The Patterns of CH₄ and N₂O fluxes from used Litter Stockpile from Korean Native Cattle (Hanwoo)
2012
Park, K.H., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Choi, D.Y., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Yoo, Y.H., National Institute of Animal Science, RDA, Suwon, Republic of Korea
This study was conducted to measure methane (CH₄) and nitrous oxide (N₂O) emissions from the 6 month old litter stockpile used for korean native cattle (Hanwoo) from August 3, 2007 to October 4, 2007. Daily mean CH₄ emissions was peaked to 273.013 ㎍ m-² s-¹ (SE : ±1.047 ㎍ m-² s-¹) on first day and then gradually decreased to 2.309 ㎍ m-² s-¹ (SE :±0.061 ㎍ m-² s-¹) at the end of this experiment. Daily mean N₂O emissions was as little as 0.269 ㎍ m-² s-¹ (SE : ±0.018 ㎍ m-² s-¹) on first day, but exponentially increased up to 3.569 ㎍ m-² s-¹ (SE : ±0.454 ㎍ m-² s-¹ ) on 43rd day and then slowly decreased to 1.888 ㎍ m-² s-¹ (SE : ±0.012 ㎍ m-² s-¹) at the end of this experiment. Carbon dioxide equivalent (CO₂-eq), calculated by global warming potentials of CH₄ or N₂O, of CH₄ on first day occupied approximately 99% of sum of CO₂-eq of CH₄ and N₂O. Methane emissions decreased and N₂O emissions increased so that CO₂-eq ratio of CH₄ to N₂O was 50:50 on 34th day. The effect of N₂O on the ratio was increase thereafter. The ratio of daily mean CH₄ and N₂O emissions to daily error of the mean was calculated to find daily fluctuation of CH₄ and N₂O emissions. The ratio of CH₄ was less than 1.0% till 11th day but increased to 10.9% on 57th day. The ratio of N₂O (0.4%~51.0%) was higher than that of CH₄, showing high in early stage and then gradually decrease, which was different from the pattern of CH₄. The ratio of daily mean emissions to daily error of the mean was little in case of active CH₄ or N₂O generation period, which would be caused by the temporal and spatial heterogeneity of composting process. Hence more air supply on early stage to decrease CH₄ generation and proper turning to reduce spatial heterogeneity are needed to mitigate greenhouse gas emissions.
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