Nitrous Oxide Production from Strongly Acid Tea Field Soils

概要

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Nitrous oxide (N_2O) production from acid (pH 3.60) tea field soil under aerobic conditions was studied in a laboratory experiment. A large amount of N_2O (53 μg N g^<-1> soil 14 d^<-1>) was produced under aerobic conditions when ammonium and nitrate were added to the soil. It was assumed that the high N_2O production was an inherent property of the soil because soil pre-treatments (e.g., air-drying) did not affect it. A ^<15>N tracer study indicated that N_2 was not produced from the acid tea field soil. N_2O was produced during biological reactions, and the contribution of N_2O production during chemical reactions to the whole N_2O production was negligible. Nitrapyrin (2-chloro-6-(trichloro-methyl)-pyridine) and acetylene (0.1 Pa), which are selective nitrification inhibitors, slightly reduced N_2O production. These results indicate that denitrification is the main process of N_2O production in acid tea field soil. The levels of N_2O production from four tea field soils collected from the same area were compared. The results showed that a large amount of N_2O is likely to be produced from a soil with a pH value below about 3.60 and to which a large amount of nitrogen fertilizer (more than 1,000 kg N ha^<-1> y^<-1>) had been added.
社団法人日本土壌肥料学会の論文