Methane emissions from a dairy feedlot during the fall and winter seasons in Northern China
Gao, Z., Yuan, H., Ma, W., Liu, X., Desjardins, R.L. (2011). Methane emissions from a dairy feedlot during the fall and winter seasons in Northern China, 159(5), 1183-1189. http://dx.doi.org/10.1016/j.envpol.2011.02.003
Accurately determining methane emission factors of dairy herd in China is imperative because of China's large population of dairy cattle. An inverse dispersion technique in conjunction with open-path lasers was used to quantify methane emissions from a dairy feedlot during the fall and winter seasons in 2009-2010. The methane emissions had a significant diurnal pattern during both periods with three emission peaks corresponding to the feeding schedule. A 10% greater emission rate in the fall season was obtained most likely by the higher methane emission from manure during that period. An annual methane emission rate of 109 ± 6.7 kg CH4 yr-1 characterized with a methane emission intensity of 32.3 ± 1.59 L CH4 L-1 of milk and a methane conversion factor (Ym) of 7.3 ± 0.38% for mature cattle was obtained, indicating the high methane emission intensity and low milk productivity in Northern China. © 2011 Elsevier Ltd. All rights reserved.
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