Microbial Activity and Carbon Content in the Profiles of Modern and Buried Ancient Chernozems of Different Textures

Prikhodko, V.E.; Vasilyeva, D.I.; Li H, C.; Plaksina, A.L.; Puzanova

Авторы: Prikhodko V.E., Vasilyeva D.I., Li H Ch, Plaksina A.L., Puzanova
Журнал: Eurasian Soil Science
Том: 57
Номер: 12
Год издания: 2024
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 2134
Последняя страница: 2152
DOI: 10.1134/S1064229324602178
Аннотация: The distributions of organic matter (Corg), microbial biomass (Cmic), and basal soil respiration (BR)in the profiles of ancient (buried under kurgans 1.2, 1.8, and 4 ka ago) forest-steppe chernozems of differenttextures and their background modern analogues under pastures were studied in Chelyabinsk, Voronezh, andSamara oblasts. Twelve radiocarbon dates were obtained, including seven dates by the accelerator mass-spectrometry method. In comparison with the background surface soils, the buried soils were characterized by theCorg loss from the upper layer (0–10 cm) that reached 47, 58, and 62% in the clay loamy chernozems buried1.2, 1.8, and ~4 ka BP, respectively, and 24–40% in the loamy sandy chernozems buried ~4 ka BP. The BRand Cmic values in this layer of modern chernozems were four times higher than in the buried analogues forclay loamy soils and five–seven times higher for loamy sandy soils. In the deeper layer, these differences wereleveled out. A decrease in the Corg, BR, and Cmic of the paleosols is related to organic matter mineralizationin the absence of the input of new plant residues and the deficit of oxygen and nutrients. In the buried soils,the stratification of Сorg and Сmic distribution became less pronounced downward the soil profile. The valuesof Cmic and BR in the layer of 0–20 cm reached 70% of their total sum in the layer of 0–50 cm in the modernclay loamy chernozems and 50–60% in the modern loamy sandy chernozems and in the buried chernozems.The percent of Cmic in Corg gained maximum in the layer of 0–10 cm in the modern clay loamy chernozems:1.6–3.0% versus 0.3–1.1% in the other soils. The BR/Cmic ratio was close in the modern and buried soils; itwas the highest in the loamy sandy chernozems attesting to a higher deficit of available Corg for microbes. Thiswas also indicated by the fact that the ancient chernozems buried 1.2, 1.8, and ~4 ka BP had close Cmic andBR values to a depth of 60 cm regardless of the soil texture, except for loamy sandy varieties. The coefficientsof variation in the upper 10 cm were 9–15% for Сorg, 8–19% for BR, and 13–31% for Сmic. They slightlyincreased down the soil profile. There was a significant correlation between the microbiological parametersand the Сorg content (r = 0.54–0.97) in all the studied soils.
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Microbial Activity and Carbon Content in the Profiles of Modern and Buried Ancient Chernozems of Different Texturesстатья

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