Nature of Inner Asia
Bibliographic description:
, INVESTIGATION OF THE INTENSITY OF ORGANIC MATTER MICROBIAL DECOMPOSITION IN ARID STEPPE SOILS OF SOUTH-WESTERN TRANSBAIKAL BY APPLICATION METHODS // Nature of Inner Asia. - 2018. №3(8). . - С. 28-37.
Title:
INVESTIGATION OF THE INTENSITY OF ORGANIC MATTER MICROBIAL DECOMPOSITION IN ARID STEPPE SOILS OF SOUTH-WESTERN TRANSBAIKAL BY APPLICATION METHODS
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To assess the effect of climatic factors on the enzymatic (protease and cellulase) activity of microbial communities, we studied the intensity of model substrates (cellulose and pro- tein) decomposition under field conditions. The highest intensity of model substrates de- composition was observed in 2016 — the period of favorable hydrothermal conditions: the average annual rate for protein and cellulose was 0.095– 0.169 and 0.032–0.045% per day respectively. In more dry 2015, the lowest indices of their decomposition were 0.022–
0.082 and 0.008–0.023% per day, respectively. Depending on the climatic conditions of South-Western Transbaikal, we noted certain common features of model substrates de- composition in different periods of the research. In the summer-autumn period hydro- thermal indices was more favorable for activity of microorganisms (the optimum tempera- tures coincided with the highest moisture content): the decomposition rate of protein and cellulose was 0.051–0.520% per day and 0.014–0.110% per day respectively.
We highlighted the low actual cellulolytic activity (0.001–0.160% per day) of the investi- gated soils, despite the relatively high potential of their cellulolytic ability (0.18–1.34% per day). Higher rates of canvas decomposition in the open environment were observed in underhumus horizons of the investigated soils, which are less prone to aridization and in- solation.
0.082 and 0.008–0.023% per day, respectively. Depending on the climatic conditions of South-Western Transbaikal, we noted certain common features of model substrates de- composition in different periods of the research. In the summer-autumn period hydro- thermal indices was more favorable for activity of microorganisms (the optimum tempera- tures coincided with the highest moisture content): the decomposition rate of protein and cellulose was 0.051–0.520% per day and 0.014–0.110% per day respectively.
We highlighted the low actual cellulolytic activity (0.001–0.160% per day) of the investi- gated soils, despite the relatively high potential of their cellulolytic ability (0.18–1.34% per day). Higher rates of canvas decomposition in the open environment were observed in underhumus horizons of the investigated soils, which are less prone to aridization and in- solation.
Keywords:
microbial decomposition; arid steppe soils; application methods; cellulolytic soil activity.
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