Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Influence of N Fertilization Level, Rainfall, and Temperature on the Emission of N2O in the Jeju Black Volcanic Ash Soil with Soybean Cultivation

콩 재배 화산회토양에서 질소시비 수준 및 강우, 온도 환경 변화에 따른 아산화질소 배출 특성

  • Yang, Sang-Ho (Jeju Special Self-governing Province Agricultural Research and Extension Services) ;
  • Kang, Ho-Jun (Jeju Special Self-governing Province Agricultural Research and Extension Services) ;
  • Lee, Shin-Chan (Jeju Special Self-governing Province Agricultural Research and Extension Services) ;
  • Oh, Han-Jun (Jeju Special Self-governing Province Agricultural Research and Extension Services) ;
  • Kim, Gun-Yeob (National Academy of Agricultural Science, RDA)
  • 양상호 (제주특별자치도농업기술원) ;
  • 강호준 (제주특별자치도농업기술원) ;
  • 이신찬 (제주특별자치도농업기술원) ;
  • 오한준 (제주특별자치도농업기술원) ;
  • 김건엽 (농촌진흥청 국립농업과학원)
  • Received : 2012.03.09
  • Accepted : 2012.06.21
  • Published : 2012.06.30
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Abstract

This study was conducted to investigate the characteristic factors which have been influenced on nitrous oxide ($N_2O$) emissions related to the environment change of nitrogen application level, rainfall and temperature during the soybean cultivation at black volcanic ash soil from 2010 to 2011. During the soybean cultivation, the more amount of nitrogen fertilizer applied, $N_2O$ emissions amounts were released much. $N_2O$ emissions with the cultivation time were released much at the first and middle of cultivation with heavy rainfall, but it was released very low until the end of cultivation and drought season. $N_2O$ emissions mainly were influenced by the rainfall and soil water content. The correlation ($r$) with $N_2O$ emissions, soil water, soil temperature and soil EC in 2010 were very significant at $0.4591^{**}$, $0.6312^{**}$ and $0.3691^{**}$ respectively. In 2011, soil water was very significant at $0.4821^{**}$, but soil temperature and soil EC were not significant at 0.1646 and 0.1543 respectively. Also, $NO_3$-N and soil nitrogen ($NO_3-N+NO_4-N$) were very significant at $0.6902^{**}$ and $0.6277^*$ respectively, but $NO_4$-N was not significant at 0.1775. During the soybean cultivation, the average emissions factor of 2 years released by the nitrogen fertilizer application was presumed to be 0.0202 ($N_2O$-N kg $N^{-1}\;kg^{-1}$). This factor was higher about 2.8 and 2 times than the Japan's (0.0073 $N_2O$-N kg $N^{-1}\;kg^{-1}$) value and 2006 IPCC guideline default value (0.0100 $N_2O$-N kg $N^{-1}\;kg^{-1}$) respectively.

본 연구는 콩 재배 화산회 토양에서 질소시비 수준 및 강우, 온도 환경 변화에 따른 $N_2O$ 배출량을 측정하고 배출에 영향을 미치는 요인 특성을 구명하기 위하여 제주특별자치도 농업기술원 시험포장에서 2년간 (2010~2011년) 수행되었다. 콩 재배기간 동안 $N_2O$ 배출량은 질소시비량이 많을수록 많았다. 재배시기별 $N_2O$ 배출량은 강우량이 많은 재배 초기와 중기에 많았으나, 강우가 적고 한발 시기인 재배 말기에는 매우 적거나 거의 없는 경향을 보였다. $N_2O$ 배출 양상은 강우량 및 토양수분함량 변화와 대체로 유사한 경향을 보였다. $N_2O$ 배출량과 상관관계($r$)를 분석한 결과, '10년도에는 토양수분, 토양온도 및 토양 EC는 각각 $0.6312^{**}$, $0.4591^{**}$, $0.3691^{**}$로 모두 고도로 유의성이 인정되었다. 그러나 '11년도의 경우는 토양수분과는 $0.4821^{**}$로 고도로 유의성이 인정되었으나, 토양온도와 토양 EC와는 각각 0.1646, 0.1543로 유의성이 인정되지 않았다. $NO_3$-N과 토양 질소 ($NO_3-N+NO_4-N$)와는 각각 $0.6902^{**}$, $0.6277^*$로 유의성이 인정되었으나, $NO_4$-N과는 0.1775로 유의성은 인정되지 않았다. 질소 시비량에 따른 2년 동안의 $N_2O$ 배출량을 배출계수로 환산한 값은 0.0202 ($N_2O$-N kg $N^{-1}\;kg^{-1}$)로, 일본의 배출계수인 0.0073 $N_2O$-N kg $N^{-1}\;kg^{-1}$보다는 약 2.8배, 2006 IPCC 가이드라인의 기본계수인 0.0100 $N_2O$-N kg $N^{-1}\;kg^{-1}$보다는 약 2배 정도 높은 것으로 분석되었다.

Keywords

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