김제 보리-벼 이모작지에서의 순 생물상생산량의 추정 = Estimation of Net Biome Production in a Barley-Rice Double Cropping Paddy Field of Gimje, Korea

국문 초록 (Abstract)

본 연구는 보리-벼 이모작 작부체계의 논 생태계에 설치한 개방형 CO2 플럭스시스템과 자동개폐식 챔버형 CH4 측정시스템에서 관측된 탄소관련 온실가스 자료와 작물 생장량자료를 활용하여 논 생태계의 연간(2012.10.20~2013.10.21) 탄소수지를 분석하였다. 결론적으로 농작물의 생육인자와 환경인자는 CO2의 순 생태계교환량(NEE)에 영향을 주는 것으로 분석되었고, CH4 배출량은 영농활동(특히 물관리)에 따라 큰 영향을 받는 것으로 분석되었다. 2012~2013년 벼-보리 이모작 작부체계의 논 생태계에서 보리 재배기간에는 단위면적(m2)당 100.2g의 탄소를 흡수하고 벼 재배기간에는 m2당 374.1g의 탄소를 흡수하였지만, 휴경기간에는 토양호흡의 형태로 m2당 41.2g의 탄소를 배출하여 연간 총 433.1g m-2의 탄소를 흡수하는 것으로 분석되었다. 여기에 농작물의 수확에 따른 논 생태계의 탄소 배출량과 CH4 형태로배출되는 탄소량을 포함한 연간 순생물상생산량(NBP)은 184.7g C m-2으로 추정되어, 보리-벼 이모작 작부체계의 논 생태계는 탄소 발원인 것으로 평가되었다.

다국어 초록 (Multilingual Abstract)

Fluxes of carbon dioxide (CO2) were measured above crop canopy using the Eddy Covariance (EC) method, and emission rate of methane (CH4) was measured using Automatic Open/Close Chamber (AOCC) method during the 2012-2013 barley and rice growing season in a barley-rice double cropping field of Gimje, Korea. The net ecosystem exchange (NEE) of CO2 in the paddy field was analyzed to be affected by crop growth (biomass, LAI, etc.) and environment (air temperature, solar radiation, etc.) factors. On the other hand, the emission rate of CH4 was estimated to be affected by water management (soil condition). NEE of CO2 in barley, rice and fallow period was -100.2, -374.1 and +41.2g C m-2, respectively, and CH4 emission in barley and rice period was 0.2 and 17.3 g C m-2, respectively. When considering only CO2, the barley-rice double cropping ecosystem was estimated as a carbon sink (-433.0g C m-2). However, after considering the harvested crop biomass (+600.3 g C m-2) and CH4 emission (+17.5g C m-2), it turned into a carbon source (+184.7g C m-2).

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