Carbon dioxide emission and soil microbial respiration activity of Chernozems under anthropogenic transformation of terrestrial ecosystems

Yıl 2016, Cilt: 5 Sayı: 2, 146 - 154, 02.04.2016

Ananyeva Nadezhda D. Sofia V. Rogovaya Kristina V. Ivashchenko Vyacheslav I. Vasenev Dmitriy A. Sarzhanov Оleg V. Ryzhkov Valeriy N. Kudeyarov

https://doi.org/10.18393/ejss.2016.2.146-154

Cited By: 2

Öz

The total soil CO₂ 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 (C_mic), basal respiration (BR) and fungi-to-bacteria ratio were determined and the specific microbial respiration (BR / C_mic = qCO₂) was calculated. The EM was varied from 2.0 (fallow) to 23.2 (steppe) g СО₂ 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 C_mic 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 C_mic portion in soil С_org and С_fungi-to-С_org 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).

Anahtar Kelimeler

Chernozems, CO2 emission, ecosystem land use, microbial biomass, microbial respiration

Kaynakça

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