Ecology & Safety, Volume 9, 2015

Abstract: There are analyzed soils from urbocenosis and agrocenosis from the region of municipality of Varna. There are determined macro- and microelements and their complex impact over the cellulase and the catalase activity of the soil microorganisms. The soils from the investigated ecosystems are poorly supplied with total nitrogen. The urbogenic soil is well supplied with absorbable forms of phosphorus and potassium, in contrast to the agrogenic soil, which is poorly supplied with phosphorus and averagely supplied with potassium. As per content of organic substance the urban soil is classified as a slightly humus, and that from the agrocenosis as averagely humus one. There is established that the cellulase activity is lower at the urbogenic soil in comparison with the agrogenic one. It is suppressed by the activity of Pb, Cd, Cu and Zn, but it is not influenced by the summary activity of Ni, Mn and Fe. For the enzyme catalase is marked a contrary tendency – its activity is limited by a higher content of Ni, Mn and Fe and it is not suppressed by Pb, Cd, Cu and Zn. The studied chemical and enzymatic indexes may serve as indicators for passing processes in anthropological soils with low content of heavy metals.