title: [Impacts of enhanced UV-B radiation on respiration rate, CH4 and N2O emission fluxes from rice paddy].
abstract: To investigate the impacts of enhanced UV-B radiation on respiration rate, CH4 and N2O emission fluxes from soil-rice system, outdoor pot experiment was carried out during the rice growing season in 2004. The enhanced UV-B radiation treatments were simulated by a 20% increase in its intensity. The gas emission fluxes were measured by static chamber-gas chromatograph method. Results showed that enhanced UV-B radiation (T) did not change the seasonal patterns of respiration rate, CH4 and N2O emission. Compared to the control, mean respiration rate of T was decreased by 3.11%, from (1 306.83 +/- 100.21) mg x (m2 x h)(-1) to (1 266.23 +/- 147.60) mg x (m2 x h)(-1); Mean CH4 fluxes was decreased by 15.84%, from (2.40 +/- 0.48) mg x (m2 x h)(-1) to (2.02 +/- 0.52) mg x (m2 x h)(-1); Mean N2O emission fluxes of T was increased by 5.41%, from (217.45 +/- 1.72) microg x (m2 x h)(-1) to (229.22 +/- 26.02) microg x (m2 x h)(-1), while there no significant differences (P > 0.05). Our findings suggested that enhanced UV-B radiation had no significant effects on respiration rate, CH4 and N2O emission fluxes of soil-rice system.
authors.affiliation: Jiangsu Key Laboratory of Agricultural Meteorology, 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: Hui
authors.initials: H
authors.lastname: Ling
authors.forename: Shu-Tao
authors.initials: ST
authors.lastname: Chen
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.forename: Jing-Yan
authors.initials: JY
authors.lastname: Jiang
authors.forename: Chuan-Po
authors.initials: CP
authors.lastname: Niu
mesh_terms: D019069:Cell Respiration / Q000528:radiation effects; D017753:Ecosystem; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012275:Oryza / Q000254:growth & development / Q000502:physiology* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D009609:Nitrous Oxide; D008697:Methane