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Ecosystems

, Volume 20, Issue 4, pp 845–859 | Cite as

Impact of Grazing Intensity and Seasons on Greenhouse Gas Emissions in Tropical Grassland

  • Abmael da Silva CardosoEmail author
  • Liziane de Figueiredo Brito
  • Estella Rosseto Janusckiewicz
  • Eliane da Silva Morgado
  • Rondineli Pavezzi Barbero
  • Jefferson Fabiano Werner Koscheck
  • Ricardo Andrade Reis
  • Ana Cláudia Ruggieri
Article

ABSTRACT

Greenhouse gases (GHG) can be affected by grazing intensity, soil, and climate variables. This study aimed at assessing GHG emissions from a tropical pasture of Brazil to evaluate (i) how the grazing intensity affects the magnitude of GHG emissions; (ii) how season influences GHG production and consumption; and (iii) what are the key driving variables associated with GHG emissions. We measured under field conditions, during two years in a palisade-grass pasture managed with 3 grazing intensities: heavy (15 cm height), moderate (25 cm height), and light (35 cm height) N2O, CH4 and CO2 fluxes using static closed chambers and chromatographic quantification. The greater emissions occurred in the summer and the lower in the winter. N2O, CH4, and CO2 fluxes varied according to the season and were correlated with pasture grazing intensity, temperature, precipitation, % WFPS (water-filled pores space), and soil inorganic N. The explanatory variables differ according to the gas and season. Grazing intensity had a negative linear effect on annual cumulative N2O emissions and a positive linear effect on annual cumulative CO2 emissions. Grazing intensity, season, and year affected N2O, CH4, and CO2 emissions. Tropical grassland can be a large sink of N2O and CH4. GHG emissions were explained for different key driving variables according to the season.

Keywords

grassland management grazing height CH4 from grassland soil soil respiration water-filled pore space nitrous oxide 

Notes

Acknowledgments

This work is funded by the “São Paulo Research Foundation” (Fapesp grants # 2011/00060-8, # 2012/06718-8, # 2012/14956-6, # 2012/04605-1). The authors ASC, ESM, and RPB thank FAPESP for their scholarships. The authors ACR, LFB, ERJ, and RAA be grateful the Conselho Nacional de Desenvolvimento Científico Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the scholarships. The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of this paper and to Publicase, for the assistance with proofreading the article.

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Departamento de Zootecnia, Faculdade de Ciências Agrárias e VeterináriasUNESP – Univ Estadual PaulistaJaboticabalBrazil
  2. 2.Uberlandia Federal UniversityUberlândiaBrazil
  3. 3.Universidade Estadual Paulista Julio de Mesquita Filho Via de Acesso Prof Paulo Donato Castellane UNESPSao PauloBrazil

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