title: Response of nitric and nitrous oxide fluxes to N fertilizer application in greenhouse vegetable cropping systems in southeast China.
abstract: It is of great concern worldwide that active nitrogenous gases in the global nitrogen cycle contribute to regional and global-scale environmental issues. Nitrous oxide (N2O) and nitric oxide (NO) are generally interrelated in soil nitrogen biogeochemical cycles, while few studies have simultaneously examined these two gases emission from typical croplands. Field experiments were conducted to measure N2O and NO fluxes in response to chemical N fertilizer application in annual greenhouse vegetable cropping systems in southeast China. Annual N2O and NO fluxes averaged 52.05 and 14.87 μg N m(-2) h(-1) for the controls without N fertilizer inputs, respectively. Both N2O and NO emissions linearly increased with N fertilizer application. The emission factors of N fertilizer for N2O and NO were estimated to be 1.43% and 1.15%, with an annual background emission of 5.07 kg N2O-N ha(-1) and 1.58 kg NO-N ha(-1), respectively. The NO-N/N2O-N ratio was significantly affected by cropping type and fertilizer application, and NO would exceed N2O emissions when soil moisture is below 54% WFPS. Overall, local conventional input rate of chemical N fertilizer could be partially reduced to attain high yield of vegetable and low N2O and NO emissions in greenhouse vegetable cropping systems in China.
authors: Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Nanjing Agricultural University, Nanjing 210095, China.|Department of Environmental Sciences, Centre for Carbon, Water and Food, The University of Sydney, New South Wales 2570, Australia.
authors: Yaojun
authors: Y
authors: Zhang
authors: Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Nanjing Agricultural University, Nanjing 210095, China.
authors: Feng
authors: F
authors: Lin
authors: Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Nanjing Agricultural University, Nanjing 210095, China.
authors: Yaguo
authors: Y
authors: Jin
authors: Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Nanjing Agricultural University, Nanjing 210095, China.
authors: Xiaofei
authors: X
authors: Wang
authors: Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Nanjing Agricultural University, Nanjing 210095, China.
authors: Shuwei
authors: S
authors: Liu
authors: Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Nanjing Agricultural University, Nanjing 210095, China.
authors: Jianwen
authors: J
authors: Zou
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D002681:China; D018556:Crops, Agricultural / Q000737:chemistry*; D004784:Environmental Monitoring; D005308:Fertilizers / Q000032:analysis*; D017752:Greenhouse Effect; D009569:Nitric Oxide / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012621:Seasons
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D009569:Nitric Oxide; D009609:Nitrous Oxide