25 documents found, page 1 of 3
Thermal properties of residual agroforestry biomass of Northern Portugal
Enes, Teresa; Aranha, José; Fonseca, Teresa; Lopes, Domingos; Alves, Ana; Lousada, JoséBiomass from forestry and agricultural sector provides an important contribution to encounter the government’s targets for increasing bioenergy production and utilization. Characterization of agricultural and forest wastes are critical for exploiting and utilizing them for energy purpose. In the present work agricultural and forest wastes and shrubs were sampled in two sites in north Portugal (Ave and Sabor bas...
Red de Paisajes como estrategia de sustentabilidad: estudio de caso de la reser...
Romano, Joaquin; Pérez, Emilio; Lopes, Domingos; Bento, RicardoEl objetivo de sostenibilidad del paisaje rural, ampliamente extendido, plantea enormes diferencias de enfoques, procedimientos y agendas de problemas entre los que proyectan este objetivo en el mercado y los que lo hacen como práctica cultural, social y ecológica. Introducimos en esta comunicación a esta controversia, desde el enfoque integrador de paisaje que ofrece el Convenio Europeo del Paisaje, para anali...
Adult demography, spatial distribution and movements of Phengaris alcon (Lepido...
Gonzalez, Darinka; Oliveira, Irene; Pacheco, Rita; Lopes, Domingos; Arnaldo, Paula SeixasHerein we present the results of the first mark-release-recapture (MRR) study on five populations of Phengaris alcon near Lamas D´Ôlo, a small village located in the Natural Park of Alvão (PNA) in Portugal. For the study of the adult demographic parameters, a MRR study was conducted during the flight period on the five meadow sites, named: Li: Libania; PM: Plana dos Mijaceiros; PR: Ponte Romana; FM: Frente do M...
Quantificação do carbono fixado em povoamentos mistos no norte de Portugal
Nunes, Leónia; Lopes, DomingosEstudos da quantificação da produtividade nos povoamentos mistos em Portugal Continental são importantes face à escassez de informação nesta área, particularmente, no que diz respeito aos povoamentos mistos de Quercus pyrenaica e Pinus pinaster. Esta importância acresce num cenário de alterações climáticas, e também pela necessidade de adaptar medidas de gestão e de quantificar a produção, para monitorizar a ev...
Predição de biomassa arbustiva lenhosa empregando dados de inventário e o índic...
Viana, Helder; Lopes, Domingos; Aranha, JoséCom o intuito de estudar se o Índice de Vegetação de Diferença Normalizada (NDVI), gerado a partir de imagens de satélite de média resolução, pode ser utilizado na quantificação de biomassa vegetal aérea de plantas arbustivas lenhosas, regeneradas após a ocorrência de incêndios florestais, foram instaladas 18 parcelas de amostragem (10m2) em locais ardidos entre os anos de 2000 e 2005 na região de Viseu. A meto...
Growth dynamics and productivity of pure and mixed Castanea Sativa Mill. and Ps...
Nunes, Leónia; Gower, Stith T.; Monteiro, Maria do Loreto; Lopes, Domingos; Rego, FranciscoSince the late 1980's the productivity of monocultures vs. mixed-species forests has been the subject of studies by forest managers and ecologists. Mixed plantations have been established in different proportions to determine if mixtures could provide greater yields and more benefits than monocultures of the component species, as well as to understand if they could be an interesting economic option. An experime...
Estimation of productivity in pine and oak forests in northern Portugal using B...
Nunes, Leónia; Gower, Stith T.; Peckham, Scott D.; Magalhães, Marco; Lopes, Domingos; Rego, Francisco CastroStudies about the productivity of forest ecosystems help to quantify sequestered carbon and provide data that are used in forest management. Forests in northern Portugal are an important economic resource, but their productivity in scenarios of future climate change is not yetwell understood. The objectives of this study were to evaluate and compare simulated net primary production (NPP) andNPPbased onmeasured ...
Growth dynamics and productivity of pure and mixed Castanea sativa Mill. and Ps...
Nunes, Leónia; Gower, Stith T.; Monteiro, Maria L.; Lopes, Domingos; Rego, Francisco CastroSince the late 1980’s the productivity of monocultures vs. mixed-species forests has been the subject of studies by forest managers and ecologists. Mixed plantations have been established in different proportions to determine if mixtures could provide greater yields and more benefits than monocultures of the component species, as well as to understand if they could be an interesting economic option. An experime...
Quantificação da biomassa consumida nos últimos 20 anos de fogos florestais no ...
Aranha, José; Calvão, Ana; Lopes, Domingos; Viana, HelderA análise estatística relativa aos fogos florestais ocorridos, nos últimos 20 anos (1990-2009), em Por-tugal continental, mostra que ocorreram 22380 fogos, que consumiram 2 443 350ha. Analisando ape-nas a região Norte de Portugal (distritos da Guarda, de Viseu, do Porto, do Minho, de Vila Real e de Bragança), verificou-se que a tendência foi a mesma, com 15 339 ocorrências e 1 209 976ha ardidos. Com o objectivo...
A predictive modelling tool for assessing climate, land use and hydrological ch...
Hughes, Samantha Jane; Andrade, Cristina Maria Mendes; Morais, Maria Manuela; Leite, Maria Solange Mendonça; Cortes, Rui Manuel Vitor; Aranha, JoséReservoirs are fundamental for water and energy supply but vulnerable to impacts including climate change. This paper outlines the steps in the development of a model to predict how climate, land use and hydrological change could affect the physiochemical and ecological quality of reservoirs in Portugal’s Douro region. Climatic data will be downscaled for subsequent finer spatial scale models to develop scenari...