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Evaluation of N2O Emissions with Different Growing Periods (Spring and Autumn Seasons), Tillage and No Tillage Conditions in a Chinese Cabbage Field

배추의 재배시기와 경운 유.무에 따른 아산화질소 배출 평가

  • 김건엽 (농촌진흥청 국립농업과학원) ;
  • 정현철 (농촌진흥청 국립농업과학원) ;
  • 심교문 (농촌진흥청 국립농업과학원) ;
  • 이슬비 (농촌진흥청 국립농업과학원) ;
  • 이덕배 (농촌진흥청 국립농업과학원)
  • Received : 2011.11.18
  • Accepted : 2011.12.12
  • Published : 2011.12.31

Abstract

Importance of climate change and its impact on agriculture and environment has increased with a rise of greenhouse gases (GHGs) concentration in Earth's atmosphere. Nitrous oxide ($N_2O$) emission in upland fields were assessed in terms of emissions and their control at the experimental plots of National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA) located in Suwon city. It was evaluated $N_2O$ emissions with different growing periods (spring and autumn seasons), tillage and no tillage conditions in a chinese cabbage field. The results were as follows: 1) An amount of $N_2O$ emissions were high in the order of Swine manure compost>NPK>Hairy vetch+N fertilizer. By tillage and no tillage conditions, $N_2O$ emissions were reduced to 33.7~51.8% (spring season) and 31.4~76.7% (autumn season) in no-tillage than tillage conditions. 2) In autumn season than those spring season, $N_2O$ emissions at NPK, hairy vetch+N fertilizer and swine manure compost were reduced to 49.6%, 39.0% and 60.0%, respectively, in tillage treatment and 59.5%, 70.6% and 58.7%, respectively, in no-tillage treatment. 3) $N_2O$ emission measured in this study was 15.2~86.4% lower with tillage and no tillage treatments than that of the IPCC default value (0.0125 kg $N_2O$-N/kg N).

밭에서 $N_2O$ 배출에 영향을 주는 요인 중 토양온도의 특성을 파악하고, 이러한 요인들이 $N_2O$ 배출에 얼마나 영향을 주는지를 정량적으로 밝히고자, 수원시에 위치한 국립농업과학원 기후변화생태과 시험포장에서 $N_2O$ 배출 시험을 수행하였다. 배추 재배에서 경운 유 무와 재배시기에 따라 NPK, 헤어리베치+N, 돈분퇴비를 처리하여 $N_2O$ 배출에 미치는 영향을 조사하고, 이에 대한 결과를 배출계수로 산출하여 IPCC default 값 (기후변화에 관한 정부간 협의체; Intergovernmental Pannel on Climate Change)과 비교 결과는 다음과 같다. 1) 질소질원별 재배기간 2년 평균 (2009~2010) $N_2O$의 총 배출량은 돈분퇴비>NPK>헤어리베치+N 비료 처리 순으로 나타났으며, 경운 유 무에 따른 $N_2O$ 배출은 경운에 비해 무경운에서 33.7~51.8% (봄재배) 그리고 31.4~76.7% (가을재배)가 저감되었다. 2) 재배시기별로는 가을배추재배는 봄재배 보다 $N_2O$ 배출량이 경운처리 NPK 49.6%, 헤어리베치+N 비료 39.0%, 돈분퇴비 처리에서 60% 감소하였고, 무경운 처리에서는 각각 59.5%, 70.6, 58.7%가 감소하였다. 3) 봄과 가을배추 재배지에서 측정한 모든 처리의 $N_2O$ 배출계수가 IPCC default 값인 0.0125 kg $N_2O$-N/kg N (현재 우리나라 온실가스 배출량 산정에 적용)보다 15.2~86.4% 적었다.

Keywords

References

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