Structure of Microbial Complexes in Modelling of Polymetallic Pollution and Remediation of Agrosoddy-Podzolic Soils
2021
Terekhova, V. A. | Fedoseeva, E. V. | Belfeg, Ju. V. | Kiryushina, A. P. | Rychagova, A. G. | Verkhovtseva, N. V.
In a model vegetation experiment (30 days), the responses of microbial communities of agro soddy-podzolic soil of two sites (Chashnikovo, Moscow oblast) with different organic carbon content (Cₒᵣg 3.86 and 1.30%) to polymetallic pollution with heavy metals (HM) (Cu 660, Zn 1100, Pb 650 mg/kg) and treatment with biochar (5%) and lignohumate (0.25%). Classical microbiological culture-dependent analysis using Czapek agar and analysis of soil lipid profiles by gas chromatography–mass spectrometry revealed the differences in abundance colony forming units (CFUs), fungal and bacterial biomass, as well as in the diversity of cultivated fungi both in humus-rich and humus-poor soil. HMs did not have a significant effect on the number of CFUs and the number of cultural-morphological types of colonies, but reduced fungal and bacterial biomass in both soils; this decrease was more significant in a humus-poor soil. In addition, differences between the soils in the increase in the proportion of resistant melanized forms of fungi under the influence of HM in humus-rich (by 25.9%) and in humus-poor soil (by 45.7%) were observed. The sensitivity and universal significance of structural indicators as indicators of the stability of microbial complexes under chemical contamination of soils with different humus content were discussed. It was shown that the most sensitive and reliable indicators among the studied included the proportion of melanized fungi.
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