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http://dx.doi.org/10.14249/eia.2015.24.1.1

Evaluation of Soil Organic Carbon of Upland Soil According to Fertilization and Agricultural Management Using DNDC Model  

Lee, Kyoungsook (Dept. of Rural & Bio-systems Engineering, Chonnam National University)
Yoon, Kwangsik (Dept. of Rural & Bio-systems Engineering, Chonnam National University)
Choi, Dongho (Dept. of Rural & Bio-systems Engineering, Chonnam National University)
Jung, Jaewoon (Yeongsan River Environment Research Center)
Choi, Woojung (Dept. of Rural & Bio-systems Engineering, Chonnam National University)
Lim, Sangsun (Dept. of Rural & Bio-systems Engineering, Chonnam National University)
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Abstract
To mitigate the impacts of climate change on agricultural ecosystems, development of agricultural management for enhanced soil carbon sequestration is required. In this study, the effects of fertilizer types (chemical fertilizer and manure compost), cropping systems, and crop residue management on SOC(Soil Organic Carbon) sequestration were investigated. Summer corn and winter 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 analyzed for SOC for soil. To estimate long-term variation patterns of SOC, DNDC was run with the experimental data and the weather input parameters from 1981 to 2010. DNDC simulation demonstrated SOC reduction by chemical fertilizer treatment unless plant residues are returned; whereas compost treatments increased SOC under the same conditions and SOC increment was proportional to compost application rate. In addition, SOC further increased under 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 SOC increase by residue return was lower than by compost application.
Keywords
climate change; SOC; chemical fertilizer; compost; DNDC;
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