion Spectrometer prescribed with successive area changes of abandoned croplands during the 1990s. We estimate that regional agricultural abandonment is responsible of a cumulated carbon sink over 1991 2000 of 373 gC m(-2), or 64 TgC over the domain considered, which defines a mean annual C sink of 46.7 g C m(-2) a(-1). Agricultural practices during the former cultivation phase determine a legacy on the C sink following abandonment, which impacts by +37% to -25% according to the practice considered (no tillage, no fertilization, and export of some crop residues). We conclude that futures studies of this regional change in the C cycle should better consider management information in order to refine the NBP estimate.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [27 références]  Voir  Masquer  Télécharger

https://hal-enpc.archives-ouvertes.fr/hal-00716544
Contributeur : Ist Enpc <>
Soumis le : mercredi 28 octobre 2020 - 15:56:14
Dernière modification le : samedi 31 octobre 2020 - 03:08:01

Fichier

192c02b08ec6ab9fbc2f2e753ad596...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Nicolas Vuichard, Philippe Ciais, Luca Belelli, Pascale Smith, Riccardo Valentini. Carbon sequestration due to the abandonment of agriculture in the former USSR since 1990. Global Biogeochemical Cycles, American Geophysical Union, 2008, 22 (4), pp.GB4018. ⟨10.1029/2008GB003212⟩. ⟨hal-00716544⟩

Partager

Métriques

Consultations de la notice

898

Téléchargements de fichiers

119