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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  

Kim, Gun-Yeob (National Academy of Agricultural Science(NAAS), RDA)
Song, Beom-Heon (Chungbuk National University)
Roh, Kee-An (National Academy of Agricultural Science(NAAS), RDA)
Hong, Suk-Young (National Academy of Agricultural Science(NAAS), RDA)
Ko, Byung-Gu (National Academy of Agricultural Science(NAAS), RDA)
Shim, Kyo-Moon (National Academy of Agricultural Science(NAAS), RDA)
So, Kyu-ho (National Academy of Agricultural Science(NAAS), RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.41, no.6, 2008 , pp. 399-407 More about this Journal
Abstract
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($CH_4$) and nitrous oxide($N_2O$) 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. $N_2O$ emission during pepper growing period was reduced to 74.0~82.1% in sandy loam soil compared with those in clay loam soil. Evaluating $N_2O$ emission at different levels of soil water conditions, $N_2O$ 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. $CH_4$ emission was reduced to 45.7~61.6% in sandy loam soil compared with those in clay loam soil. Evaluating $CH_4$ at different levels of soil water conditions, $CH_4$ 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 $N_2O$ 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.
Keywords
$N_2O$; $CH_4$; emissions; Soil water potential; Mineral N; Soil temperature; Soil texture;
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Times Cited By KSCI : 1  (Citation Analysis)
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