Abstract
Nitrogen fertilizer has considerable effects on soil carbon fluxes. However, the responses of soil CO2 emission to N fertilizer remain controversial. A field experiment was conducted to examine the effect of application of N fertilizer on soil CO2 emission in a maize (Zea mays L.) field in Northeast China. Soil CO2 emission was measured from May 2010 to April 2016. Soil CO2 emission during the growing season and non-growing season contributed 79.7–83.6% and 16.4–20.3%, respectively, to the total annual CO2 emission. Cumulative annual soil CO2 emissions were significantly higher in no-N addition treatment (CK) than that in N addition treatment (SU) from 2012/2013 to 2015/2016 (p < 0.05). Mean annual soil CO2 emission decreased on averaged by 21.2% after N fertilization (p < 0.05). 49.6–82.2% of CO2 flux variation was explained by soil temperature at 5 cm depth. Q10 of soil CO2 emission in the annual scale was not significantly affected by N fertilizer. The results highlight the importance of N fertilizer on soil CO2 emission in agricultural ecosystem.
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Funding
This study was financially supported by the Non-Profit Research Foundation for Agriculture (201103039), National Key Research and Development Program of China (2020YFA0907800), Open Research Project of Shouguang Facilities Agriculture Center in Institute of Applied Ecology (2018SG-S-02), the Natural Science Research Programme of Huai’an (HAB202055), and Huai’an Excellent Youth Science Foundation and the National Natural Science Foundation of China (42107348).
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Dan Dong: writing of draft, visualization, and funding acquisition; Weichao Yang: supervision, reviewing and editing; Hao Sun: methodology; Shuang Kong: visualization editing; Hui Xu: investigation and funding acquisition.
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Dong, D., Yang, W., Sun, H. et al. Nitrogen fertilization decrease soil CO2 emission in a rainfed maize field in Northeast China. Environ Sci Pollut Res 29, 81256–81264 (2022). https://doi.org/10.1007/s11356-022-21502-5
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DOI: https://doi.org/10.1007/s11356-022-21502-5