| 要旨トップ | 目次 | 日本生態学会第59回全国大会 (2012年3月,大津) 講演要旨
ESJ59/EAFES5 Abstract


一般講演(口頭発表) E1-03 (Oral presentation)

Nitrous oxide production processes in contrasting soils after fertiliser application - 15N-tracing study

*Uchida, Y. (NIAES), von Rein, I.(Freiberg Univ.), Akiyama, H. (NIAES)

One of the objectives of our study was to determine the changes in N2O emissions in two contrasting soils, after the application of urea or coated urea. Coated urea is a new attempt to reduce soil N2O emissions. However, there is evidence that the reduction of N2O emissions due to coated urea strongly depends on the used soil type. We hypothesized that changes in nitrification and/or denitrification rates after fertilizer application can explain the difference in N2O emissions from coated urea in different soils. Thus nitrification and denitrification rates were determined using a 15N tracer technique at 3 timings, before, 1 week and 1 month after fertilizer application. By using coated urea on Andosol a reduction of N2O emissions of around 30% could be achieved, however, in Fluvisol no significant decrease was observed. For Fluvisol nitrification as well as denitrification contributed equally to N2O emissions when urea was applied whereas the contribution of nitrification to N2O production was enhanced only when coated urea was applied. Thus, the efficiency of coated urea with regards to N2O production is depending on the soil type and the magnitude of the enhancement of soil processes (nitrification and denitrification) determined this efficiency.


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