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CORRELATION ANALYSIS OF CH4 EMISSIONS FROM PADDY SOILS WITH CHANGES IN OXIDIZABLE ORGANIC CARBON
Autori: Jiamei Wu
Data aparitiei: Ianuarie / 2014
Revista: Environmental Engineering and Management JournalVol. 14Nr. 1
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.

Abstract
Soil organic carbon is one of the key substrates affecting methane emissions in paddy fields. However, not all soil organic carbon
forms methane. This study therefore involved comparative analysis of the methanogenesis of different organic carbon sources
(rice straw, chicken manure and pig manure) in paddy field soils. The results indicated that whereas methane emissions from the
pig manure treatment (PM) were not significantly different to those associated with the application of chemical fertilizer (CF),
methane emissions from the chicken manure (CM) and straw treatments (RS) were greater by 1.67 times (p < 0.05) and 2.69
times (p < 0.05), respectively. Soil organic carbon content exhibited the same order as methane emissions: RS > CM > PM > no
fertilizer. Correlation analysis revealed that, for different fractions of organic carbon, fraction 1 (organic carbon fraction oxidized
by 33 mmol / L KMnO4) and methane emissions were directly related. Thus, organic carbon in soil is easily oxidizable in organic
carbon fraction 1 - the primary substrate for methanogenesis. The development of effective measures to reduce the content of this
fraction may therefore represent a key method of mitigating methane emissions.



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