Nutrient Cycling in Agroecosystems

, Volume 63, Issue 2–3, pp 239–247 | Cite as

Nitrous oxide emissions for 6 years from a gray lowland soil cultivated with onions in Hokkaido, Japan

  • Kanako Kusa
  • Takuji Sawamoto
  • Ryusuke Hatano

Abstract

We studied nitrous oxide (N2O) emissions every growing season (April to October) for 6 years (1995∼2000), in a Gray Lowland soil cultivated with onions in central Hokkaido, Japan. Emission of N2O from the onion field ranged from 0.00 to 1.86 mgN m−2 h−1. The seasonal pattern of N2O emission was the same for 6 years. The largest N2O emissions appeared near harvesting in August to October, and not, as might be expected, just after fertilization in May. The seasonal patterns of soil nitrate (NO3) and, ammonium (NH4+) levels and the ratio of N2O to NO emission indicated that the main process of N2O production after fertilization was nitrification, and the main process of N2O production around harvest time was denitrification. N2O emission was strongly influenced by the drying–wetting process of the soil, as well as by the high soil water content. The annual N2O emission during the growing season ranged from 3.5 to 15.6 kgN ha−1. The annual nitrogen loss by N2O emission as a percentage of fertilizer-N ranged from 1.1 to 6.4%. About 70% of the annual N2O emission occurred near harvesting in August to October, and less than 20% occurred just after fertilization in May to July. High N2O fluxes around the harvesting stage and a high proportion of N2O emission to total fertilizer-N appeared to be probably a characteristic of the study area located in central Hokkaido, Japan.

denitrification gray lowland soil nitrification nitrous oxide (N2O) rainfall 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Kanako Kusa
    • 1
    • 2
  • Takuji Sawamoto
    • 1
    • 3
  • Ryusuke Hatano
    • 1
    • 4
  1. 1.Laboratory of Soil Science, Graduate School of AgricultureHokkaido UniversitySapporoJapan
  2. 2.National Agricultural Research Center for Kyushu Okinawa RegionFukuokaJapan
  3. 3.National Institute for Agro-environmental SciencesTsukubaJapan
  4. 4.Field Science Center for Northern BiosphereHokkaido UniversitySapporoJapan

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