| 地表UV-B辐射增强对土壤-冬小麦系统N2O排放的影响机理研究 |
| 摘要点击 3089 全文点击 1876 投稿时间：2005-10-30 修订日期：2005-12-27 |
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| 中文关键词 UV-B 土壤-小麦系统 N2O排放 N代谢 |
| 英文关键词 UV-B soil-wheat ecosystem N2O flux nitrogen metabolism |
| DOI 10.13227/j.hjkx.20060903 |
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| 中文摘要 |
| 为了解UV-B增强条件下农田N2O响应规律,采用室外盆栽实验,研究了地表UV-B辐射增强20%对土壤-冬小麦系统N2O排放的影响及其影响机理.结果表明,在小麦返青期,UV-B辐射增强处理对该系统N2O的排放影响不显著;在小麦的拔节期,UV-B辐射增强处理显著降低了土壤-小麦系统N2O的排放,并减少了该系统的呼吸速率.UV-B辐射增强对N2O的影响机理主要表现在对小麦植株N代谢过程的影响,如显著增加 |
| 英文摘要 |
| To study the influencing mechanisms of enhanced UV-B radiation on the emission of N2O from soil-wheat system,outdoor pot experiments with simulating 20% supplemental level of UV-B were conducted.Results indicate that the enhanced UV-B had no significant impact on the emission of N2O from soil-wheat system in turning-green stage,but declined the N2O flux and the rate of the system's respiration in elongation stage.The impact mechanisms of enhanced UV-B radiation on the N2O flux were to directly change the nitrogen metabolism process of wheat plant,such as significantly increasing soluble protein,total nitrogen and total phosphorus in wheat leaves.But the effects of UV-B radiation on soil N2O emission may be indirect,namely,UV-B treatment by working on wheat plant significantly increased the soil available nitrogen,soil microbial biomass C and N,and also changed the ratio of soil microbial C∶N(from 5.0 to 6.8) in winterwheat rhizosphere. |
