Alterações na paisagem e sequestro de carbono na freguesia de deilão, nordeste de Portugal

Abstract

RESUMO -Estimaram-se estoques de carbono ao nível da paisagem ao longo dos últimos 48 anos na freguesia de Deilão (4.197 ha), Distrito de Bragança, Nordeste de Portugal, com o objectivo de analisar a dinâmica do carbono sequestrado numa paisagem em transformação. Construíram-se cartas de uso do solo com base em coberturas aerofotográficas de 1958, 1968, 1980, 1992 e 2006. A classificação do uso do solo foi baseada no sistema COS2005 (Instituto Geográfico Português), sendo a estrutura da paisagem descrita por métricas da paisagem. A biomassa viva e a folhada, bem como os estoques de carbono foram estimados com base em equações de biomassa e carbono e em dados de inventários. A freguesia de Deilão apresentava sinais de abandono, com redução da área agrícola e aumento da área florestal. O carbono sequestrado aumentou de 20.572 tC em 1958 para 75.449 tC em 2006, alteração essa que corresponde a um incremento de 267% durante o período de tempo considerado. Corresponde também a uma taxa média anual de sequestro de 0,27 tC/ha/ano à escala da paisagem. As alterações recentes da paisagem na freguesia de Deilão são acompanhadas pelo aumento muito significativo do carbono fixado na paisagem.Palavras-chave: Sequestro de carbono; Alteração da paisagem; Abandono da agricultura. 1958, 1968, 1980, 1992 and 2006 LANDSCAPE CHANGES AND CARBON SEQUESTRATION IN THE DEILÃO PARISH, NORTHEASTERN PORTUGAL ABSTRACT -We estimated carbon stocks at the landscape level over the last 48 years in the Deilão Parish (4.197ha), Bragança District, Northeastern Portugal, with the purpose of analyzing carbon sequestration dynamics in this changing landscape. We created land use GIS coverages from aerial photographs from

Analysing carbon sequestration and storage dynamics in a changing mountain landscape in Portugal: insights for management and planning

“…The similarities with this case can be explained by an identical LULC change trend (expansion of forest areas and contraction of agriculture and shrubland areas). Considering just vegetation, however, our results were higher than those estimated by Pinheiro et al (2014) in an area adjacent to our study area based in changes over a period of 48 yrs (0.272 Mg C ha Table 7. Total carbon sequestered (Mg C) and sequestration rate (Mg C ha environmental and geographical context that can influence the carbon SRs in each vegetation cover type.…”

“…Current population is 26,000 mostly in the city of Bragança. Despite depopulation and agricultural abandonment observed over the last decades in rural parishes of the study area Pinheiro et al 2014), the main socio-economical activities in the area are still related to agriculture and forestry even if major sources of income of land owners are in the services sector in the city of Bragança.…”

“…These scenarios aimed to understand how different potential changes in the landscape may impact the future supply and monetary value of the climate regulation ecosystem service. The three scenarios were based on observed and potential trends of LULC changes for the study area described in Azevedo et al (2011) and Pinheiro et al (2014) (Table 2). …”

Farmland abandonment decreases the fire regulation capacity and the fire protection ecosystem service in mountain landscapes

“…Scenarios in the present study aimed to explore how different pathways of landscape evolution may affect FRC and FPES in the future, considering the current trend of the landscape towards abandonment as the baseline. We built the scenarios based on the major transition patterns observed for two parishes within the study area, identified after the analysis of the probability transition matrices (from year 1992 to 2006) available in the studies of Azevedo et al (2011b) and Pinheiro et al (2014).…”

Trade-offs and Synergies Between Provisioning and Regulating Ecosystem Services in a Mountain Area in Portugal Affected by Landscape Change

“…Administratively, the study area encompasses 6 parishes and parts of 13 others ( Figure 1) and includes the city of Braganç a (population 24,000). Parishes have undergone rapid socioeconomic change in the last decades, in particular depopulation and partial agricultural abandonment, which have impacted the landscape (Azevedo et al 2011;Pinheiro et al 2014). The Alto Sabor basin exhibited a relatively high degree of change from 1990 to 2006.…”