الفهرس 
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Abstract
Alkaline environments can be placed into several broad categories on the process generating alkalinity all depend on a continuous process either microbial or chemical to maintain an alkaline ph and counter the buffering effect of co 2 which at a marcroscale tend to maintain more a neutral or acidic ph jones et al soil microbial processes such as ammonification and sulfate reduction rarely lead to stable phs in the excess ofph 10 and may be transient and localized unless unrestricted by facctors such as nutrient supply.