An evaluation of four years of nitrous oxide fluxes after application of ammonium nitrate and urea fertilisers measured using the eddy covariance method
An evaluation of four years of nitrous oxide fluxes after application of ammonium nitrate and urea fertilisers measured using the eddy covariance method
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DOI：
10.1016/j.agrformet.2019.107812
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发表时间：
2020-01
影响因子：
6.2
通讯作者：
N. Cowan;P. Levy;J. Maire;M. Coyle;S. Leeson;D. Famulari;M. Carozzi;E. Nemitz;U. Skiba
中科院分区：
文献类型：
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作者：
N. Cowan;P. Levy;J. Maire;M. Coyle;S. Leeson;D. Famulari;M. Carozzi;E. Nemitz;U. Skiba
在这项研究中，我们提出了第一个长期的N2O涡动协方差数据集测量的工作农场。涡度协方差法被用来在四年的时间内，测量温室气体一氧化二氮（N2O）的通量从一个集中管理的放牧草地，定期应用硝酸铵或尿素肥料的传播，为两年，每个在现场。在这项研究中，在施肥后的30天内，硝酸铵和尿素肥料应用的平均排放因子（EF）分别为0.90%和1.73%的氮，个别事件的EF范围在0.13%和5.71%之间。我们的研究准确地量化了多个事件的排放因子，并明确地表明大规模的变化是真实的。EF确实因肥料事件而异，即使在类似环境条件下使用相同肥料类型的同一地点。这使得为了制定减排政策而区分不同肥料类型之间的EF非常困难。
In this study, we present the first long-term N2O eddy covariance dataset measured from a working farm. The eddy covariance method was used over a four year period to measure fluxes of the greenhouse gas nitrous oxide (N2O) from an intensively managed grazed grassland, to which regular applications of ammonium nitrate or urea fertilisers were spread, for two years each at the field site. The mean emission factors (EFs) reported for ammonium nitrate and urea fertiliser applications in this study over a period of 30 days after fertilisation, were 0.90 and 1.73% of the nitrogen applied, respectively, with EFs of individual events ranging between 0.13 and 5.71%. Our study accurately quantifies emission factors for multiple events and showing unambiguously that large-scale variability is real. EFs do indeed vary from one fertiliser event to another, even at the same site with the same fertiliser type under similar environmental conditions. This makes distinguishing EFs between different fertiliser types for the purposes of developing emission mitigation policy very difficult.