Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Fertilizer and Organic Inputs Effects on CO2 and CH4 Emission from a Soil under Changing Water Regimes

토양 수분 변동 조건에서 시비 및 유기물 투입에 따른 CO2와 CH4 방출 특성

  • Lim, Sang-Sun (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Choi, Woo-Jung (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Kim, Han-Yong (Department of Applied Plant Science, Chonnam National University)
  • 임상선 (전남대학교 지역.바이오시스템공학과) ;
  • 최우정 (전남대학교 지역.바이오시스템공학과) ;
  • 김한용 (전남대학교 식물생명공학부)
  • Received : 2012.05.18
  • Accepted : 2012.06.25
  • Published : 2012.06.30
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Abstract

BACKGROUND: Agricultural inputs (fertilizer and organic inputs) and water conditions can influence $CH_4$ and $CO_2$ emission from agricultural soils. This study was conducted to investigate the effects of agricultural inputs (fertilizer and organic inputs) under changing water regime on $CH_4$ and $CO_2$ emission from a soil in a laboratory incubation experiment. METHODS AND RESULTS: Four treatments were laid out: control without input and three type of agricultural inputs ($(NH_4)_2SO_4$, AS; pig manure compost, PMC; hairy vetch, HV). Fertilizer and organic inputs were mixed with 25 g of soil at 2.75 mg N/25 g soil (equivalent to 110 kg N/ha) in a bottle with septum, and incubated for 60 days. During the first 30-days incubation, the soil was waterlogged (1 cm of water depth) by adding distilled water weekly, and on 30 days of incubation, excess water was discarded then incubated up to 60 days without addition of water. Based on the redox potential, water regime could be classified into wetting (1 to 30 days), transition (31 to 40 days), and drying periods (41 to 60 days). Across the entire period, $CH_4$ and $CO_2$ flux ranged from 0 to 13.8 mg $CH_4$/m/day and from 0.4~1.9 g $CO_2$/m/day, and both were relatively higher in the early wetting period and the boundary between transition and drying periods. During the entire period, % loss of C relative to the initial was highest in HV (16.4%) followed by AS (8.1%), PMC (7.5%), and control (5.4%), indicating readily decomposability of HV. Accordingly, both $CH_4$ and $CO_2$ fluxes were greatest in HV treatment. Meanwhile, the lower $CH_4$ flux in AS and PMC treatments than the control was ascribed to reduction in $CH_4$ generation due to the presence of oxidized compounds such as ${SO_4}^{2-}$, $Fe^{3+}$, $Mn^{4+}$, and ${NO_3}^-$ that compete with precursors of $CH_4$ for electrons. CONCLUSION: Green manure such as HV can replace synthetic fertilizer in terms of N input, however, it may increase $CH_4$ emission from soils. Therefore, co-application of green manure and livestock manure compost needs to be considered in order to achieve satisfactory N supply and to mitigate $CH_4$ and $CO_2$ emission.

논 생태계를 모의하여 토양에 투입된 비료의 종류(AS, PMC, HV)와 토양 수분 변동조건(습윤기간, 전이기간, 건조 기간)으로 구분하여 $CH_4$과 $CO_2$ 플럭스를 조사하였다. $CH_4$ 플럭스는 0~13.8 mg $CH_4$/m/day의 범위에서 변화하였으 며, 시기적으로 습윤기간 초기와 전이기간과 건조기간 경계 시점에서 높은 값을 보였다. $CO_2$ 플럭스는 습윤 초기에 최대 치를 보이고 지속적으로 감소하다가 전이기간에 다시 상승하 였다. 최종토양의 탄소함량 변화는 대조구에서-5.4%이었고, 비료 처리구에서는-7.5~-16.4%이었다. HV 시용은 타 비종 에 비해 $CH_4$과 $CO_2$ 플럭스를 증가시켰는데, 이는 녹비작물 이 가축분 퇴비에 비해 상대적으로 이분해성으로 배양 초기 에 유기물 분해에 의해 $CH_4$과 $CO_2$ 발생량이 높았기 때문이 다. AS나 PMC 처리구에서 $CH_4$ 플럭스가 대조구에 비해 낮았는데, 이는 AS의 ${SO_4}^{2-}$와 퇴비에 함유된 산화형 물질($Fe^{3+}$, $Mn^{4+}$, ${NO_3}^-$)과 같은 전자 수용체에 의해 습윤기간 중 이들 물질이 전자수용체로 활용되어 $CH_4$ 생성이 감소할 수 있음 을 의미한다. PMC와 HV의 탄소 손실률을 비교하면, HV와 같은 이분해성 유기물에 비해 PMC와 같은 난분해성 유기물 의 시용이 토양 탄소량을 증가시키는 것으로 나타났다. 또한, 본 연구는 HV와 같은 녹비 작물이 질소 공급의 측면에서 화 학비료를 대체할 수 있지만, 화학비료 시용에 비해 $CH_4$ 발생 이 증가할 수 있음을 제시한다. 따라서, 이분해성 유기물(녹비 작물)과 난분해성 유기물(가축분퇴비)을 혼합 시용할 경우 양 분공급과 탄소저장량 증대에 모두 유리할 것으로 기대된다.

Keywords

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