Navegando por Assunto "Global warming"

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Acesso aberto (Open Access)
Potencial do sequestro de carbono em plantios de dendezeiros para compensar as emissões de gases de efeito estufa no processo produtivo de óleo de palma
(Universidade Federal do Pará, 2017-03-24) LABAN, Duber Orlando Chinguel; VASCONCELOS, Steel Silva; ARAÚJO, Alessandro Carioca de
Currently, the oil palm plantations are expanding in the Brazilian Amazon, where there are the optimal conditions for their development. The limitation of culture is an important factor for the maintenance of primary areas in the Amazon. Therefore, to know the characteristics of the culture within a productive context it is necessary to apply methodologies that help the executors of the companies to take into account the carbon emissions of the product. Some studies have been adopting methodologies to determine the greenhouse gas emissions emitted in the palm oil production process, through life cycle assessment applications. In this scenario, this work estimated the carbon stocks in the hybrid palm Interspecific (HIE) (Elaeis oleifera cortés x Elaeis guineensis jacq) over 25 years (productive time of the palm) and later to inventory greenhouse gas emissions from the palm oil production process at Marborges SA. The values show to hybrid palm oil, a carbon sequestration of 0.49 Mt CO2 in 25 years and emissions from the productive process are recorded at 0.39 Mt CO2eq. In addition, it was estimated that in the native vegetation areas of the company, the sequestration registered 4.5 Mt CO2, more than the palm plantations. Finally, it can be concluded that within the environmental context the compensation of the gases emitted in the production process of palm oil should happen in pasture areas only or areas without vegetation allied to the maintenance of the native vegetation.
Acesso aberto (Open Access)
Variação temporal do efluxo de CO2do solo em sistemas agroflorestais com palma de óleo na Amazônia Oriental
(Instituto Nacional de Pesquisas da Amazônia, 2016-03) SILVA, Carolina Melo da; VASCONCELOS, Steel Silva; OLIVEIRA JUNIOR, Moisés Cordeiro Mourão de; KATO, Osvaldo Ryohei; SILVA JUNIOR, Alberto Cruz da; CASTELLANI, Débora Cristina
The soil carbon dioxide (CO2) efflux dynamics and its controlling factors of Amazonian agroforestry systems are poorly understood. The objective of this study was to evaluate the temporal variation of soil CO2 efflux in oil palm-based agroforestry systems and the relation between efflux and biotic (microbial and total soil carbon, microbial respiration, fine roots, individual components of agroforestry systems (AFS)) and abiotic factors (soil moisture and temperature). The measurements were taken during the less rainy (December 2010) and rainy (May 2011) periods. The soil CO2 efflux was highest during the rainy season, probably due to increased microbial activity influenced by climatic factors coupled with biotic factors. The soil CO2 efflux correlated positively with soil moisture and microbial biomass carbon and negatively with soil temperature and metabolic quotient, but these correlations were weak. The soil CO2 efflux was sensitive to the type of agroforestry system and to rainfall seasonality.