title: [Effects of elevated ozone concentration on CO2 emission from soil-winter wheat system].
abstract: To investigate the impact of elevated ozone (O3) on CO2 emission from soil-winter wheat system, outdoor experiments with simulating elevated O3 concentration were conducted, and static dark chamber-gas chromatograph method was used to measure CO2 emission fluxes. Results indicated that the elevated O3 did not change the seasonal pattern of CO2 emissions from soil-winter wheat system, but significantly decreased CO2 emission fluxes during turning-green stage and elongation-pregnant stage. From heading to maturity, CO2 emission fluxes were not found to be significant difference under 100 nL x L(-1) O3 treatment compared with the control, while 150 nL x L(-1) O3 treatment significantly declined CO2 emission fluxes. Significant relationships were found between respiration rate and air temperature under the control, 100 nL x L(-1) and 150 nL x L(-1) O3 treatment, and the fitting equation determined coefficients R2 were 0.139, 0.513 and 0.211, respectively. In addition, the Q10 (temperature sensitivity coefficients) for soil-winter wheat system's respiration were 1.13, 1.58 and 1.21, respectively. The results of this study suggested that elevated O3 could reduce CO2 emissions from agroecosystem.
authors.affiliation: College of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China. zhhu@nuist.edu.cn
authors.forename: Zheng-Hua
authors.initials: ZH
authors.lastname: Hu
authors.forename: Cen-Zi
authors.initials: CZ
authors.lastname: Li
authors.forename: Shu-Tao
authors.initials: ST
authors.lastname: Chen
authors.forename: Han-Mao
authors.initials: HM
authors.lastname: Li
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Yang
authors.forename: Shuang-He
authors.initials: SH
authors.lastname: Shen
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D003198:Computer Simulation; D010126:Ozone / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000032:analysis; D014908:Triticum / Q000254:growth & development*; D014867:Water / Q000032:analysis
chemical_list: D000393:Air Pollutants; D012987:Soil; D014867:Water; D002245:Carbon Dioxide; D010126:Ozone