DNDC 모형을 이용한 시비와 영농관리에 따른 밭포장의 토양유기탄소 변동 평가
Evaluation of Soil Organic Carbon of Upland Soil According to Fertilization and Agricultural Management Using DNDC Model
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농업생태계에 대한 기후변화의 영향을 경감시키기 위해 토양탄소격리를 증대시키기 위한 영농관리기법 개발이 요구되고 있다. 본 연구에서는 토양유기탄소에 대한 비종(화학비료와 퇴비), 작부체계, 작물잔사관리의 영향을 조사하였다. 화학비료와 퇴비 시험포를 조성하여 자연 강우 조건에서 옥수수-보리를 2년동안 재배하고 토양내 SOC의 분석을 위해 토양샘플링을 실시하였다. 영농관리에 따른 SOC의 장기변화 패턴을 추정하기 위해 DNDC모형을 1981년부터 2010년까지 기상자료와 실험자료 기반 매개변수로 모의하였다. DNDC 모의에 의하면 화학비료 처리구에서는 작물잔사 환원이 없으면 SOC가 감소하는 것으로 나타났다. 반면 퇴비 처리구에서는 같은 조건에서 SOC가 증가하였고, SOC의 증가는 퇴비의 시비율에 비례하였다. 또한 SOC는 투입된 퇴비량의 증가로 인해 옥수수 단작보다 옥수수-보리 작부체계에서 더 증가하였다. 비종에 관계없이 작물잔사의 토양환원은 SOC 증가를 가져왔지만, 퇴비시용의 경우 잔사환원 효과는 작은 것으로 나타났다.
Abstract
To mitigate the impacts of climate change on agricultural ecosystems, development ofagricultural management for enhanced soil carbon sequestration is required. In this study, the effectsof fertilizer types (chemical fertilizer and manure compost), cropping systems, and crop residuemanagement on SOC(Soil Organic Carbon) sequestration were investigated. Summer corn andwinter barley were cultivated on experimental plots under natural rainfall conditions for two years with chemical fertilizer and manure compost. Soil samples were collected conducted and analyzedfor SOC for soil. To estimate long-term variation patterns of SOC, DNDC was run with theexperimental data and the weather input parameters from 1981 to 2010. DNDC simulation demonstrated SOC reduction by chemical fertilizer treatment unless plantresidues are returned; whereas compost treatments increased SOC under the same conditions andSOC increment was proportional to compost application rate. In addition, SOC further increasedunder corn-barley cropping system over single corn cropping due to more compost application. Regardless of nutrient input type, residue return increased SOC; however, the magnitude of SOCincrease by residue return was lower than by compost application.
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