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Agriculture Ecosystems and Environment, N° 128. Regional carbon stocks and dynamics in native woody shrub communities of Senegal’s Peanut Basin [texte imprimé] / A. Lufafa, Auteur ; J. Bolte, Auteur ; D. Wright, Auteur ; Mamadou Khouma, Auteur ; I. Diedhiou, Auteur ; Richard P. Dick, Auteur ; F. Kizito, Auteur ; E. L Dossa, Auteur ; J.S. Noller, Auteur . - [s.d.] . - 11 p. Langues : Anglais ( eng) Catégories : | RESSOURCES NATURELLES ET ENVIRONNEMENT
| Index. décimale : | P340-Biologie et biochimie du sol | Résumé : | Estimating regional carbon (C) stocks and understanding their dynamics is crucial, both from the perspective of sustainable landscape management and global change feedback. This study combines remote sensing techniques and a coupled GIS-CENTURY model to estimate regional biomass C stocks and SOC dynamics for Guiera senegalensis shrub communities in Senegal’s Peanut Basin. A statistical model relating field-measured shrub aboveground biomass C at training plots to satellite image-derived shrub abundances was developed and used to estimate regional biomass C across a major part of the Basin.Regional SOC dynamics were modeled by coupling the CENTURY model and GIS databases. Significant correlation (r = 0.73; p = 0.05) was observed between aboveground biomass C and satellite imagederived shrub abundance at the training plots. Aboveground biomass C stocks ranged from 0.01 to
0.45 Mg ha1 with an approximate total of 247,000 Mg C for the 3060 km2 study area. CENTURY model predictions indicate that C sequestration in these systems is contingent on long-term effectiveness of non-thermal management of shrub residue and that the actual rates depend strongly on soil type and scenarios of future land management. Compared with the traditional ‘‘pruning-burned’’ management practice, returning prunings for 50 years would increase soil C sequestration by 200–350% without fertilization, and increase soil C sequestration by 270–483% under a low (35 kg ha-1 N yr-1;20 kg ha-1 P yr-1) fertilization regime, depending on soil type and climate conditions. These results
indicate that altered land management could contribute to transforming these degraded semiarid agroecosystems from a source to a sink for atmospheric CO2. |
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