한국환경농학회지 (Korean Journal of Environmental Agriculture)

  • 제30권3호
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  • Pages.243-251
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  • 2011
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  • 1225-3537(pISSN)
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  • 2233-4173(eISSN)
한국환경농학회 (The Korean Society of Environmental Agriculture)
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간척지 논 토양 개량제로서 석고처리가 메탄 배출량 저감에 미치는 영향

Effect of Gypsum Application on Reducing Methane (CH4) Emission in a Reclaimed Coastal Paddy Soil

  • 임창현 (경상대학교 응용생명과학부 (BK 21 program)) ;
  • 김상윤 (경상대학교 응용생명과학부 (BK 21 program)) ;
  • 김필주 (경상대학교 응용생명과학부 (BK 21 program))
  • Lim, Chang-Hyun (Division of Applied Life Science (BK 21 Program), Gyeongsang National University) ;
  • Kim, Sang-Yoon (Division of Applied Life Science (BK 21 Program), Gyeongsang National University) ;
  • Kim, Pil-Joo (Division of Applied Life Science (BK 21 Program), Gyeongsang National University)
  • 투고 : 2011.06.23
  • 심사 : 2011.09.09
  • 발행 : 2011.09.30
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초록

간척지 논 토양에서 석고의 처리는 염의 농도에 관계없이 고염도와 저염도 전체 토양에서 무처리 대비 71.3~98.9%까지 메탄 발생을 저감 할 수 있었다. 석고 처리에 따른 황산염을 증가는 전자수용체, 즉 황산염이온의 양 증대에 따른 전자의 활성저하와 황환원균의 활성증가가 메탄 발생을 저감시키는 가장 큰 요인인 것으로 판단된다. 간척지 논에 석고를 시용할 경우 부족한 칼슘의 공급효과를 통하여 토양의 물리성 및 배수 개선을 통하여 메탄 발생 감소에 영향을 줄 수 있었다. 또한 석고의 시용은 간척지 토양의 높은 pH와 높은 나트륨 이온을 효과적으로 저감할 수 있어 식물 생육 및 수량에 긍정적인 영향을 주었으며, 물리성 개선을 통하여 메탄 발생을 저감 시킬 수 있었다. 간척지 토양에서 석고의 시용은 벼 수량을 13.2~39.1%까지 증수 효과가 있었으나, 과량 처리시 오히려 생산성을 감소시켰다. 결론적으로 간척지에서 토양 개량을 위해 사용되어 지는 석고는 토양의 물리 화학성을 개선할 뿐만 아니라 메탄 발생을 효과적으로 저감할 수 있는 우수한 토양 개량제로서 평가되었다.

BACKGROUND: Gypsum($CaSO_4{\cdot}2H_2O$) is known as an ideal amendment to improve soil quality of the reclaimed coastal land. Since gypsum has very high concentration of electron acceptor like ${SO_4}^{2-}$, its application might be effective on reducing $CH_4$ emission during rice cultivation, but its effect has not been studied well. METHODS AND RESULTS: The effect of gypsum on $CH_4$ emission and rice growth characteristics was studied by pot test, which was packed by reclaimed paddy soils collected from Galsa, Hadong, Gyeongnam province. Chemical-grade gypsum was applied in two soils having EC 2.25 and 9.48 dS/m at rates of 0, 0.5, 1.0 and 2.0%(wt/wt). $CH_4$ emission was characterized a week interval by closed chamber method during rice cultivation. $CH_4$ emission rate was significantly decreased with increasing salt accumulation and gypsum application levels. With increasing gypsum application, dissolved ${SO_4}^{2-}$ concentration in the leachate water was significantly increased, which might have suppressed $CH_4$ production in soil. Total $CH_4$ flux was dramatically decreased with increasing gypsum application. In contrast, rice yield was increased with increasing gypsum application and then achieved maximum productivity at 1.0% gypsum application in two soils. CONCLUSION(s): Gypsum is a very good soil amendment to suppress $CH_4$ emission in reclaimed coastal paddy soils, and improve rice productivity and soil properties. The optimum application level of gypsum is assumed at ca. 1% to improve soil productivity with reducing effectively $CH_4$ emission during rice cultivation.

키워드

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피인용 문헌

  1. Effect of Salt Concentration on Methane Emission in a Coastal Reclaimed Paddy Soil Condition: Pot Test vol.32, pp.4, 2013, https://doi.org/10.5338/KJEA.2013.32.4.252
  2. Effect of gypsum on exchangeable sodium percentage and electrical conductivity in the Daeho reclaimed tidal land soil in Korea—a field scale study 2016, https://doi.org/10.1007/s11368-016-1446-x
  3. Effect of By-Product Gypsum Fertilizer on Methane Gas Emissions and Rice Productivity in Paddy Field vol.49, pp.1, 2016, https://doi.org/10.7745/KJSSF.2016.49.1.030