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Soil Respiration and N2O Flux Response to UV-B Radiation and Straw Incorporation in a Soybean–Winter Wheat Rotation System

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Abstract

Field experiments were conducted in the 2008–2009 soybean and winter wheat-growing seasons to assess soil respiration (SR) and nitrous oxide (N2O) emission as affected by enhanced UV-B radiation and straw incorporation. The SR rate was measured using a soil CO2 flux system; the N2O flux was measured using a static chamber–gas chromatograph technique. The results showed that in the soybean and winter wheat-growing seasons, enhanced UV-B radiation significantly decreased the SR rates and that straw incorporation increased the SR rates compared to the control treatment. The combined treatment of UV-B and straw incorporation had no obvious influence on the SR rates. Enhanced UV-B radiation, straw incorporation, and the combination treatment increased the temperature sensitivity of SR in the soybean-growing season. The study also showed that N2O emissions were reduced by enhanced UV-B radiation and that straw incorporation had no significant effects on the mean N2O emission fluxes in the soybean and winter wheat-growing seasons. Our findings suggest that enhanced UV-B radiation may lead to a decrease in SR and in N2O emissions, straw incorporation may increase SR, and the combined treatment may have no significant influence on SR and N2O emissions from soybean–winter wheat rotation systems.

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Acknowledgments

This work was conducted under the financial supports from the National Natural Science Foundation of China (41175136, 41005088), the Ministry of Education of China (grant PCSIRT), the Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province (CMA; IAM 201004), and the Qing Lan Project of Jiangsu Province (2010).

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Correspondence to Zhenghua Hu.

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Hu, Z., Cui, H., Chen, S. et al. Soil Respiration and N2O Flux Response to UV-B Radiation and Straw Incorporation in a Soybean–Winter Wheat Rotation System. Water Air Soil Pollut 224, 1394 (2013). https://doi.org/10.1007/s11270-012-1394-z

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