A snapshot of greenhouse gas emissions from a cattle feedlot.
Bai, M., Flesch, T.K., McGinn, S.M., and Chen, D. (2015). "A snapshot of greenhouse gas emissions from a cattle feedlot.", Journal of Environmental Quality, 44(6), pp. 1974-1978. doi : 10.2134/jeq2015.06.0278 Access to full text
Beef cattle feedlots emit large amounts of the greenhouse gases (GHG) methane (CH4) and nitrous oxide (N2O), as well as ammonia (NH3), which contributes to N2O emission when NH3 is deposited to land. However, there is a lack of simultaneous, in situ, and nondisturbed measurements of the major GHG gas components from beef cattle feedlots, or measurements from different feedlot sources. A short-term campaign at a beef cattle feedlot in Victoria, Australia, quantified CH4, N2O, and NH3 emissions from the feedlot pens, manure stockpiles, and surface run-off pond. Open-path Fourier transform infrared (OP-FTIR) spectrometers and open-path lasers (OP-Laser) were used with an inverse-dispersion technique to estimate emissions. Daily average emissions of CH4, N2O, and NH3 were 132 (± 2.3 SE), 0, and 117 (± 4.5 SE) g animal-1 d-1 from the pens and 22 (± 0.7 SE), 2 (± 0.2 SE), and 9 (± 0.6 SE) g animal-1 d-1 from the manure stockpiles. Emissions of CH4 and NH3 from the run-off pond were less than 0.5 g animal-1 d-1. Extrapolating these results to the feedlot population of cattle across Australia would mean that feedlots contribute approximately 2% of the agricultural GHG emissions and 2.7% of livestock sector emissions, lower than a previous estimate of 3.5%. Core Ideas: • Open-path spectroscopy/inverse-dispersion technique is applied in this study. • Quantifies CH4, N2O, and NH3 emissions from a large-scale, intensive feedlot. • Investigates emission contributions from pens, manure stockpiles, and run-off ponds. • Discusses the diurnal variation in CH4, N2O, and NH3 emissions. • Estimates the total GHG emissions from the whole-feedlot
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