Abstract
For the first time studied the influence of nickel nanoparticles (Ni NPs) on the integrated index of biological activity of humus soil horizons in subboreal forest after treating with a 5.0 mg/l dispersion of nanoparticles. Adding nickel nanoparticle dispersion into the soil was carried out in filtration columns. Treatment of humus soils with Ni NPs has been established to decrease total microbial number to 50 % - 65 % in CFU, stimulate nitrification in all soil samples and a suppression of nitrogen fixation in loam soils Model tests on agar media with pure cultures of Pseudomonas fluorescens and Candida sp. showed varied sensitivity of different systematic groups to nickel nanoparticles. No positive CFU decrease of Pseudomonas fluorescens was found. However, in respect to certain concentrations of Ni NPs in an experiment with Candida sp., a marked decrease of CFU was observed.
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