Abstract
The priming effect (PE) initiated by the application of 14C-glucose was studied for copiotrophic microbial communities of organic horizons and for oligotrophic microbial communities of mineral soil horizons, as well as for mineral horizons of buried soils depleted in the input of fresh organic matter. The intensity of the PE depended on the reserves of Corg, the initial amount of the microbial biomass, and the enzymatic activity, which decreased from the organic to the mineral soil horizons. The ratio of the PE to the applied carbon was two times higher in the mineral horizons as compared with the organic horizons. This is explained by the predominance of K-strategists capable of decomposing difficultly available organic compounds in the mineral horizons, so that the turnover of the microbial biomass in the mineral horizons was more active than that in the organic horizons. The predominance of K-strategists was confirmed by the close correlation between the PE and the activity of the cellobiohydrolase enzyme decomposing cellulose (R = 0.96). In general, the absolute value of the PE was controlled by the soil organic matter content, whereas the specific PE was controlled by the functional features of the microorganisms. It was shown that the functional features of the soil microorganisms remained unchanged under the conditions of their preservation in the buried soil.
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Original Russian Text © A.I. Zhuravleva, A.S. Yakimov, V.A. Demkin, E.V. Blagodatskaya, 2012, published in Pochvovedenie, 2012, No. 4, pp. 490–499.
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Zhuravleva, A.I., Yakimov, A.S., Demkin, V.A. et al. Mineralization of soil organic matter initiated by the application of an available substrate to the profiles of surface and buried podzolic soils. Eurasian Soil Sc. 45, 435–444 (2012). https://doi.org/10.1134/S1064229312040163
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DOI: https://doi.org/10.1134/S1064229312040163