| UV-B增强对稻田呼吸速率、 CH4和N2O排放的影响 |
| 摘要点击 2906 全文点击 1578 投稿时间：2010-11-17 修订日期：2011-04-06 |
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| 中文关键词 UV-B辐射 稻田 呼吸速率 CH4 N2O |
| 英文关键词 UV-B radiation rice paddy respiration rate CH4 N2O |
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| 中文摘要 |
| 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(1306.83±100.21) mg·(m2·h)-1降至(1266.23±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。 |
| 英文摘要 |
| 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 (1306.83±100.21) mg·(m2·h)-1 to (1266.23±147.60) mg·(m2·h)-1; Mean CH4 fluxes was decreased by 15.84%, from (2.40±0.48) mg·(m2·h)-1 to (2.02±0.52) mg·(m2·h)-1; Mean N2O emission fluxes of T was increased by 5.41%, from (217.45±1.72) μg·(m2·h)-1 to (229.22±26.02) μg·(m2·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. |
