Soil microbial biomass and gas-production activity (CO2) in Chernozems of different land use

Authors : Kristina Ivashchenko, Nadezhda Ananyeva, Vyacheslav Vasenev, O. Ryzhkov, V. Kudeyarov, R. Valentini

Pages : 0-0

Doi:10.21657/tsd.47684

View : 15 | Download : 5

Publication Date : 2015-01-31

Article Type : Research Paper

Abstract :The typical chernozems insert ignore into journalissuearticles values(Kursk region, Russia); in undisturbed insert ignore into journalissuearticles values(virgin and mowing steppe); and disturbed insert ignore into journalissuearticles values(pasture, black fallow, arable and including urban); ecosystems were studied. In each ecosystem and urban functional zone insert ignore into journalissuearticles values(recreational, residential and industrial); soil samples were collected in 3-5 randomly chosen locations from the depths 0-10, 10-50, 50-100 and 100-150 cm insert ignore into journalissuearticles values(total 124);. In the collected samples soil microbial biomass insert ignore into journalissuearticles values(Cmic); was analyzed by substrate-induced respiration method and basal insert ignore into journalissuearticles values(microbial); respiration insert ignore into journalissuearticles values(BR); was measured. The ratio of BR / Cmic = qCO2 and portion of Cmic in soil organic carbon insert ignore into journalissuearticles values(Corg); were estimated. In the soils insert ignore into journalissuearticles values(0-10 cm); under black fallow, arable and urban ecosystems the Cmic content and Cmic / Corg ratio were almost two times less compared to undisturbed ecosystems. Reduction of Cmic, BR and Cmic / Corg and increase of qCO2 value down the chernozem\`s profile was reported. The Cmic stocks over the chernozem\`s profile were 2-4 times higher in undisturbed ecosystems than in disturbed ones. Topsoil 10 cm contributed to the major part of the total Cmic and BR over the profile insert ignore into journalissuearticles values(41-79%);. The excess of CO2 production insert ignore into journalissuearticles values(BR); in urban soils was shown.
Keywords : Typical chernozems, soil microbial biomass carbon, soil respiration, land use