Nitrification and Denitrification and its Response to Biochar Addition in Agricultural Soil：A Review

doi:10.3969/j.issn.1000-6362.2018.07.002

Abstract

Abstract: Nitrous oxide (N2O) is one of the most important greenhouse gases, and agriculture soils are the main emission sources. Nitrification and denitrification, which are dominated by microbes, are the most important emission pathways. Therefore, the soil nitrification and denitrification have been paid much attention by scientists. Based on a large quantity of literatures, this paper summarizes the methods of distinguishing the contribution of nitrification and denitrification to N2O emission, soil N2O production pathway and its influencing factors, and mechanism of the effects of biochar on N2O emission. The results showed that the response of nitrification and denitrification to biochar was different, and there was still a lot of uncertainty in the effect of biochar on N2O emission reduction. The underlying mechanism was not yet clear. As such, this paper proposed the best research method to distinguish the contribution of nitrification and denitrification to N2O emission. Finally, the research prospect of the influencing factors of nitrification and denitrification and the response mechanism of biochar in farmland soil were also proposed.

Key words: Nitrous oxide, Nitrification inhibitor, Soil microbe, Functional gene

ZHAO Guang-xin, ZHANG Qing-wen, LIU Xing-ren, TIAN Xiu-ping. Nitrification and Denitrification and its Response to Biochar Addition in Agricultural Soil：A Review[J]. Chinese Journal of Agrometeorology, 2018, 39(07): 442-452.

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