Land use and Impact on Soil Organic Carbon Stock in a Semi-Arid

Atmospheric carbon sequestration in terrestrial ecosystems has become a significant challenge the global framework of reducing greenhouse gas emissions. The main objective this study is to provide estimation organic stocks agricultural soils Sidi Bel Abbes plain at various depths and according different land use, namely cereals, olives and,viticulture. We have chosen two toposequences types that dominate, Chromic Cambisols Calcareous Cambisols. Organic was determined by modified method Walkley Black. Stored values varied significantly (p <0.05) between uses depth strata. maximum value 29.28 t ha-1 ± 2.29 recorded under viticulture 30cm 45cm stratum minimum 12.11 0.17 registered cereal cultivation 0 15cm Calcaric With 15.84±3.59 as average cultivation, 19.49 ±5 olive 20.50 ±5.64 viticulture. for ranging from 15 cm; stock ha-1± 23.60 2.45. 30 15.28 1.25 27.62 3.03 45 cm 13.17 ha-1±4 .18 ha-1±4.18 .The all 54 samples 18.61 t/ha. soil 19.56 ±6 17.66 ±4