title: Differences in net global warming potential and greenhouse gas intensity between major rice-based cropping systems in China.
abstract: Double rice (DR) and upland crop-single rice (UR) systems are the major rice-based cropping systems in China, yet differences in net global warming potential (NGWP) and greenhouse gas intensity (GHGI) between the two systems are poorly documented. Accordingly, a 3-year field experiment was conducted to simultaneously measure methane (CH4) and nitrous oxide (N2O) emissions and changes in soil organic carbon (SOC) in oil rape-rice-rice and wheat-rice (representing DR and UR, respectively) systems with straw incorporation (0, 3 and 6 t/ha) during the rice-growing seasons. Compared with the UR system, the annual CH4, N2O, grain yield and NGWP were significantly increased in the DR system, though little effect on SOC sequestration or GHGI was observed without straw incorporation. Straw incorporation increased CH4 emission and SOC sequestration but had no significant effect on N2O emission in both systems. Averaged over the three study years, straw incorporation had no significant effect on NGWP and GHGI in the UR system, whereas these parameters were greatly increased in the DR system, i.e., by 108% (3 t/ha) and 180% (6 t/ha) for NGWP and 103% (3 t/ha) and 168% (6 t/ha) for GHGI.
authors.affiliation: Jiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Zhengqin
authors.initials: Z
authors.lastname: Xiong
authors.affiliation: Jiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Yinglie
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Jiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wu
authors.affiliation: Jiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Jiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Pingli
authors.initials: P
authors.lastname: Liu
authors.affiliation: Jiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Taiqing
authors.initials: T
authors.lastname: Huang
mesh_terms: D002681:China; D000069599:Crop Production; D057232:Global Warming; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012275:Oryza / Q000254:growth & development*
chemical_list: D009609:Nitrous Oxide; D008697:Methane