Emission of N_2O and CO_2 and Uptake of CH_4 in Soil from a Satsuma Mandarin Orchard under Mulching Cultivation in Central Japan
スポンサーリンク
概要
- 論文の詳細を見る
The flux of nitrous oxide (N_2O), methane (CH_4) and carbon dioxide (CO_2) from brown lowland soils in a satsuma mandarin (Citrus unshiu Marcow, 'Silverhill', 31 years old) orchard located in Okitsu, central Japan facing the North Pacific Ocean, was measured once a week from March 2001 to February 2002 using the closed chamber method. Two categories of treatment, mulching and non-mulching, were used in the experimental field by covering the soil surface with a moisture-permeable and waterproof sheet in the latter half of fruit growing season from mid-September to mid-December in 2001. The annual N_2O emission and the amount of total nitrogen fertilized were 93mg N/m^2/year and 27.0g N/m^2/year for the non-mulching treatment and 55mg N/m^2/year and 18.9g N/m^2/year for the mulching treatment, respectively. No significant difference was found in the N_2O emission factor between mulching (0.34%) and non-mulching (0.29%) treatment. These emission factors were much lower than the average value (0.62%) for upland fields in Japan and the IPCC default value of 1.25%. On the other hand, a small amount of atmospheric methane was absorbed into the surface soils throughout the year. The annual uptake of CH_4 was 24 and 17mg CH_4/m^2/year for the non-mulching and mulching treatment, respectively, with no significant difference between the two treatments. Annual CO_2 emission with the non-mulching and mulching treatment was 1.45 and 0.89kg CO_2/m^2/year, respectively. The difference in the amount of each gas emission between the two treatments was discussed with respect to the soil temperature, water-filled pore space (WFPS), the timing and amount of nitrogen fertilized, and the effect of mulching.
- 園芸学会の論文
著者
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OKUDA Hitoshi
Department of Organic and Polymeric Materials, Tokyo Institute of Technology
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Okuda Hitoshi
Department Of Citriculture Okitsu National Institute Of Fruit Tree Science:(present)field Science Ce
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YAGI Kazuyuki
National Institute for Agro-environmental Sciences
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Noda Katsuji
Department of Citriculture, Okitsu, National Institute of Fruit Tree Science
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Sawamoto Takuji
National Institute for Agro-Environmental Sciences
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Tsuruta Haruo
National Institute for Agro-Environmental Sciences
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Hirabayashi Toshio
Department of Citriculture, Okitsu, National Institute of Fruit Tree Science
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Yonemoto John
Japan International Research Center for Agricultural Sciences (JIRCAS)
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Tsuruta Haruo
National Institute For Agro-environmental Sciences:(present)center For Climate System Research The U
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Sawamoto Takuji
National Institute For Agro-environmental Sciences:(present)faculty Of Dairy Sciences Rakuno Gakuen
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Noda Katsuji
Department Of Citriculture Okitsu National Institute Of Fruit Tree Science:(present)center For Envir
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Yagi Kazuyuki
National Institute For Agro-environmental Science (niaes)
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Hirabayashi Toshio
Department Of Citriculture Okitsu National Institute Of Fruit Tree Science:(present)pear Chestnut An
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Yagi Kazuyuki
National Institute For Aero-environmental Sciences
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Yagi Kazuyuki
National Inst. For Agro‐environmental Sci. Ibaraki Jpn
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Noda Katsuji
Department of Chemical Engineering, Shizuoka University
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