CO2 exchange under two different pasture management systems in the Pampa Biome
DOI:
https://doi.org/10.5902/2179460X84056Keywords:
Livestock, Greenhouse gases, Carbon balanceAbstract
Faced with the concerning scenario of increasing greenhouse gas (GHG) emissions associated with rising global temperatures, the United Nations Climate Conferences (COPs) have been discussing various strategies for countries to reduce these emissions. In Brazil, land use change — mainly through deforestation — and the agricultural sector are identified as the main sources of GHGs, primarily CO2 and CH4. However, studies have shown that livestock production in the natural grasslands of the Pampa biome, when practiced sustainably, can serve as an important carbon sink. In this study, different native pasture management practices in the Pampa biome were evaluated with respect to CO2 exchange between the surface and the atmosphere: continuous conservative grazing and rotational grazing. For this purpose, one year of data collected from a flux tower on a commercial farm in Aceguá, RS, was used. The Eddy Covariance (EC) method was applied to estimate the Net Ecosystem Exchange (NEE) of CO2. Both grazing regimes exhibited similar seasonal patterns in NEE, with pastures acting as CO2 sinks during the spring and summer months, and as sources during autumn and winter. In terms of annual net exchange, both management systems acted as CO2 sinks. Under rotational management, the total amount of carbon absorbed was -82.4 ± 20.4 g C m-2 yr-1, while under continuous conservative management it was -156.8 ± 17.22 g C g C m-2 yr-1. Therefore, cattle grazing on natural pastures in the Pampa biome can contribute to the mitigation of greenhouse gas emissions.
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