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

Abstract

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

Keywords

• carbon sequestration,,
• ,،,؛organic carbon stocks,,
• ,،,؛agricultural soils,,
• ,،,؛depth,,
• ,،,؛land use,,
• ,،,؛sidi bel abbés plain