title: The effects of rape residue mulching on net global warming potential and greenhouse gas intensity from no-tillage paddy fields.
abstract: A field experiment was conducted to provide a complete greenhouse gas (GHG) accounting for global warming potential (GWP), net GWP, and greenhouse gas intensity (GHGI) from no-tillage (NT) paddy fields with different amounts of oilseed rape residue mulch (0, 3000, 4000, and 6000 kg dry matter (DM) ha(-1)) during a rice-growing season after 3 years of oilseed rape-rice cultivation. Residue mulching treatments showed significantly more organic carbon (C) density for the 0-20 cm soil layer at harvesting than no residue treatment. During a rice-growing season, residue mulching treatments sequestered significantly more organic C from 687 kg C ha(-1) season(-1) to 1654 kg C ha(-1) season(-1) than no residue treatment. Residue mulching significantly increased emissions of CO2 and N2O but decreased CH4 emissions. Residue mulching treatments significantly increased GWP by 9-30% but significantly decreased net GWP by 33-71% and GHGI by 35-72% relative to no residue treatment. These results suggest that agricultural economic viability and GHG mitigation can be achieved simultaneously by residue mulching on NT paddy fields in central China.
authors.affiliation: College of Plant Science and Technology, Huazhong Agricultural University, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China ; Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China.
authors.forename: Zhi-Sheng
authors.initials: ZS
authors.lastname: Zhang
authors.affiliation: College of Plant Science and Technology, Huazhong Agricultural University, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China ; Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China.
authors.forename: Cou-Gui
authors.initials: CG
authors.lastname: Cao
authors.affiliation: College of Plant Science and Technology, Huazhong Agricultural University, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China ; Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China.
authors.forename: Li-Jin
authors.initials: LJ
authors.lastname: Guo
authors.affiliation: College of Plant Science and Technology, Huazhong Agricultural University, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China ; Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, No. 1 Shizishan Street, Hongshan District, Wuhan, Hubei 430070, China.
authors.forename: Cheng-Fang
authors.initials: CF
authors.lastname: Li
mesh_terms: D000383:Agriculture / Q000379:methods*; D029688:Brassica napus; D018556:Crops, Agricultural; D004784:Environmental Monitoring; D057232:Global Warming; D012275:Oryza / Q000254:growth & development*; D059027:Recycling; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil