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Emissons and key-driving variables controling greenhouse gases emissions by goats, horses and sheeps in grasslands

Abstract

Brazil has a huge herd of goats, sheep and horses and currently the emission of greenhouse gases (GHG) is estimated through default emission factors of the intergovernmental panel for climate change (IPCC). Similarly, the impact of excreta characteristics and effects of key variables on GHG production was little studied in tropical grasslands. The objective of this project is to quantify the emission of GHG by excreta from goats, sheep and horses, to evaluate the effect of faecal chemical composition on methane (CH4) and nitrous oxide (N2O) fluxes, to measure volatilization of NH3 derived from excreta, the diurnal variation of GHG in 3 land use systems (agriculture, pasture and forest) and the sensitivity of gas fluxes to temperature variation in pastures managed under different grazing intensities. In order to achieve the objectives, six experiments will be conducted in the field and in the laboratory to measure GHG production. Experiment 1 will have the following treatments: faeces and urine of goats and sheep, the 2: feces, urine and bed of horses; the 3: bovine, horses, goats and sheep feces; the 4: NH3 evaluation of goat, equine and ovine excreta, the 5: evaluation of diurnal GEE variation in 3 treatments (agriculture, forest and pasture) and in the 6: evaluation of the effect of temperature variation on GHG fluxes in pastures on different intensities of grazing. (AU)

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