BIOREMEDIATION OF SALINE SANDY LOAM SOILS USING HALOPHYTIC FLORA IN ARID ENVIRONMENT OF WADI AL-SHATTI, LIBYA

Résumé fourni par la source

Two halophytic plant species, Ziziphus spina and Sesbania sesban, were studied for physico-chemical properties of soil through bio-reclamation. Prior to cultivation, the soil was characterized as sandy loam, highly alkaline (pH 8.89 at 0 - 30 cm), and highly saline (EC 13.15 dS/m). Both plant species demonstrated a positive impact on soil properties; however, Sesbania sesban showed superior performance. Soil porosity in the Sesbania-planted plots increased to 49.8%, while electrical conductivity (EC) was significantly reduced (7.60 dS/m). Sodium (Na+) concentrations in plant tissues increased markedly in both species. Sesbania sesban accumulated higher amounts of Na+ in shoots (958.8 mg/kg) and roots (975.5 mg/kg) compared to Ziziphus spina (858.8 mg/kg in shoots and 626.7 mg/kg in roots). Bio-reclamation indicators confirmed the superior efficiency of Sesbania sesban, which exhibited a higher Na+ uptake of 6 mg/g, a transfer factor of 1.37, and a bioaccumulation factor of 23.22. These values indicate strong salt absorption and translocation capabilities. Furthermore, the growth of Sesbania sesban improved in cultivated plots and demonstrated greater potential for reclaiming saline-affected soils due to its higher salt uptake efficiency and its positive impact on soil. Hence, the successive planting of halophytes be implemented for soil reclamation and restoration of saline soils.

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