Abstract
To gain insight into enhanced ultraviolet-B (UV-B) radiation effects on agroecosystem respiration rates and nitrous oxide (N2O) emissions, pot and field experiments were conducted in the 2004 and 2006 soybean-growing seasons, respectively. The enhanced UV-B radiation treatments were simulated by a 20% increase in its intensity. The respiration rates and N2O fluxes were measured by a static opaque chamber–gas chromatograph method. Results showed that the enhanced UV-B radiation did not change the seasonal patterns of ecosystem respiration and N2O emission. Compared to the controls, however, the enhanced UV-B reduced the respiration rates by 43.3% (P = 0.015) and 44.8% (P = 0.002) over the entire soybean-growing seasons in 2004 and 2006, respectively. Similarly, the enhanced UV-B radiation reduced seasonal N2O emissions by 33.5% (P = 0.023) and 42.4% (P = 0.006) in 2004 and 2006, respectively. Our findings suggest that enhanced UV-B radiation may lead to a decrease in agroecosystem respiration rates and N2O emissions from croplands. To estimate the overall effects of enhanced UV-B radiation on greenhouse gas emissions from agroecosystems, nevertheless, more field measurements deserve to be carried out in various cropping systems.
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (40605029), the China Postdoctoral Science Foundation (20070420195) and the State Key Laboratory of Soil and Sustainable Agriculture Foundation (0812000053). We thank Professor Y. Huang and W. Sun for their considerable help with the experimental design.
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Hu, Z., Jiang, J., Chen, S. et al. Enhanced UV-B radiation reduced soil-soybean ecosystem respiration and nitrous oxide emissions. Nutr Cycl Agroecosyst 87, 71–79 (2010). https://doi.org/10.1007/s10705-009-9313-4
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DOI: https://doi.org/10.1007/s10705-009-9313-4