| 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 |
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| 引用本文： | 蒋静艳,牛传坡,胡正华,杨玉峰,黄耀. 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[J]. 环境科学, 2006, 27(9): 1712-1716 |
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| 作者姓名： | 蒋静艳 牛传坡 胡正华 杨玉峰 黄耀 |
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| 作者单位： | 南京农业大学资源与环境科学学院 南京210095;南京农业大学资源与环境科学学院 南京210095;南京信息工程大学 南京210044;南京农业大学资源与环境科学学院 南京210095;南京农业大学资源与环境科学学院 南京210095 |
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| 基金项目： | 南京农业大学青年科技创新基金项目(KJ04007);中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室开放基金项目(LAPC-KF-2004-03) |
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| 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
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| 关 键 词： | UV-B 土壤-小麦系统 N2O排放 N代谢 |
| 文章编号： | 0250-3301（2006）09-1712-05 |
| 收稿时间： | 2005-10-30 |
| 修稿时间： | 2005-10-302005-12-27 |
Study on Mechanism of Enhanced UV-B Radiation Influencing on N2O Emission from Soil-Winter Wheat System |
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| JIANG Jing-yan,NIU Chuan-po,HU Zheng-hu,YANG Yu-feng and HUANG Yao. Study on Mechanism of Enhanced UV-B Radiation Influencing on N2O Emission from Soil-Winter Wheat System[J]. Chinese Journal of Environmental Science, 2006, 27(9): 1712-1716 |
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| Authors: | JIANG Jing-yan NIU Chuan-po HU Zheng-hu YANG Yu-feng HUANG Yao |
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| Affiliation: | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. lilacjjy@njau.edu.cn |
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| Abstract: | To study the influencing mechanisms of enhanced UV-B radiation on the emission of N20 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 N20 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 winter-wheat rhizosphere. |
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| Keywords: | UV-B soil-wheat ecosystem N2O flux nitrogen metabolism |
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