Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. XIV
Written by Bilyana GRIGOROVA-PESHEVA, Yordan IVANOV
The main objective of the study is to investigate the microbiological status of soils in beech plantations of the first and second site index. Ten soil profiles were established in ten test areas with beech plantations. The study includes an analysis of the main physico-chemical and microbiological parameters of the ten soil profiles. In each test area, the site index, relative stocking and the average volume (m3/ha) of the plantation was determined. The studied soils are of the Cambisols, Regosols and Rendzinas type. Soil samples were taken from the A and B (C) horizons. Basic indicators related to soil microorganisms were studied - humus (%), org.C mg/kg-1, pH and mechanical composition. For determination of total microbial number and the amount of individual microbiological groups (bacteria, actinomycetes and fungi), the standard method of serial dilutions and subsequent inoculation was used. The results are reported in Colony-forming unit. A horizon has a greater microbial abundance than the underlying soil horizons, regardless of the considered soil type. There are no clear dynamics in the redistribution of the percentage participation of microbial groups at depth. There is no clear correlation between the microbial abundance and site index of the plantations. The highest microbial abundance was observed at an altitude above 1300 m (TA9 and TA10). Brown forest soils stand out with the highest average biogenicity. It was found that the percentage of microscopic fungi increases in acidic soils, while their amount in Rendzinas decreases below 1.0 × 105 CFU/g dry soil.
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