|| 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
一般講演（ポスター発表） P3-287A (Poster presentation)
Methane (CH4) and nitrous oxide (N2O) are important green house gases. The large amount of CH4 is released from ruminant and the excreta. Excreta from grazing animal also stimulate N2O emission in pasture. To observe the effect of global warming on CH4 and N2O budget in grazed pasture, soil warming experiment was conducted using an electric infrared heater. We set up control and warming plots, which was increased soil temperature at 3 cm depth by about 2 °C using the heater. We measured CH4 and N2O flux in a pasture (Zoysia japonica) and cattle dung patch from June to September 2009. In pasture, control and warming plots absorbed CH4 slightly under normal condition although warming plots emitted CH4 after fertilization. N2O fluxes were small in both control and warming plots. We found no effect of the warming experiment on N2O fluxes. Dung patches emitted a large amount of CH4 just after dung setting, and then decreased quickly. While control plots absorbed CH4 after 25 days of the setting, warming plots emitted CH4 continuously throughout the study period. Dung patches emitted the large amount of N2O in both warming and control plots. And there is no difference of N2O flux between the two plots in dung patches. Our results suggested that the effect of soil warming experiment can increase the CH4 emission from dung patch although the experiment did not affect N2O fluxes in both pasture and dung patch.