RESULTS OF ATMOSPHERIC CHEMISTRY INVESTIGATIONS OF N2O AND СH4 GREENHOUSE GASES
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2014, Vol 19, Issue 3
Abstract
The object of this study was the surface layer of atmosphere over typical arable lands (southern chernozems) of the South of Ukraine. The subject of this study was soil-atmosphere exchange of N2O and CH4 greenhouse gases. The aim of this article was to investigate of N2O and CH4 fluxes between soil-atmosphere and determinate the main constituents of exchange processes (emission and consumption) of these gases on southern chernozem soils in 2009 – 2010.Three automatic soil chamber systems for inert gas monitoring by accumulation (SIGMA) were used for air sampling. Fortnightly or monthly samples were analyzed by gas chromatography with ECD and FID detectors.It has been shown that soil-atmosphere exchange of N2O in that region was affected by both agricultural activity and climatic condition. Annual budget for N2O has been calculated and was 215±123 g N ha-1 in 2010. For the first time a fertilizer-induced emission factor (EF) of N2O for southern chernozems has been estimated. It is noteworthy that EF for N2O was 4 times less than IPCC recommended one. Simultaneously it has been found that southern back soils were ‘consumers’ for CH4 to a great extent in 2010 with annual CH4 budget around -208±511 g С ha-1.According to our findings, southern chernozem croplands can be considered as a small source for N2O with 0.27 % EF only, but a small sink for CH4.
Authors and Affiliations
S. V. Medinets
Keywords
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