Changes in the cellulolytic activity and microbial respiration of soils of different types under conditions of contamination with heavy metals

Abstract

It has been experimentally established that when soils are polluted with heavy metals, the boundary concentrations of metals above which signs of ecotoxicity are detected are different for the microbial community. Inhibition of respiration of the studied soils was observed at lower doses of Pb, Zn and Cd than enzymatic cellulase activity. Cd compounds and polyelement contamination conditions are the most toxic for microorganisms. Concentrations of heavy metals have been identified that can have a significant negative impact on the soil microbial community at different levels of contamination of sod-podzolic, gray forest, leached chernozem and chestnut soils. In descending order of resistance to TM, the studied soils can be arranged in the following row: leached chernozem (Luvic Chernozem) grey forest (Eutric Retisol (Ochric)) chestnut (Haplic Kastanozem) ≥ sod-podzolic (Eutric Albic Retisol (Ochric)).