Characterizing CH4 and N2O emissions from an intensive dairy operation in summer and fall in China

Zhu, Gaodi; Ma, Xiaoyuan; Gao, Zhiling; Ma, Wenqi; Li, Jianguo; Cai, Zeyu

doi:10.1016/j.atmosenv.2013.11.001

Cited by 24 publications

(21 citation statements)

References 38 publications

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“…6) (Zhu et al, 2014). Differences between N 2 O fluxes in milking cows and heifers were attributed to manure management, with weekly manure removal from milking cow housing versus twice monthly removal for heifers.…”

Section: N 2 O Measurement Methodsmentioning

confidence: 99%

“…Using a novel approach, Zhu et al (2014) collected air samples through nine inlet ports along an 80-m length of polyethylene tubing at an open-lot dairy in China. Lineaveraged N 2 O concentrations were determined with a GC, and flux rates were calculated with the backward Lagrangian stochastic inverse dispersion technique (Flesch et al, 2009).…”

Section: N 2 O Measurement Methodsmentioning

confidence: 99%

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Nitrous Oxide Emissions from Open‐Lot Cattle Feedyards: A Review

et al. 2016

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Nitrous oxide (N 2 O) emissions from concentrated animal feeding operations, including cattle feedyards, have become an important research topic. However, there are limitations to current measurement techniques, uncertainty in the magnitude of feedyard N 2 O fluxes, and a lack of effective mitigation methods. The objective of this review was to assess N 2 O emission from cattle feedyards, including comparison of measured and modeled emission rates, discussion of measurement methods, and evaluation of mitigation options. ). This variation was due to inconsistency in measurement techniques as well as irregularity in N 2 O production and emission attributable to management, animal diet, and environmental conditions. Based on this review, it is clear that the magnitude and dynamics of N 2 O emissions from open-lot cattle systems are not well understood. Further research is required to quantify feedyard N 2 O fluxes and develop costeffective mitigation methods.

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Section: N 2 O Measurement Methodsmentioning

confidence: 99%

Section: N 2 O Measurement Methodsmentioning

confidence: 99%

Nitrous Oxide Emissions from Open‐Lot Cattle Feedyards: A Review

et al. 2016

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“…Also, the insertion and 528 removal of chambers during the sampling can cause 529 disruption and gas flux alteration (Rochette and 530 Eriksen-Hamel 2008;Parkin et al 2012). An inade-531 quate mixing of the headspace air, pressure changes, 532 and increase in headspace gas concentration can 533 affected the estimation of GHGs emission when static 534 chambers are used (Zhu et al 2014). Some modifica-535 tions in chamber characteristics and operation were 536 proposed by Parkin et al (2012).…”

mentioning

confidence: 99%

“…The air flux is estimated by 451 using dispersion models to describe the vertical 452 profiles. The main limitation of air flux measurements 453 is that the fluxes vary spatially, and differ from day-to-454 day and within the day in response to multiple factors 455 that regulate production, consumption and emission 456 the GHGs (Zhu et al 2014).…”

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confidence: 99%

“…It is considered that 212 long measurement time is required to reach a correct 213 estimation of gas emission, because there are signif-214 icant variations in gas concentrations and air exchange 215 rates. Zhu et al (2014), have proposed a methodology 216 for a minimum continuous sampling period of 3 days, 217 taking air samples during each hour to capture the 218 diurnal variations of CH 4 and N 2 O emission. Barton 219 et al (2015), reported a wide range analysis of the 220 uncertainties produced in N 2 O emission estimation 221 when the sampling frequency is not correctly defined.…”

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confidence: 99%

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