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Abstract(s)
No sentido de determinar a evolução dos stocks de carbono numa área do
nordeste de Portugal, concelho de Bragança, freguesia de Deilão, foi estudada a
evolução do uso do solo num intervalo de 48 anos. Utilizaram-se coberturas de
fotografia aérea do território estudado relativas aos anos de 1958, 1968, 1980, 1992 e
2006, para construir cartas de uso/ocupação. A partir dessa cartografia e de vários
estudos da biomassa/carbono da vegetação, estimaram-se os valores da biomassa
(aérea e radicular) e dos stocks de carbono presentes na paisagem.
Os resultados sugerem que os stocks de carbono aumentaram 360% ao longo
do período em análise. No ano de 1958 a paisagem de Deilão fixava um total de
20.572 t de C e no ano de 2006 esse valor era de 75.449 t.
As alterações estruturais e de funcionamento da paisagem, nomeadamente as
relacionadas com o abandono da agricultura e a ocorrência de incêndios, modificam
significativamente os valores de carbono sequestrado à escala da paisagem.
In order to determine the evolution of carbon stocks in an area of northeastern Portugal, district of Bragança, Parish of Deilão, we studied the evolution of land uses over a period of 48 years. We used aerial photography coverages of the study area for the years 1958, 1968, 1980, 1992 and 2006 to build land use / land cover maps. From this mapping and several studies of biomass to carbon and vegetation, we estimated the values of biomass (above- and below- ground) and the carbon stocks present in this landscape. The results suggest that carbon stocks increased 360% over the period under study. By 1958, the landscape of Deilão fixed a total of 20,572 tons of C and in 2006 it amounted to 75,449 tons. Structural and functional changes in the landscape, particularly those related to the abandonment of agriculture and wildfires, significantly alter the values of carbon sequestered at the landscape level.
In order to determine the evolution of carbon stocks in an area of northeastern Portugal, district of Bragança, Parish of Deilão, we studied the evolution of land uses over a period of 48 years. We used aerial photography coverages of the study area for the years 1958, 1968, 1980, 1992 and 2006 to build land use / land cover maps. From this mapping and several studies of biomass to carbon and vegetation, we estimated the values of biomass (above- and below- ground) and the carbon stocks present in this landscape. The results suggest that carbon stocks increased 360% over the period under study. By 1958, the landscape of Deilão fixed a total of 20,572 tons of C and in 2006 it amounted to 75,449 tons. Structural and functional changes in the landscape, particularly those related to the abandonment of agriculture and wildfires, significantly alter the values of carbon sequestered at the landscape level.
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Keywords
Carbono Biomassa Alteração da paisagem Abandono da agricultura