Time-lagged induction of N_2O emission and its trade-off with NO emission from a nitrogen fertilized Andisol(<Special Section>Greenhouse Gas Emissions from Agroecosystems in Monsoon Asia)
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概要
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To understand the influence of basal application of N fertilizer on nitrification potential and N_2O and NO emissions, four soil samples were collected from an upland Andisol field just before (sample 1) and 4 (sample 2), 36 (sample 3) and 72 (sample 4) days after the basal application of N fertilizer during the Chinese cabbage growing season from 12 September to 30 November 2005. The potentials of N_2O production and nitrification of the soils were determined using a ^<15>N tracer technique and the soils were incubated for 25 days at 25℃ and 60% water-filled pore space (WFPS). The results revealed that as much as 84-97% N_2O and almost all NO were produced by nitrification. The ^<15>N_2O emission peak occurred approximately 350 h after the beginning of incubation for samples 1 and 2, but just 48 h later in samples 3 and 4. Total ^<15>N_2O emission during the 25-day incubation of samples 3 and 4 ranged from 190 to 198 μg N kg^<-1> soil, which was significantly higher than the 99-108 μg N kg^<-1> soil recorded in samples 1 and 2. Basal application of N fertilizer did not immediately increase the nitrification potential and the ratio of N_2O to N added, but did dramatically increase the nitrification potential and the ratio of N2O to N added as (^<15>NH_4)_2SO_4 36-72 days after the basal N fertilizer was added. In contrast, NO emission was negatively correlated with nitrification potential and total N_2O emission. As a result, a trade-off relationship between total NO and N_2O emissions was identified. The results indicated that there was a time-lagged induction of the change of N turnover in the soil, which was possibly caused by slow population growth of the nitrifiers and/or a slow shift in the microbial community in the soil.
著者
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YAGI Kazuyuki
National Institute for Agro-environmental Sciences
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Yagi Kazuyuki
Carbon And Nutrient Cycles Division National Institute For Agro-environmental Sciences
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AKIYAMA Hiroko
National Institute for Agro-Environmental Sciences
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Sudo Shigeto
National Institute For Agro-environmental Sciences
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NISHIMURA Seiichi
National Institute of Agro-Environmental Sciences
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Akiyama H
National Institute For Agro-environmental Sciences
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Yagi Kazuyuki
National Institute For Agro-environmental Science (niaes)
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DING Weixin
National Institute for Agro-Environmental Sciences
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Nishimura Seiichi
National Institute For Aero-environmental Sciences
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Ding Weixin
National Institute For Agro-environmental Sciences:state Key Laboratory Of Soil And Sustainable Agri
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Yagi Kazuyuki
National Institute For Aero-environmental Sciences
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Nishimura Seiichi
National Institute For Agro-environmental Sciences
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Akiyama Hiroko
Carbon And Nutrient Cycles Division National Institute For Agro-environmental Sciences
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Yagi Kazuyuki
National Inst. For Agro‐environmental Sci. Ibaraki Jpn
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