Scientific journal
Scientific Review. Biological science
ISSN 2500-3399
ПИ №ФС77-57454

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ANALYSIS OF MAJOR FACTORS INFLUENCING SOIL CARBON DIOXIDE EMISSIONS IN CHERNOZEMS OF THE STRELETSKI STEPPE

Tembo A. 1 Samardjic M. 1 Vasenev V.I. 1, 2 Ryzhkov O.V. 3 Morev D.V. 1 Vasenev I.I. 1
1 Laboratory of agroecological monitoring
2 Agricultural faculty
3 The Central Chernozem State Biosphere Nature Reserve named in honour of prof. V.V. Alekhin
Results of ecological monitoring research work on carbon dioxide (CO2) emissions from terrestrial ecosystems of the Streletski steppe in Central Chernozem Reserve are presented in this paper. The research was carried out on 6 representative ecosystems with five replicas from May to July 2013 for the purpose of analyzing the major factors influencing CO2 emissions from soils under different ecological conditions. Measurements of CO2 were carried out in-situ by means of infra red (IR) gas analyzer - Li 820, with simultaneous measurements of soil temperature (Check Temp sensor) and soil moisture (SM300 sensor). Results of the study showed the highest CO2 emissions in a forest ecosystem with an average value of 39.5 g CO2 m-2 day-1. The lowest emissions were observed on fallow land which recorded an average of 8.1 g CO2 m-2 day-1. The results also showed a variation of CO2 fluxes among and within ecosystems. Coefficient of variation (CV) in forest ecosystem and fallow land where the highest and lowest fluxes were recorded was 34% and 42%, respectively. The highest spatial variability was noted on Non-Mowed steppe, with a value of 64% that represented 36 and 28% higher than on 10-year-old mowed steppe and 5-year-old mowed steppe respectively and 24% more than on pasture The main factors influencing the variability of CO2 emissions in the studied ecosystems were land use, temperature and soil moisture. Land use accounted for 65% of the total variance analysis (ANOVA, p <0.05). CO2 emission coefficient of correlation with temperature and soil moisture was -0.92 and 0.75, respectively.