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- Title
Effects of Enhanced UV-B Radiation on NO Emission in a Soil-Winter Wheat System.
- Authors
Zhenghua Hu; Jingyan Jiang; Shutao Chen; Qiaohui Liu; Chuanpo Niu
- Abstract
n outdoor pot experiments was conducted to investigate the effects of enhanced ultraviolet-B (UV-B) radiation on nitrous oxide (NO) emissions from soil-winter wheat systems. The enhanced UV-B radiation treatments were simulated by 20% increase in its intensity. NO fluxes were measured with a static opaque chamber-gas chromatograph method. The results showed that enhanced UV-B radiation did not change the seasonal patterns of NO emissions. Compared to the controls, the enhanced UV-B radiation reduced NO fluxes by 16.4% ( p = 0.015) during the elongation-booting stage, while it had no significant effects on NO fluxes in the turning-green and heading-maturity phases. During the turning green-overall heading span, the accumulative NO was largely decreased by the enhanced UV-B radiation ( p < 0.05). From the overall heading to maturity, however, the effects of enhanced UV-B on NO emissions were not pronounced ( p > 0.10). At the elongation-booting stage, enhanced UV-B increased soluble proteins content in leaves, NO-N and NO-N content in rhizosphere soil, and soil microbial biomass C ( C) and N ( N; p < 0.05), as well as microbial biomass C:N ratio changing from 5.0 to 6.8. Our findings suggest that the effects of enhanced UV-B radiation on NO emissions differed with winter wheat developmental stages. To assess the overall effects of enhanced UV-B radiation on NO emissions from agroecosystems, nevertheless, more field measurements deserve to be carried out in various cropping systems.
- Subjects
ULTRAVIOLET radiation; NITRATES; SOIL management; GAS chromatography; SOIL microbial ecology
- Publication
Water, Air & Soil Pollution, 2010, Vol 213, Issue 1-4, p493
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-010-0404-2