title: Effect of nitrogen fertilizer and/or rice straw amendment on methanogenic archaeal communities and methane production from a rice paddy soil.
abstract: Nitrogen fertilization and returning straw to paddy soil are important factors that regulate CH4 production. To evaluate the effect of rice straw and/or nitrate amendment on methanogens, a paddy soil was anaerobically incubated for 40 days. The results indicated that while straw addition increased CH4 production and the abundances of mcrA genes and their transcripts, nitrate amendment showed inhibitory effects on them. The terminal restriction fragment length polymorphism (T-RFLP) analysis based on mcrA gene revealed that straw addition obviously changed methanogenic community structure. Based on mcrA gene level, straw-alone addition stimulated Methanosarcinaceaes at the early stage of incubation (first 11 days), but nitrate showed inhibitory effect. The relative abundance of Methanobacteriaceae was also stimulated by straw addition during the first 11 days. Furthermore, Methanosaetaceae were enriched by nitrate-alone addition after 11 days, while Methanocellaceae were enriched by nitrate addition especially within the first 5 days. The transcriptional methanogenic community indicated more dynamic and complicated responses to straw and/or nitrate addition. Based on mcrA transcript level, nitrate addition alone resulted in the increase of Methanocellaceae and the shift from Methanosarcinaceae to Methanosaetaceae during the first 5 days of incubation. Straw treatments increased the relative abundance of Methanobacteriaceae after 11 days. These results demonstrate that nitrate addition influences methanogens which are transcriptionally and functionally active and can alleviate CH4 production associated with straw amendment in paddy soil incubations, presumably through competition for common substrates between nitrate-utilizing organisms and methanogens.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing, 100085, China.|Centre for Research in Ecotoxicology and Environmental Remediation, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin, 300191, China.
authors.forename: Qiongli
authors.initials: Q
authors.lastname: Bao
authors.affiliation: Centre for Research in Ecotoxicology and Environmental Remediation, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin, 300191, China.
authors.forename: Yizong
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing, 100085, China.
authors.forename: Fenghua
authors.initials: F
authors.lastname: Wang
authors.affiliation: Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
authors.forename: Sanan
authors.initials: S
authors.lastname: Nie
authors.affiliation: Laboratoire Ampère, École Centrale de Lyon, Université de Lyon, 36 avenue Guy de Collongue, 69134, Ecully, France.
authors.forename: Graeme W
authors.initials: GW
authors.lastname: Nicol
authors.affiliation: Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China. hyyao@iue.ac.cn.
authors.forename: Huaiying
authors.initials: H
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing, 100085, China. ljding@rcees.ac.cn.
authors.forename: Longjun
authors.initials: L
authors.lastname: Ding
mesh_terms: D001105:Archaea / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D044822:Biodiversity; D005308:Fertilizers / Q000032:analysis; D008697:Methane / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D012275:Oryza / Q000737:chemistry / Q000254:growth & development*; D010802:Phylogeny; D018547:Plant Stems / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology
chemical_list: D005308:Fertilizers; D012987:Soil; D009584:Nitrogen; D008697:Methane
keywords: Methane; Methanogens; Nitrate; Paddy soil; Rice straw