Nitrous oxide emission factor from cattle urine and dung in native grassland of the Pampa biome, South Brazil
Janquieli Schirmann A , Diego Fernandes de Bastos A , Douglas Adams Weiler A , Murilo G. Veloso
A , Jeferson Dieckow B , Paulo Cesar de Faccio Carvalho C and Cimélio Bayer A D E
+ Author Affiliations
- Author Affiliations
A Graduate Program on Soil Science, Federal University of Rio Grande do Sul (UFRGS), 7712 Bento Gonçalves Avenue, 91540-000, Porto Alegre, RS, Brazil.
B Department of Soil Science and Agricultural Engineering, Federal University of Paraná, 1540, Funcionários St., 80035-050, Curitiba, PR, Brazil.
C Department of Agrometeorology and Forages, UFRGS, 7712 Bento Gonçalves Avenue, 91540-000, Porto Alegre, RS, Brazil.
D Department of Soil Science, UFRGS, 7712 Bento Gonçalves Avenue, 91540-000, Porto Alegre, RS, Brazil.
E Corresponding author: Email: cimelio.bayer@ufrgs.br
Soil Research 58(2) 198-206 https://doi.org/10.1071/SR19095
Submitted: 27 April 2019 Accepted: 29 October 2019 Published: 9 December 2019
Abstract
Native grassland supports extensive livestock production in the Pampas of South America, but the impact of cattle excreta on nitrous oxide (N2O) emissions remains unknown in this biome. The objective of this study was to determine the N2O emission factor (EF-N2O, % of N applied that is emitted as N2O) for urine and dung from beef cattle grazing on native grasslands. A field trial was conducted under low and moderate forage allowances (FA4 and FA12; i.e. 4 and 12 kg dry matter/100 kg live weight respectively) during the 30th year of a long-term grassland experiment on a Typic Paleudult in South Brazil. Urine and dung were applied onto separate patches, at rates equivalent to one average urination or defecation; and N2O fluxes were monitored with closed static chambers over 338 days. In adjacent microplots receiving the same excreta treatment, water-filled pore space, nitrate, ammonium and extractable dissolved organic carbon were monitored in the top 0.1 m of soil. Averaged across the forage allowances, daily soil N2O fluxes were low in the control without excreta (1.3 g N ha–1), but increased upon application of dung (3.8 g N ha–1) and urine (66 g N ha–1). The annual N2O emission and the EF-N2O for urine were greater under FA12 than FA4, but no difference was observed for dung. The positive relationships between N2O-N emissions and ammonium intensity and nitrate intensity suggest that N2O may have been produced concurrently by nitrification, nitrifier/denitrification and denitrification. On average, the EF-N2O was almost 10 times higher for urine than for dung (0.74% vs 0.08%), both much lower than the IPCC’s Tier 1 default value of 2%. Our findings reinforce the need for disaggregating the EF-N2O for urine and dung and of revising the IPCC’s Tier 1 EF-N2O.
Additional keywords: cattle excreta, forage allowance, livestock, N2O, subtropical.
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