Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Effects of Barley Straw Management Practices on Greenhouse Gases(GHGs) Emission During Rice Cultivation in Rice-barley Double Cropping System

벼보리 이모작 재배에서 보리짚 처리 방법이 벼재배시 온실가스 배출에 미치는 영향

  • Ko, Jee-Yeon (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Lee, Jae-Saeng (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Jung, Ki-yul (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Choi, Young-Dae (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Ramos, Edwin P (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Yun, Eul-Soo (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Kang, Hwang-Won (National Institute of Crop Science, Yeongnam Agricultural Research Institute) ;
  • Park, Seong-Tae (National Institute of Crop Science, Environment and Biotechnology Division)
  • Received : 2008.01.18
  • Accepted : 2008.02.13
  • Published : 2008.02.28
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Abstract

Because main barley straw management is changing these days from off-fields to burning that may relate to air quality concerning the global warming, this study was conducted to investigate the effects of barley-straw management practices on greenhouse gas emissions during rice cultivation in rice-barley double cropping system. The treatments were barley straw burning, off-field usage of barley straw and incorporation of barley straw in paddy fields. Laboratory experiment showed that burning of barley straw at the rate of $4.5Mg\;ha^{-1}$ emitted GHGs in the amounts of 4,607, 19.5, and $0.9kg\;ha^{-1}$ of $CO_2$, $CH_4$, and $N_2O$, respectively. During the rice cultivation of the rice-barley double cropping system, the highest GHG emission by evaluated close-static chamber method was observed from the soil incorporation of barley straw with 387 and $1.0kg\;ha^{-1}$ of $CH_4$ and $N_2O$, respectively. The GHGs emissions from the barley straw burning and off-field usage treatments were 233 and $160kg\;ha^{-1}$ for $CH_4$ and 0.80 and $0.79kg\;ha^{-1}$ for $N_2O$, respectively. The barley straw burning treatment showed the greatest GHGs emission among barley straw management practices in rice-barley double cropping system when considering GHGs emissions both during burning and from paddy fields during the cropping seasons. As a result, the GHGs emissions recorded in the barley straw incorporation to soil and off-field usage treatments were 22.4 and 66.8%, respectively, less than sum of GHGs emissions from the burning of barley straw and from paddy fields during rice cultivation.

벼-보리 이모작 재배시 발생하는 보릿짚은 예전에는 포장에서 수거되어 땔감이나 우사의 깔집 등으로 주로 이용되었으나 농촌 노동력 부족으로 인하여 소각이나 토양혼입 등으로 처리방법이 바뀜에 따라 농업생태계에 미치는 영향이 커지고 있다. 따라서 벼-보리 이모작 재배시 주요 보릿짚 처리방법인 소각, 논으로부터 제거, 토양 내 혼입 처리에 따른 온실가스 발생량을 구명하여 보릿짚 처리방법이 온실가스 배출에 미치는 영향을 밝히고자 시험을 수행하였다. 보릿짚의 소각($4.5Mg\;ha^{-1}$)시 발생하는 온실가스 발생량은 $CO_2\;4,607kg\;ha^{-1}$, $CH_4\;19.5kg\;ha^{-1}$, $N_2O\;0.9kg\;ha^{-1}$ 로 $CO_2$의 발생량이 가장 많았으며 이는 보릿짚내 총 탄소함량의 45~55%에 해당하였다. 각각의 보릿짚 처리 후 논에서 배출되는 온실가스량은 $CH_4\;387kg\;ha^{-1}$, $N_2O\;1.0kg\;ha^{-1}$로 보릿짚이 토양에 혼입된 논토양에서 발생량이 가장 많았으며, 다음으로 소각처리한 논토양과 포장 밖으로 제거 처리한 논의 순이었다. 보릿짚 처리방법이 온난화가스 배출에 미치는 영향을 소각시 발생한 양 및 논토양에서 배출되는 양을 합하여 지구온난화지수(GWP)로 계산한 결과, 소각시 $10,880CO_2\;kg\;ha^{-1}$, 토양혼입시 $8,439CO_2\;kg\;ha^{-1}$, 포장 밖 제거시 $3,614CO_2\;kg\;ha^{-1}$의 온실가스가 발생하여 소각처리에 비해 토양혼입과 포장 밖 제거시 각각 22.4%와 66.8%의 온실가스 배출량이 감소하였다.

Keywords

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