Effects of Corn Stalks and Urea on N2O Production from Corn Field Soil
2021
Wu, Kaikuo | Zhang, Zhe | Feng, Liangshan | Bai, Wei | Feng, Chen | Song, Yuchao | Gong, Ping | Meng, Yue | Zhang, Lili
Returning corn stalks to the field is an important and widely used soil management practice which is conducive to the sustainable development of agriculture. In this study, the effects of corn stalks and urea on N₂O production in corn field soil were investigated through a 21-day incubation experiment. This study showed that increasing amounts of urea added to soil with a history of corn cultivation leads to increasing overall N₂O emissions, by increasing both the intensity and the duration of emissions. Although N₂O production was affected primarily by urea-derived NH₄⁺-N and NO₃⁻-N, its main source was native soil nitrogen, which accounted for 78.5 to 94.5% of N₂O. Returning corn stalk residue to the field reduced the production of N₂O, and the more urea was applied, the stronger the effect of corn residue on reducing N₂O emissions. Combining the application of corn stalks and urea could reduce the concentration of NH₄⁺-N and NO₃⁻-N derived from urea, and then reduce the substrate required for N₂O production in nitrification and denitrification processes. In addition, the combined application of corn stalks and urea could effectively inhibit the abundance of key N₂O-producing genes AOA amoA, nirS and nirK.
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