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Article

Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation

1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2
College of Agricultural Engineering, Hohai University, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(11), 2580; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15112580
Received: 23 October 2018 / Revised: 10 November 2018 / Accepted: 13 November 2018 / Published: 18 November 2018
The role of carbon pool of biochar as a method of long-term C sequestration in global warming mitigation is unclear. A two-year field study was conducted to investigate the seasonal variations of CO2 emissions from water-saving irrigation paddy fields in response to biochar amendment and irrigation patterns. Three biochar treatments under water-saving irrigation and one biochar treatment under flooding irrigation were studied, and the application rates were 0, 20, 40, and 40 t ha−1 and labeled as CI + NB (controlled irrigation and none biochar added), CI + MB (controlled irrigation and medium biochar added), CI + HB (controlled irrigation and high biochar added), and FI + HB (flood irrigation and high biochar added), respectively. Results showed that biochar application at medium rates (20 t ha−1) decreased CO2 emissions by 1.64–8.83% in rice paddy fields under water-saving irrigation, compared with the non-amendment treatment. However, the CO2 emissions from paddy fields increased by 4.39–5.43% in the CI + HB treatment, compared with CI + NB. Furthermore, the mean CO2 emissions from paddy fields under water-saving irrigation decreased by 2.22% compared with flood irrigation under the same amount of biochar application (40 t ha−1). Biochar amendment increased rice yield and water use efficiency by 9.35–36.30% and 15.1–42.5%, respectively, when combined with water-saving irrigation. The CO2 emissions were reduced in the CI + MB treatment, which then increased rice yield. The CO2 emissions from paddy fields were positively correlated with temperature. The highest value of the temperature sensitivity coefficient (Q10) was derived for the CI + MB treatment. The Q10 was higher under water-saving irrigation compared with flooding irrigation. View Full-Text
Keywords: water-saving irrigation; biochar; CO2; Q10; paddy field water-saving irrigation; biochar; CO2; Q10; paddy field
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MDPI and ACS Style

Yang, S.; Jiang, Z.; Sun, X.; Ding, J.; Xu, J. Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation. Int. J. Environ. Res. Public Health 2018, 15, 2580. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15112580

AMA Style

Yang S, Jiang Z, Sun X, Ding J, Xu J. Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation. International Journal of Environmental Research and Public Health. 2018; 15(11):2580. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15112580

Chicago/Turabian Style

Yang, Shihong, Zewei Jiang, Xiao Sun, Jie Ding, and Junzeng Xu. 2018. "Effects of Biochar Amendment on CO2 Emissions from Paddy Fields under Water-Saving Irrigation" International Journal of Environmental Research and Public Health 15, no. 11: 2580. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph15112580

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