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

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

Pages : 146-154

Doi:10.18393/ejss.2016.2.146-154

View : 11 | Download : 10

Publication Date : 2016-04-02

Article Type : Research Paper

Abstract :The total soil CO 2 emission insert ignore into journalissuearticles values(EM); and portion of microbial respiration were measured insert ignore into journalissuearticles values( in situ ; May, June, July 2015); in Chernozems typical of virgin steppe, oak forest, bare fallow and urban ecosystems insert ignore into journalissuearticles values(Kursk region, Russia);. In soil samples insert ignore into journalissuearticles values(upper 10 cm layer);, the soil microbial biomass carbon insert ignore into journalissuearticles values(C mic );, basal respiration insert ignore into journalissuearticles values(BR); and fungi-to-bacteria ratio were determined and the specific microbial respiration insert ignore into journalissuearticles values(BR / C mic = q CO 2 ); was calculated. The EM was varied from 2.0 insert ignore into journalissuearticles values(fallow); to 23.2 insert ignore into journalissuearticles values(steppe); g СО 2 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 insert ignore into journalissuearticles values(by 4 and 2 times less, respectively);, while the q CO 2 of urban soil was higher insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(R 2 = 0.57);.
Keywords : Chernozems, CO2 emission, ecosystem land use, microbial biomass, microbial respiration