1Biogeochemistry laboratory in desert environments. Kasdi Merbah University. BP 511, 30000. Ouargla. Algeria.
2Faculty of natural and life sciences, El oued University BP 789. 39000. Algeria.
3Protection laboratory of ecosystem in arid and semi arid zone. Kasdi Merbah University. BP 511, 30000. Ouargla. Algeria.
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