Estimations of emission factors for fertilizer-induced direct N_2O emissions from agricultural soils in Japan : Summary of available data(Environment)
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概要
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Agricultural fields are significant sources of anthropogenic atmospheric nitrous oxide (N_2O). We compiled and analyzed data on N_2O emissions from Japanese agricultural fields (246 measurements from 36 sites) reported in peer-reviewed journals and research reports. Agricultural fields were classified into three categories: upland fields, tea fields and rice paddy fields. In this analysis, data measured over a period of more than 90 days for upland fields and 209 days for tea fields were used to estimate annual fertilizer-induced emission factors (EF) because of limitations in the available data. The EF is defined as the emission from fertilized plots minus the background emission (emission from a zero-N control plot), and is expressed as a percentage of the N applied. The mean of N_2O emissions from upland fields with well-drained soils was significantly lower than that from poorly drained soils. Mean (± standard deviation) N_2O emissions measured over a period of more than 90 days from fertilized upland fields were 1.03 ± 1.14 kg N ha^<-1> and 4.78 ± 5.36 kg N ha^<-1> for well-drained and poorly drained soils, respectively. Because the ratio of the total areas of well-drained soils and poorly drained soils was different from the ratio of the number of available EF data for each soil category, we used a weighted mean to estimate EF for all upland fields. The EF was estimated to be 0.62 ± 0.48% for all fertilized upland fields. Mean N_2O emissions and the estimated EF for fertilized tea fields measured over a period of more than 209 days were 24.3 ± 16.3 kg N ha^<-1> and 2.82 ± 1.80%, respectively. The mean N_2O emission and estimated EF from Japanese rice paddy fields were 0.36 kg N ha^<-1> and 0.31 ± 0.31% for the cropping season, respectively. Significant uncertainties remain in these results because of limitations in the available data.
著者
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Yan Xiaoyuan
Inst. Soil Sci. Chinese Acad. Sci. Nanjing Chn
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Yan Xiaoyuan
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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YAGI Kazuyuki
National Institute for Agro-environmental Sciences
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AKIYAMA Hiroko
National Institute for Agro-Environmental Sciences
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Yagi Kazuyuki
National Institute For Aero-environmental Sciences
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Yan Xiaoyuan
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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Yagi Kazuyuki
National Inst. For Agro‐environmental Sci. Ibaraki Jpn
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YAN Xiaoyuan
State Key Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences
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