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 Carrot Cultivation

당근 재배 화산회토양에서 질소시비 수준 및 강우, 온도 환경 변화에 따른 N2O 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 : 2012.06.12
  • Published : 2012.06.30
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Abstract

This study was conducted to obtain investigated characteristic factors which has an influence on nitrous oxide ($N_2O$) emissions related to the environment change of nitrogen application level, rainfall and temperature. It was done by the carrot cultivation at black volcanic ashes soil in the experimental field of Jeju Special Self-governing Province Agricultural Research and Extension Services from 2010 to 2011. During the carrot cultivation period, the more amount of nitrogen fertilizer applied, the more amount of $N_2O$ emissions were released. Generally $N_2O$ emissions were so deeply released to climate as that in the first and middle of cultivation with heavy rainfall released amount is high, otherwise it was released very low at the end of cultivation and drought season. $N_2O$ emissions type was considered to relate with the rainfall pattern and soil water content. We obtained the result correlated with $N_2O$ emissions, in 2010, as the soil water and soil temperature were significant to $0.5718^{**}$ ($r$) and $0.4908^{**}$ ($r$) respectively, but soil EC was not significant to 0.2704 ($r$). In 2011, soil water was significant to $0.3394^*$ ($r$), but soil temperature and soil EC were not significant to 0.2138 ($r$) and 0.2462 ($r$) respectively. Also, $NO_3$-N and soil nitrogen ($NO_3-N+NH_4-N$) were not significant to 0.0575 ($r$) and 0.0787 ($r$) respectively. During the carrot cultivation period, the average emissions factor released by the nitrogen fertilizer application for 2 years was presumed to be 0.0025 $N_2O$-N kg / N kg. This factor was 4 times than the IPCC (0.0100 $N_2O$-N kg / N kg) factor.

본 연구는 당근 재배 화산회 토양에서 질소시비 수준 및강우, 온도 환경 변화에 따른 $N_2O$ 발생 양상 특성 구명하기 위하여 제주특별자치도농업기술원 시험포장에서 2년간(2010~2011년) 수행되었다. 당근 재배기간 동안 $N_2O$ 배출량은 질소시비량이 많을수록 많았다. 대체적으로 $N_2O$ 배출량은 강우량 많은 시기인 재배 초기와 중기에 많았으나, 강우가 적고 한발 시기인 재배 말기에는 매우 적거나 거의 없는 경향을보였다. $N_2O$ 배출 양상은 강우 패턴 및 토양수분함량 변화와 대체로 유사한 경향을 보였다. $N_2O$ 배출량과 상관관계($r$)를 분석한 결과, '10년도에는 토양수분, 토양온도는 각각 $0.5718^{**}$, $0.4908^{**}$로 유의성이 인정되었으나, 토양 EC는 0.2704로 유의성은 인정되지 않았다. '11년도에는 토양수분은 $0.3394^*$로 유의성이 인정되었으나, 토양온도와 토양 EC는 각각 0.2138, 0.2462로 유의성은 인정되지 않았다. $NO_3$-N 및 토양 질소($NO_3-N+NH_4-N$)와는 각각 0.0575, 0.0787로 유의성이 인정되지 않았다. 당근 재배기간 동안 질소시비량에 의하여 배출된 2개년 평균 배출계수는 0.0025 $N_2O$-N kg / N kg으로 추정되었으며, IPCC (0.0100 $N_2O$-N kg / N kg) 배출계수 보다 약 4배 낮았다.

Keywords

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