1. Carbon dioxide emission and soil microbial respiration activity of Chernozems under anthropogenic transformation of terrestrial ecosystems.
- Author
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Ananyeva, Nadezhda D., Rogovaya, Sofia V., Ivashchenko, Kristina V., Vasenev, Vyacheslav I., Sarzhanov, Dmitriy A., Ryzhkov, Oleg V., and Kudeyarov, Valeriy N.
- Subjects
CARBON dioxide mitigation ,SOIL microbial ecology ,CHERNOZEM soils - Abstract
The total soil CO
2 emission (EM) and portion of microbial respiration were measured (in situ; May, June, July 2015) in Chernozems typical of virgin steppe, oak forest, bare fallow and urban ecosystems (Kursk region, Russia). In soil samples (upper 10 cm layer), the soil microbial biomass carbon (Cmic ), basal respiration (BR) and fungi-tobacteria ratio were determined and the specific microbial respiration (BR / Cmic = qCO2 ) was calculated. The EM was varied from 2.0 (fallow) to 23.2 (steppe) g CO2 m-2 d-1 . The portion of microbial respiration in EM was reached in average 83, 51 and 60% for forest, steppe and urban, respectively. The soil Cmic and BR were decreased along a gradient of ecosystems transformation (by 4 and 2 times less, respectively), while the qCO2 of urban soil was higher (in average by 42%) compared to steppe, forest and fallow. In urban soil the Cmic portion in soil Corg and Cfungi -to-Corg ratio were by 2.6 and 2.4 times less than those for steppe. The relationship between microbial respiration and BR values in Chernozems of various ecosystems was significant (R² = 0.57). [ABSTRACT FROM AUTHOR]- Published
- 2016
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