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凍結融解土壌の亜酸化窒素生成・排出機構にせまる
柳井, 洋介;根本, 学;岩田, 幸良;廣田, 知良
Permalink : http://hdl.handle.net/2115/49061
KEYWORDS : 土壌凍結;亜酸化窒素（一酸化二窒素, N2O）;積雪;融雪;野外観測;Soil freezing;nitrous oxide;snow-cover;snowmelt;field observation
Abstract
季節凍土では融雪期に短期集中的な亜酸化窒素（N2O）の排出が見られる. 著者らはその現象を積雪操作実験で再現することに成功した. 本稿では2008年11月から2010年10月にわたる野外観測の結果に基づいて, 積雪深・土壌凍結深とN2Oの土壌中での蓄積・土壌から大気へのN2Oの排出の関係を考察するとともに, 未解決の課題を提示する.
Seasonally frozen soil has substantially high N2O emission under thawing conditions. We succeeded in insitu observation of the N2O emissions in a snow-cover manipulation experiment. Here, we discuss relationships among snow-cover height, soil frost depth, N2O concentration in soil and process of N2O release from soil to the atmosphere. In addition, unsolved issues are presented.
Seasonally frozen soil has substantially high N2O emission under thawing conditions. We succeeded in insitu observation of the N2O emissions in a snow-cover manipulation experiment. Here, we discuss relationships among snow-cover height, soil frost depth, N2O concentration in soil and process of N2O release from soil to the atmosphere. In addition, unsolved issues are presented.
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