title: [Short-term effects of different tillage modes combined with straw-returning on the soil labile organic carbon components in a farmland with rice-wheat double cropping].
abstract: A two-year (2009-2011) field experiment was conducted to study the effects of different tillage modes, straw-returning, and their interactions on the soil total organic carbon (TOC) and labile organic carbon (LOC) components (easily oxidizable organic carbon (EOC), water-soluble organic carbon (WSOC), and microbial biomass carbon (MBC)) at the soil depths of 0-7, 7-14, and 14-21 cm in a farmland with rice-wheat double cropping. In all treatments of straw-returning, the TOC and LOC contents in each soil layer were significantly higher than those without straw-returning. Under plowing tillage, the MBC content in 0-7 cm soil layer was significantly higher than that under rotary tillage, but the EOC content was in adverse. Rotary tillage made the TOC content in 7 - 14 cm soil layer being significantly higher, as compared with plowing tillage. The TOC, WSOC, and MBC contents in 14-21 cm soil layer under plowing tillage were significantly higher than those under rotary tillage. Plowing tillage combined with rice and wheat straws-returning made the soil TOC content being higher than the other treatments.
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. ymf0615@163.com
authors.forename: Min-Fang
authors.initials: MF
authors.lastname: Yang
authors.forename: Li-Qun
authors.initials: LQ
authors.lastname: Zhu
authors.forename: Xin-Zhong
authors.initials: XZ
authors.lastname: Han
authors.forename: Ke-Jun
authors.initials: KJ
authors.lastname: Gu
authors.forename: Nai-Juan
authors.initials: NJ
authors.lastname: Hu
authors.forename: Xin-Min
authors.initials: XM
authors.lastname: Bian
mesh_terms: D000383:Agriculture / Q000379:methods*; D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D002681:China; D017753:Ecosystem; D009930:Organic Chemicals / Q000032:analysis; D012275:Oryza / Q000737:chemistry / Q000254:growth & development*; D018547:Plant Stems / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods; D012987:Soil / Q000737:chemistry*; D014908:Triticum / Q000254:growth & development*
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002244:Carbon