N 2 O emission factors for organic amendments in Japan from measurement campaign and systematic review

Organic amendments are important sources of nitrous oxide (N O) emissions from agricultural soils. In 2020, the total amount of N in organic amendments applied to Japanese agricultural soils (440 ktN) was larger than that of synthetic fertilizer (374 ktN). However, N O emissions from organic amendme...

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Veröffentlicht in:The Science of the total environment 2023-03, Vol.864, p.161088
Hauptverfasser: Akiyama, Hiroko, Sano, Tomohito, Nishina, Kazuya, Sudo, Shigeto, Oura, Noriko, Fujimori, Miho, Uezono, Ichiro, Yano, Shinji, Ohkoshi, Satoru, Fujita, Yutaka, Shiratori, Yutaka, Tsuji, Masaki, Hasukawa, Hiroyuki, Suzue, Yasufumi, Yamada, Yasunao, Mizukami, Hiroyuki, Matsumoto, Takehiko, Yagi, Kazuyuki
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Sprache:eng
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Zusammenfassung:Organic amendments are important sources of nitrous oxide (N O) emissions from agricultural soils. In 2020, the total amount of N in organic amendments applied to Japanese agricultural soils (440 ktN) was larger than that of synthetic fertilizer (374 ktN). However, N O emissions from organic amendments were estimated by using the country-specific N O emission factor (EF) for synthetic fertilizer (0.31 % for rice paddy, 2.9 % for tea, and 0.62 % for other crops) in the National Greenhouse Gas Inventory Report of Japan. Thus, we conducted a N O flux measurement campaign at 12 different experimental sites across Japan to estimate fertilizer-induced N O EFs for major organic amendments in Japan, that is, poultry manure compost, swine manure compost, cattle manure compost, and organic fertilizer pellets. In addition, we conducted systematic review of N O emissions and EFs for organic amendments, including data from our measurement campaign and published data from peer-reviewed papers in Japan. The final dataset, including the field measurement campaign and published data, resulted in 404 observations (including synthetic fertilizer and zero-N control) in 29 sites. Results showed that soil type affected EFs, that is, the mean EF of Andosols was lower than that of non-Andosols, which is similar to the case of EFs for synthetic fertilizer. Mean EFs for poultry manure compost, swine manure compost, cattle manure (compost and slurry), and non-animal manure organic fertilizers were 0.83 % (uncertainty range of 2.5th and 97.5th percentile: 0.09 % to 3.46 %), 0.70 % (0.02 % to 2.45 %), 0.39 % (0.00 % to 1.62 %), and 1.16 % (0.41 % to 3.03 %), respectively, when weighted by area of soil types. The mean EF of all organic amendments was 0.84 % (0.00 % to 2.91 %), when the area of soil type and amount of organic amendment used in Japan were considered. Our study provides country-specific EFs to estimate N O emission from organic amendments in Japan.
ISSN:1879-1026
DOI:10.1016/j.scitotenv.2022.161088