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Articles by T. Gallali
Total Records ( 3 ) for T. Gallali
  N. Brahim , T. Gallali and M. Bernoux
  Sub-humid and semi-arid zones comprise a land area of about approximately 1/3 of Tunisia, good agricultural soils and major organic carbon storage are situated in this region. The objective of this study is to investigate the organic carbon distribution and stocks in soils of this region under different land uses by using different investigations: (1) The conversion from natural forest to agricultural land caused significant loss of Soil Organic Carbon (SOC) stock, it induces a decrease of SOC stock with 19.33 t C ha-1, (2) however, restoring forestry after conversion from agricultural ecosystems to forest, we found an increase of SOC stock with 0.42 t C/ha/year, (3) soil carbon sinks increase most rapidly under practice of no-tillage compared with conventional tillage, no-tillage treatment was found to increase the storage of OC in the surface layer 0-20 cm compared to conventional tillage and (4) irrigation with saline water stock higher than irrigation with freshwater only at superficial layer. Although, under this depth, irrigation with freshwater and at total profile stock higher than saline water. SOC stock is 148.5 t ha-1 in the freshwaters irrigated soils against 139.6 t ha-1 in saline water irrigated soil.
  N. Brahim , M. Bernoux , D. Blavet and T. Gallali
  This study has two aims, the first, to analyze the spatial distribution of Soil Organic Carbon (SOC) in Tunisia, second, to estimate carbon stocks for major soil types representative of Mediterranean drylands. Repartition of SOC stocks at the depth of 0.3 to 1 m were estimated for Tunisia, using a soil map combined with the results from a soil database. In addition, the total SOC stocks in the 0-30 cm and 0-100 cm soil depth were estimated for Tunisia using a digital soil map combined with results from a soil database. Tunisia contains nine main soil classes. The entire soil database totaled 1483 soil profiles corresponding to 5024 soil horizons. This dataset was built from previous analytical results published from Tunisian soil surveys (1960-2006). Most bulk density values were estimated using pedotransfer functions. Results showed that the upper soil layer 0-30 cm contains 405.44 TgC (1 Tg = 1012 g), while that in the 0-100 cm soil depth was estimated to be 1006.71 TgC. Estimates by soil types showed that the highest SOC stocks was estimated for Luvisols to 7.16 and 15.92 kgCm-2 for 0-30 cm and 0-100 cm, respectively. The lowest SOC stocks were estimated for the Lithosols to 1.84 kgCm-2 at 0-30 cm and 4.04 kgCm-2 for 0-100 cm. The soil types most representative in extension in Tunisia were the Lithosols, Regosols and the Cambisols and stocks were estimated to 73.22, 119.83 and 100.35 TgC, respectively. Tunisian SOC density in the surface layer 0-30 cm is 2.612 kgCm-2 and 6.486 kgCm-2 within the 0-100 cm depth.
  A. Bouajila and T. Gallali
  This research aimed to study the relationship between different organic matter fractions and aggregate stability in carbonated and no carbonated soils in Tunisia. Samples of soil were taken from A or Ap horizon at twelve carbonated and ten no carbonated soils. Aggregate stability was tested by Le Bissonnais method. Total soil organic carbon (SOC), particulate organic carbon (POC), hot-water-extract-polysaccharides (HWEP) and humic compounds (HC: humic acids (HA) and fulvic acids (FA)) were analysed. Both carbonated and no carbonated horizons showed high SOC and POC contents, notably under forest. While, HWEP and HC (HA and FA) contents were greater in no carbonated soils. Across all horizons, positive correlation was found between SOC and POC. Soil stability test showed that horizons were affected by fast wetting rather than mechanical breakdowns (MWDFW<MWDMB). The most stable horizon was a carbonated soil with important SOC content. However, there was a significant and positive relationship between SOC, POC and HC and aggregate stability only in no carbonated topsoil. Consequently, relationship between organic matter fractions and aggregate stability changes when soil properties vary. Accordingly, the present study may be useful to suggest practices that improve soil aggregate stability and organic matter sequestration to help retard soil loss and degradation.
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