K. S. Dushchanova, P. A. Ukrainskiy, N. N. Kashirskaya, T. E. Khomutova, A. V. Borisov
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引用次数: 0
Abstract
The biomass and functional diversity of microbial communities were studied in the watershed, transit, and accumulative positions in catenas composed of reserved gray soils (Luvic Retic Phaeozems) and chernozems (Haplic Chernozems) of the Belogorye Nature Reserve and arable variants outside the reserve. Microbial biomass was determined by the substrate-induced respiration (SIR) and the content of phospholipids. Multisubstrate testing of respiratory responses was carried out in the MicroResp system after the addition of amino acids, carboxylic acids, and carbohydrates. It was found that microbial biomass decreased in the reserved chernozem from the watershed towards the accumulative part of the slope; minimal values in the gray soil were recorded in the transit part of the catena. It was close in the plowed horizon of agrochernozems in all parts of the catena and 2–3.5 times less than in reserved chernozems. An increase in microbial biomass was recorded in the agrogray soils of the transit and accumulative parts of the catena. Cluster analysis of respiratory responses in the 0–10 and 10–20 cm layers identified two groups of the most demanded substrates. The first group in both layers included citric and ketoglutaric acids, the second group included fructose and succinic acid. Ascorbic acid, sucrose, and glutamine were included in the first group in the 0–10 cm layer and in the second group (along with asparagine and glycine) in the 10–20 cm layer. An increase in metabolic diversity was observed from the watershed to the accumulative position of the catena in all reserved and arable catenas. At the same time, plowing led to its decrease in the 0–10 cm layer: up to 1.5 times in chernozems and up to 4 times in gray soils. In the 10–20 cm layer, similar trend was observed, except for the agrogray soil in the transit part of the catena, where the number of significant responses increased 3.6 times in comparison with the reserved variant.
期刊介绍:
Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences.
Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.