title: Evaluating changes in cellulolytic bacterial population to explain methane emissions from air-dried and composted manure treated rice paddy soils.
abstract: Compost application recorded ~20% reduction in methane (CH4) emission during rice cultivation as compared to air-dried manure treatment. The objective of this study was to evaluate the dependence of methanogens on cellulolytic bacteria (CB) to produce CH4 in organic-amended rice paddy soils. The presence of more decomposable organic C in manure was probably the key factor for higher CH4 emission from manure-treated soils as compared to compost application. Manure application facilitated anaerobic CB abundance in rice paddy soils, and that in turn increased concentrations of dissolved organic C compounds like carbohydrates in soil. Soluble organic C compounds are converted into acetate and/or carbon dioxide, which act as initial energy source for methanogens. Therefore, it could be concluded that CB positively influenced methanogen activity and methanogenesis and stabilized organic substrates like compost are more rational treatment to mitigate CH4 emission from rice paddy soil than cattle manure application.
authors.affiliation: Division of Applied Life Science, Gyeongsang National University, Jinju 660701, South Korea. Electronic address: prabhat2003@gmail.com.
authors.forename: Prabhat
authors.initials: P
authors.lastname: Pramanik
authors.affiliation: Division of Applied Life Science, Gyeongsang National University, Jinju 660701, South Korea. Electronic address: pjkim0303@gmail.com.
authors.forename: Pil Joo
authors.initials: PJ
authors.lastname: Kim
mesh_terms: D000383:Agriculture / Q000379:methods*; D000393:Air Pollutants / Q000032:analysis*; D001419:Bacteria / Q000254:growth & development / Q000378:metabolism*; D002482:Cellulose / Q000378:metabolism; D005308:Fertilizers; D008372:Manure; D008697:Methane / Q000032:analysis; D012275:Oryza / Q000254:growth & development; D012037:Refuse Disposal / Q000379:methods; D012987:Soil / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D008372:Manure; D012987:Soil; D002482:Cellulose; D008697:Methane
keywords: Cellulolytic bacteria; Methane emission; Methanogens; Rice paddy soil; Synergistic interaction