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A 3-year assessment of nitrous oxide emission factors for urine and dung of grazing sheep in a subtropical ecosystem

  • Soils, Sec 5 • Soil and Landscape Ecology • Research Article
  • Published:
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Abstract

Purpose

Grazing livestock has strong impact on global nitrous oxide (N2O) emissions by providing N sources through excreta. The scarcity of information on factors influencing N2O emissions from sheep excreta in subtropical ecosystems such as those of Southern Brazil led us to conduct field trials in three different winter pasture seasons on an integrated crop–livestock system (ICL) in order to assess N2O emission factors (EF-N2O) in response to variable rates of urine and dung.

Materials and methods

The equivalent urine-N loading rates for the three winter seasons (2009, 2010, and 2013) ranged from 96 to 478 kg ha−1, and the dung-N rates applied in 2009 and 2010 were 81 and 76 kg ha−1, respectively. Air was sampled from closed static chambers (0.20 m in diameter) for approximately 40 days after excreta application and analyzed for N2O by gas chromatography.

Results and discussion

Soil N2O-N fluxes spanned the ranges 4 to 353 μg m−2 h−1 in 2009, − 47 to 976 μg m−2 h−1 in 2010, and 46 to 339 μg m−2 h−1 in 2013. Urine addition resulted in N2O-N peaks within for up to 20–30 days after application in the 3 years, and the strength of the peaks was linearly related to the N rate used. Emission factors of N2O (EF-N2O, % of N applied that is emitted as N2O) of urine ranged from 0.06 to 0.34% and were essentially independent of N rate applied. By considering a ratio of N excreted by urine and dung of 60:40, a single combined excretal EF-N2O of 0.14% was estimated.

Conclusions

Our findings showed higher mean EF-N2O for sheep urine than that for dung (0.21% vs 0.03%), irrespective of the occurrence or not of urine patches overlap. This value is much lower than default value of 1% of IPCC’s Tier 1 and reinforces the needs of its revision.

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Funding

This work was funded by the Brazilian National Council for Scientific and Technological Development (CNPq) and the Research Support Foundation of the Rio Grande do Sul state (FAPERGS).

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Authors and Affiliations

  1. Department of Soil Science and Graduate Program on Soil Science, Faculty of Agricultural and Life Sciences, Federal University of Rio Grande do Sul, 91540-000, 7712 Bento Goncalves Ave., Porto Alegre, RS, Brazil

    Diego Fernandes de Bastos, Emanuelle Cavazini Magiero, Michely Tomazi, Janquieli Schirmann, Murilo G. Veloso, Paulo César de Faccio Carvalho & Cimélio Bayer

  2. Secretary for Rural Development and Cooperativism of Rio Grande do Sul State, 90110-000, Praia de Belas Ave., 1768, Porto Alegre, RS, Brazil

    Emanuelle Cavazini Magiero

  3. Brazilian Agricultural Research Corporation (Embrapa Agropecuary West), 79804-970, Rod. BR 163, Km 253,6, Dourados, MS, Brazil

    Michely Tomazi

  4. Grazing Ecology Research Group, Faculty of Agricultural and Life Sciences, Federal University of Rio Grande do Sul, 91540-000, 7712 Bento Goncalves Ave., Porto Alegre, RS, Brazil

    Paulo César de Faccio Carvalho

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  1. Diego Fernandes de Bastos
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  2. Emanuelle Cavazini Magiero
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  6. Paulo César de Faccio Carvalho
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Correspondence to Cimélio Bayer.

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Responsible editor: Jizheng He

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de Bastos, D.F., Magiero, E.C., Tomazi, M. et al. A 3-year assessment of nitrous oxide emission factors for urine and dung of grazing sheep in a subtropical ecosystem. J Soils Sediments 20, 982–991 (2020). https://doi.org/10.1007/s11368-019-02456-7

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