Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. XI
Written by Sorin MATEI, Gabi-Mirela MATEI, Elena Maria DRĂGHICI
Microorganisms are involved in biosynthesis of the exogenous compounds with role in the dynamics of edaphic processes. A variety of such biosynthesized exometabolites, such as enzymes, phenols, carbohydrates, proteins, can be released into the soil, where they undergo biochemical interactions, form precursors involved in the synthesis of complex polymers and in determining a priming effect of biogeochemical processes. The research focused on the influence induced by humic precursors, extracted from the previously selected C1-C4 consortia, on the dynamics of bioprocesses in two soil types (Albic Luvisol and Fluvisols), respectively on enzymatic activities, biomass evolution, soil respiration and nitrifying microflora. Exometabolites from the C4 consortium showed the greatest diversity and complexity as humic-like precursors, followed by those the C3 consortium. In Albic Luvisol, the qualitative differences induced by precursors from consortia are well highlighted in the fulvic acid (FA) chromatograms. Enzymatic activity, DNA content, biomass and potential respiration level were influenced differently by the precursors in the C1-C4 consortia. Qualitative and quantitative analyzes for phenols and polysaccharides showed the influence of precursors on edaphic bioprocesses, in close correlation with soil type.
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