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Multi-criteria spatialization of soil organic carbon sequestration potential from agricultural intensification in Senegal

Domaine de recherche: Uncategorized Année: 2010
Type de publication: Article
Auteurs:
  • V. Bellassen
  • R. J. Manlay
  • J. P. Chery
  • V. Gitz
  • A. Toure
  • M. Bernoux
  • J. -L. Chotte
Journal: Climatic Change Volume: 98
Nombre: 1-2 Pages: 213-243
Note:
98(1-2) Current Contents(R)/Agriculture, Biology & Environmental Sciences Current Contents(R)/Physical, Chemical & Earth Sciences. Reprint available from: Bellassen V LSCE Orme Bat 712 F-91191 Gif Sur Yvette France LSCE Orme F-91191 Gif Sur Yvette France IRD, UMR Eco&Sols Montpellier France AgroParisTech ENGREF, Ecole Natl Genie Rural Eaux & Forets Montpellier France Ctr Cooperat Int Rech Agron Dev CIRAD, UMR TETIS Montpellier France Ctr Natl Machinisme Agr Genie Rural Eaux & Forets, UMR TETIS Montpellier France Ctr Cooperat Int Rech Agron Dev CIRAD, UMR CIRED Nogent Sur Marne France CSE Dakar Senegal
Résumé:
On the eve of the 15th climate negotiations conference in Copenhagen, the pressure to assess all climate mitigation options is mounting. In this study, a bio-physic model and a socio-economic model were designed and coupled to assess the carbon sequestration potential of agricultural intensification in Senegal. The biophysical model is a multiple linear regression, calibrated and tested on a dataset of long-term agricultural trials established in West Africa. The socio-economic model integrates both financial and environmental costs related to considered practice changes. Both models are spatially explicit and the resulting spatial patterns were computed and displayed over Senegal with a geographic information system. The national potential from large-scale intensification was assessed at 0.65-0.83 MtC. With regards to local-scaled intensification as local projects, the most profitable areas were identified in agricultural expansion regions (especially Casamance), while the areas that meet the current financial additionality criteria of the Clean Development Mechanism were located in the northern part of the Peanut Basin. Using the current relevant mode of carbon valuation (Certified Emission Reductions), environmental benefits are small compared to financial benefits. This picture is radically changed if "avoided deforestation", a likely consequence of agricultural intensification, is accounted for as the greenhouse gases sink capacity of projects increases by an average of a hundred-fold over Senegal. [References: 98]