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05) lower values of pH and the content of total organic carbon, basicity from soda and carbonates and higher total nitrogen and soluble salt contents. Soil microbial communities were the most vulnerable component of the disturbed arid ecosystems, as their suppressed condition was indicated by a low biochemical oxygen demand and a very low cellulase activity.Almaden, Calero, and Guadalupe reservoirs (San Jose, CA, USA) are small ( less then 13 million m3) surface water reservoirs polluted by the former New Almaden Mining District, North A