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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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Geoderma, N° 146. Carbon stocks and patterns in native shrub communities of Senegal's Peanut Basin [texte imprimé] / A. Lufafa, Auteur ; J. Bolte, Auteur ; I. Diedhiou, Auteur ; Arona Ndiaye Samba Samba, Auteur ; M. Sène, Auteur ; Mamadou Khouma, Auteur ; F. Kizito, Auteur ; Richard P. Dick, Auteur ; E. L Dossa, Auteur ; J.S. Noller, Auteur . - [s.d.] . - 8 p. Langues : Anglais ( eng) Catégories : | RESSOURCES NATURELLES ET ENVIRONNEMENT
| Mots-clés : | Equations allométriques, Production de biomasse, Géostatistique, Guiera senegalensis, Piliostigma reticulatum, Carbone organique du sol, Tropique | Index. décimale : | P340-Biologie et biochimie du sol | Résumé : | Accurate and reliable estimates of carbon (C) storage in landscapes are critical to the development of effective policies and strategies to mitigate atmospheric and climate change. Carbon stocks of two native woody shrub (Guiera senegalensis J.F. Gmel and Piliostigma reticulatum (DC.) Hochst) communities and associated soils within Senegal's Peanut Basin were determined and the spatial structure of soil C quantified. These shrubs are of interest because they dominate semiarid sub-Sahalien Africa and commonly coexist with rowcrops but have been largely overlooked as a key vegetative component of this landscape. Peak-season shrub biomass C was measured in forty-five 0.81 ha plots at 8 locations using allometric relationships along with soil sampling (0 to 40 cm depth) and analysis for organic C and bulk density. Soil samples to a depth of 20 cm were taken every 2 m in 24×20 m grids and every 0.5 m in four nested 3 m×3 m grids containing at least one shrub or tree canopy, and geostatistical techniques were then used to quantify scale and degree of soil C spatial dependence. Estimates of peak-season biomass C ranged from 0.9 Mg C ha−1 to 1.4 Mg C ha−1 with an overall mean of 1.12 Mg C ha−1 (SEM=0.079) in the G. senegalensis sites and from 1.3 to 2.0 Mg C ha−1 (mean=1.57 Mg C ha−1; SEM=0.18) in the P. reticulatum communities. The overall mean of SOC to 40 cm was 17 and 17.2 Mg C ha−1 respectively, at the G. senegalensis and P. reticulatum sites with 57% of that C residing in the top 20 cm. Semivariograms of soil C showed moderate spatial dependence and spatial autocorrelation at distances of less than 0.56 and 1.34 m at the G. senegalensis and P. reticulatum sites, respectively. Comparison across the different grids showed that the presence of shrub canopies at either site had much closer relationship to soil C levels than trees. |
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CN1800032 | P340-LUF | Publication | CNRA/Bambey | Rayons | Exclu du prêt |
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