Bulgarian Journal of Agricultural Science
Array ( [session_started] => 1756332531 [LANGUAGE] => EN [LEPTON_SESSION] => 1 )
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Analysis of some soil microbial characteristics under Picea abies (L.) Karsten stands in stage of decline
Bilyana Grigorova-Peshevaorcid, Kameliya Petrovaorcid
Abstract: The study investigated some soil microbial characteristics under Picea abies (L.) Karsten in decline. Seven soil profiles were analyzed - six under plantations in decline, and one control. The pH, humus (%), total nitrogen and C/N ratio of the soils were determined. The amounts of bacteria, actinomycetes and microscopic fungi per horizon were recorded for each soil profiles. The biogenicity of the soils was determined. The percentage participation of the microbiological groups in relation to the microbial community was analyzed. The results show significantly lower values of the microbial biota in the soils under Picea abies in decline - between three and nineteen times. The total microbial number (TMN) of the studied soils for the A horizon ranges between 12.36 -17.32*10-4(CFU/g soil), compared to the control - 44.78*10-4(CFU/g soil). The data show an atypical distribution of the microbial groups in part of the studied soil profiles. There are no correlations between soil parameters and the studied microbiological characteristics. No correlation was found between the investigated soil parameters and the (TMN). Only a weak correlation was reported between the content of humus (%) and the TMN of the Bw horizon of the studied soils (R =.62). The present study found that when growth depression occurs, we have a decline in soil microbial abundance and an atypical distribution of the participation of microbial groups in soil microbial communities. Potential relationships between growth depression in Picea abies (L.) Karsten and changes in soil microbial communities need to be further investigated.
Keywords: decline; permanent growth depression; Picea abies (L.) Karsten; soil microbial communities; soil microorganisms
Citation: Grigorova-Pesheva, B. & Petrova, K. (2025). Analysis of some soil microbial characteristics under Picea abies (L.) Karsten stands in stage of decline. Bulg. J. Agric. Sci., 31(4), 633–639.
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Date published: 2025-08-27
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