Conclusions

The research literature emphasizes that conversion of forest to pasture is an important source of greenhouse gas emissions, notably CO2, to the atmosphere. Globally, land use changes are responsible for about 14% of total emissions. Research on

SOM dynamics under well-managed pastures has shown that soil organic carbon stocks progressively increase with time after pasture cultivation. This means that if considered in isolation, soils under well-managed pastures can be considered as a CO2 sink. However, when the whole system is evaluated, including the slash-and-burn process, it acts as a source of CO2 to the atmosphere. The disequilibria between inputs and outputs of carbon can be aggravated if we consider the simulations performed in the present study. The scenarios used here indicated that there is a negative feedback in the soil carbon stocks due to increased temperatures caused by climate change. Under this new climatic condition, the soil carbon accumulation rate under Amazonian pastures tends to decrease, which reduces its atmospheric CO2 mitigation effect.

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