Remarkable N2 O emissions by draining fallow paddy soil and close link to the ammonium-oxidizing archaea communities

Scientific Reports
Ling WangWen-Xue Wei

Abstract

Fallow paddies experience natural flooding and draining water status due to rainfall and evaporation, which could induce considerable nitrous oxide (N2O) emissions and need to be studied specially. In this study, intact soil columns were collected from a fallow paddy field and the flooding-draining process was simulated in a microcosm experiment. The results showed that both N2O concentrations in the soil and N2O emission rates were negligible during flooding period, which were greatly elevated by draining the fallow paddy soil. The remarkable N2O concentrations in the soil and N2O emission/h during draining both had significant relationships with the Arch-amoA gene (P < 0.01) but not the Bac-amoA, narG, nirK, nirS, and nosZ genes, indicating that the ammonium-oxidizing archaea (AOA) might be the important players in soil N2O net production and emissions after draining. Moreover, we observed that N2O concentrations in the upper soil layers (0-10 cm) were not significantly different from that in the 10-20 cm layer under draining condition (P > 0.05). However, the number of AOA and the nitrification substrate (NH4+-N) in the 0-10 cm layer were significantly higher than in the 10-20 cm layer (P < 0.01), indicating N2O production i...Continue Reading

References

Oct 19, 2004·Journal of Microbiological Methods·Sonia HenryLaurent Philippot
Aug 9, 2006·Proceedings of the National Academy of Sciences of the United States of America·Cornelia WuchterJaap S Sinninghe Damsté
Mar 6, 2007·Nature Reviews. Microbiology·David L Valentine
Apr 24, 2008·Environmental Microbiology·Xue-Ping ChenJi-Zheng He
Mar 4, 2011·Proceedings of the National Academy of Sciences of the United States of America·Jennifer PratscherRalf Conrad
May 7, 2011·Current Opinion in Microbiology·Michael PesterMichael Wagner

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