@article{oai:rakuno.repo.nii.ac.jp:00000478,
 author = {SAWAMOTO, Takuji and 澤本, 卓治 and 西田, 拓生 and 松中, 照夫},
 issue = {3},
 journal = {環境科学会誌, Environmental science},
 month = {May},
 note = {Article, 農地に施用される肥料窒素の一部は,土壌表層における硝化あるいは脱窒により亜酸化窒素(N_20)となり大気に排出(直接排出)される。これに対して,窒素溶脱により生成したN_20が排水に過飽和で溶存し,これが地表水となった場合,二次的に大気に排出(間接排出)される。バイオガスプラントでつくられた乳牛ふん尿のメタン発酵消化液を散布し,牧草のチモシーを栽培したライシメーター地下排水からの溶存N_20排出を,秋の多雨期間(2ヶ月間)に調査した。その結果,N_20間接排出量とN_20直接排出量および硝酸イオン(NO_3^-)溶脱量との間に正の有意な相関関係が認められた。今後同様な調査を年間を通して実施する必要があるが,施用窒素が効果的に作物に吸収されるような肥培管理がNO_3^-溶脱,さらに間接・直接N_20排出を抑制するために重要であると示唆された。Some parts of nitrogen applied to arable land are directly emitted to the atmosphere as nitrous oxide (N_20) gas, which is produced by nitrification and denitrification processes in the topsoil (direct N_20 emission) . In addition, super-saturated dissolved N_20 in drainage water, originated from nitrogen leaching, is secondary emitted after discharging to the ground water (indirect N_20 emission). During pluvial autumn (two months), we measured N_20 emission through drainage water from timothy sward in a lysimeter experiment, where anaerobically digested cattle slurry had been applied. The amount of indirect N_20 emission was significantly related to that of direct N_20 emission and nitrogen leaching. It was suggested that management producing high nitrogen uptake by crop will suppress both indirect and direct N_20 emission as well as nitrate leaching from arable land, although the experiment through a whole year is required.},
 pages = {191--197},
 title = {チモシーを栽培したライシメーター地下排水からの溶存N_2O排出},
 volume = {23},
 year = {2010}
}