Evaluation of Green House Gases Emissions According to Changes of Soil Water Content, Soil Temperature and Mineral N with Different Soil Texture in Pepper Cultivation
2008
Kim, G.Y. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea), E-mail: [email protected] | Song, B.H. (Chungbuk National University, Cheongju, Republic of Korea) | Roh, K.A. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Hong, S.Y. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Ko, B.G. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Shim, K.M. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | So, K.H. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea)
Importance of climate change and its impact on agriculture and environment has increased with a rise of greenhouse gases (GHGs) concentration in Earth's atmosphere, which had caused an increase of temperature in Earth. greenhouse gas emissions such as methane(CH₄) and nitrous oxide(N₂O) in the field need to be assessed. GHGs fluxes using chamber systems in the fields(2004~2005) with pepper cultivation were monitored at the experimental plots of National Academy of Agricultural Science(NAAS), Rural Development Administration(RDA) located in Suwon city. N₂O emission during pepper growing period was reduced to 74.0~82.1% in sandy loam soil compared with those in clay loam soil. Evaluating N₂O emission at different levels of soil water conditions, N₂O emission at -50 kPa were lowered to 13.2% in clay loam soil and 40.2% in sandy loam soil compared with those at -30 kPa. CH₄ emission was reduced to 45.7~61.6% in sandy loam soil compared with those in clay loam soil. Evaluating CH₄ at different levels of soil water conditions, CH₄ emission at -50 kPa was lowered to 69.6% in clay loam soil and 55.8% in sandy loam soil compared with those at -30 kPa. It implied that -50 kPa of soil water potential was effective for saving water and reducing GHG emissions. From the path analysis as to contribution factors for N₂O emission, it appeared that contribution rate was in the order of mineral N(51.2%), soil temperature(25.8%), and soil moisture content(23.0%) in clay loam soil and soil moisture content(39.3%), soil temperature(36.4%), and mineral N(24.3%) in sandy loam soil.
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