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于水稻生长季进行室外盆栽试验,人工模拟UV-B辐射增强20%,采用静态箱-气相色谱法测定稻田生态系统的呼吸速率、CH4和N2O排放通量,研究UV-B辐射增强对稻田生态系统呼吸速率、CH4和N2O排放通量的影响.结果表明,UV-B辐射增强没有改变稻田呼吸速率、CH4和N2O排放通量的季节变化规律;与对照相比,平均呼吸速率经UV-B辐射增强处理后从(1 306.83±100.21)mg.(m2.h)-1降至(1 266.23±147.60)mg.(m2.h)-1,降低3.11%;平均CH4排放通量从(2.40±0.48)mg.(m2.h)-1降至(2.02±0.52)mg.(m2.h)-1,降低15.84%.而对照与处理的平均N2O排放通量分别是(217.45±1.72)μg.(m2.h)-1和(229.22±26.02)μg.(m2.h)-1,处理比对照增加5.41%;但以上指标的差异均没有达到显著水平(P>0.05).本研究表明,UV-B辐射增强20%对稻田呼吸速率、CH4和N2O排放通量无显著影响.
The outdoor pot experiment was conducted during the growing season of rice. Artificial simulated UV-B radiation was enhanced by 20%. The respiratory rate, CH4 and N2O flux of paddy field ecosystem were measured by static box-gas chromatography. The effects of enhanced UV-B radiation on paddy field ecology System respiration rate, CH4 and N2O flux.The results showed that the UV-B radiation did not change the seasonal variation of the respiration rate, CH4 and N2O fluxes of paddy field; compared with the control, the average respiration rate by UV-B The average CH4 flux decreased from (1.306.83 ± 100.21) mg. (M2.h) -1 to (1 266.23 ± 147.60) mg. (M2.h) -1 after radiation enhancement. (M2.h) -1 to (2.02 ± 0.52) mg. (M2.h) -1 decreased by 15.84%, while the average N2O fluxes of control and treatment were (217.45 ± 1.72) ± 0.48, (m2.h) -1 and (229.22 ± 26.02) μg. (m2.h) -1, respectively, increased by 5.41% compared with the control, but the above indexes did not reach significant level (P> 0.05) The results showed that the enhancement of UV-B radiation by 20% had no significant effect on the respiration rate, CH4 and N2O flux in paddy fields.