title: [Effects of diurnal warming on soil N2O emission in soybean field].
abstract: To investigate the impact of experimental warming on N2O emission from soil of soybean field, outdoor experiments with simulating diurnal warming were conducted, and static dark chamber-gas chromatograph method was used to measure N2O emission fluxes. Results indicated that: the diurnal warming did not change the seasonal pattern of N2O emissions from soil. In the whole growing season, comparing to the control treatment (CK), the warming treatment (T) significantly enhanced the N2O flux and the cumulative amount of N2O by 17.31% (P = 0.019), and 20.27% (P = 0.005), respectively. The significant correlations were found between soil N2O emission and soil temperature, moisture. The temperature sensitivity values of soil N2O emission under CK and T treatments were 3.75 and 4.10, respectively. In whole growing stage, T treatment significantly increased the crop aboveground and total biomass, the nitrate reductase activity, and total nitrogen in leaves, while significantly decreased NO3(-) -N content in leaves. T treatment significantly increased soil NO3(-) -N content, but had no significant effect on soil organic carbon and total nitrogen contents. The results of this study suggested that diurnal warming enhanced N2O emission from soil in soybean field.
authors.affiliation: Jiangsu Key Laboratory of Agricultural Meteorology & Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044, China. zhhu@nuist.edu.cn
authors.forename: Zheng-Hua
authors.initials: ZH
authors.lastname: Hu
authors.forename: Ying-Ping
authors.initials: YP
authors.lastname: Zhou
authors.forename: Hai-Ling
authors.initials: HL
authors.lastname: Cui
authors.forename: Shu-Tao
authors.initials: ST
authors.lastname: Chen
authors.forename: Qi-Tao
authors.initials: QT
authors.lastname: Xiao
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
mesh_terms: D018533:Biomass; D009584:Nitrogen / Q000737:chemistry; D009609:Nitrous Oxide / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D013025:Glycine max; D013696:Temperature
chemical_list: D012987:Soil; D009609:Nitrous Oxide; D009584:Nitrogen