Recursos de colección

UTL Repository Universidade Técnica de Lisboa (32.727 recursos)

O Repositório Institucional da Universidade Técnica de Lisboa desenvolvido no âmbito do projecto RCAAP. Este repositório destina-se a recolher, preservar e disponibilizar o acesso às publicações científicas e didácticas de seis: Escolas da UTL: Faculdade de Medicina Veterinária, Instituto Superior de Agronomia, Instituto Superior de Economia e Gestão, Instituto Superior de Ciências Sociais e Políticas , Faculdade de Motricidade Humana, Faculdade de Arquitectura. O Instituto Superior Técnico, igualmente Escola Da UTL, tem repositório independente.

DEF - Departamento de Engenharia Florestal

Mostrando recursos 1 - 20 de 55

  1. Os fogos florestais e a engenharia militar

    Costa, A. Maia e

  2. First interspecific genetic linkage map for Castanea sativa x Castanea crenata revealed QTLs for resistance to Phytophthora cinnamomi

    Santos, Carmen; Nelson, Charles Dana; Zhebentyayeva, Tetyana; Machado, Helena; Gomes-Laranjo, José; Costa, Rita Lourenço
    Research Article

  3. The role of morphodynamic disturbance and groundwater hydrology as driving factors of riparian landscape patterns in mediterranean rivers

    Rivaes, Rui; Pinheiro, António N.; Egger, Gregory; Ferreira, Teresa
    Original Research

  4. Forage-SAFE: a tool to assess the management and economics of wood pasture systems

    García de Jalón, S.P.J.; Graves, A.; Moreno, G.; Palma, J.H.N.; Crous-Duran, J.; Oliveira, T.; Burgess, P.J.
    The Forage-SAFE model has been developed to better understand the impact of trees on the profitability of wood pastures. It assesses the daily balance between the demand for and production of forage to estimate an annual farm net margin. The model allows the modification of selected biophysical and financial parameters related to the tree, pasture and livestock components (such as tree cover density, carrying capacity and livestock species) which can be optimised to maximise net farm income. A case study in a dehesa wood pasture in South-western Spain was used to show the applicability of the model. The case study results showed that net margin was maximised at around 27% tree cover...

  5. An operational approach to high resolution agro-ecological zoning in West-Africa

    Le Page, Y.; Vasconcelos, Maria; Palminha, A.; Melo, I.Q.; Pereira, J.M.C.
    Research Article

  6. Can heat waves change the trophic role of the world's most invasive crayfish ? Diet shifts in Procambarus clarkii

    Carreira, Bruno M.; Segurado, Pedro; Laurila, Anssi; Rebelo, Rui
    Research Article

  7. Avaliação da eficiência das passagens para peixes através de detectores de infravermelhos. Riverwatcher: um caso de estudo

    Pinheiro, Paulo J.; Santos, José M.; Ferreira, M.T.; Bochechas, Jorge
    A eficiência de uma passagem para peixes de bacias sucessivas instalada na mini-hídrica de Janeiro de Cima, no rio Zêzere, foi avaliada utilizando um dispositivo de leitura de infravermelhos, o Riverwatcher. Este aparelho funciona como um “bio-scanner ”, cuja função é a contagem do número de peixes que transpõem os leitores de infravermelhos do dispositivo, registando além de dados ambientais como a temperatura da água, variáveis como o comprimento e silhueta dos peixes. Foram efectuados três ensaios com a intenção de aferir este dispositivo de monitorização, relativamente à contagem e à forma das silhuetas. Constatou-se que o Riverwatcher foi pouco eficaz na monitorização do uso da passagem...

  8. Storage stability of Jatropha curcas L. oil naturally rich in gamma-tocopherol

    Rodrigues, Joana; Miranda, Isabel; Furquim, Leonnardo; Gominho, Jorge; Vasconcelos, Manuel; Barradas, Gonçalo; Pereira, Helena; Bianchi-de-Aguiar, Fernando; Ferreira-Dias, Suzana
    tJatropha curcas L. is an interesting tropical oil crop for biodiesel production. However, seed conservationuntil oil extraction may be a problem under high temperature and humidity. In this study, Jatropha curcasL. seeds grown in Mozambique and presenting 160 mg/kg of gamma-tocopherol in their oil were storedfor 42 days, in dark, at 35◦C and 75% or 92% relative humidity (RH). Along storage, the oil was extractedand analysed in terms of fatty acid composition, tocopherol content, acidity, initial and final oxidationproducts (monitored by K232 and K270 values, respectively).Jatropha seeds presented an initial water content of 8.4% and an oil content of 45.7%...

  9. Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland

    Costa-e-Silva, Filipe; Correia, Alexandra C.; Piayda, Arndt; Dubbert, Maren; Rebmann, Corinna; Cuntz, Matthias; Werner, Christiane; David, Jorge Soares; Pereira, João Santos
    In seasonally dry climates, such as the Mediterranean, lack of rainfall in the usually wet winter may originate severe droughts which are a main cause of inter-annual variation in carbon sequestration. Leaf phenology variability may alter the seasonal pattern of photosynthetic uptake, which in turn is determined by leaf gas exchange limitations. The current study is based on the monitoring of an extremely dry winter in an evergreen cork oak woodland under the Mediterranean climate of central Portugal. Results are focused on net ecosystem CO2 exchange (NEE), phenology and tree growth measurements during two contrasting years: 2011, a wet year with a typical summer drought pattern...

  10. Classification modeling based on surface porosity for the grading of natural cork stoppers for quality wines

    Oliveira, Vanda; Knapic, Sofia; Pereira, Helena
    tThe natural cork stoppers are commercially graded into quality classes according with the homogeneity of theexternal surface. The underlying criteria for this classification are subjective without quantified criteria and standardsdefined by cork industry or consumers. Image analysis was applied to premium, good and standard quality classes tocharacterize the surface of the cork stoppers and stepwise discriminant analysis (SDA) was used to build predictiveclassification models. The final goal is to analyze the contribution of each porosity feature and propose an algorithmfor cork stoppers quality class classification. This study provides the knowledge based on a large sampling to anaccurate grading of natural...

  11. Chemical composition and kraft pulping potential of 12 eucalypt species

    Neiva, Duarte; Fernandes, Luís; Araújo, Solange; Lourenço, Ana; Gominho, Jorge; Simões, Rogério; Pereira, Helena
    Eucalypts are among the most important short-rotation hardwoods, planted worldwide for the pulp and paper industry. Even though the genus comprises over 700 species, only about a dozen species are used for pulping purposes, therefore, showing the potential for diversification. Six-year-old eucalypt trees from 12 species (Eucalyptus botryoides, Eucalyptus camaldulensis, Eucalyptus globulus, Eucalyptus grandis, Corymbia maculata, Eucalyptus ovata, Eucalyptus propinqua, Eucalyptus resinifera, Eucalyptus rudis, Eucalyptus saligna, Eucalyptus sideroxylon, and Eucalyptus viminalis) were analyzed for chemical composition, fiber morphological, pulping and handsheet paper properties to determine their kraft pulping suitability. The 12 species showed substantial differences regarding extractives (6.1–18.9%), lignin (21.6–30.8%) and holocellulose content (55.4–70.1%). The high inter-species variation...

  12. Sensory impact of alternative ageing technology for the production of wine brandies

    Caldeira, Ilda; Anjos, Ofélia; Belchior, A. Pedro; Canas, Sara
    The production of wine brandies requires their stage in wooden barrels, for a minimum period of time, a process called ageing or maturation. Due to the high cost of this process, alternative technologies are being studied in order to accelerate the ageing process, such as the use of wood fragments inside of stainless steel tanks. The present work evaluates the influence of different ageing technologies on the sensory profile of the brandy. A brandy was aged, during two years, in 650 L wooden barrels and in 3000 L stainless steel tanks. Both had Limousin oak (Quercus robur) and Portuguese chestnut staves (Castanea sativa). The...

  13. Physical, chemical and mechanical properties of Pinus sylvestris wood at five sites in Portugal

    Fernandes, Cláudia; Gaspar, Maria João; Pires, Jani; Alves, Ana; Simões, Rita; Rodrigues, José Carlos; Silva, Maria Emília; Carvalho, Ana; Brito, José Eduardo; Lousada, José Luís
    Research Article

  14. Tabela de produção geral para o pinheiro bravo em Portugal

    Tomé, Margarida

  15. CliPick - Climate change web picker. A tool bridging daily climate needs in process based modelling in forestry and agriculture

    Palma, J.H.N.
    Resource Communication

  16. Using the SUBER model for assessing the impact of cork debarking rotation on equivalent annual annuity in Portuguese stands

    Paulo, Joana A.; Tomé, Margarida
    Research Article

  17. Chemical characterization and extractives composition of heartwood and sapwood from Quercus faginea

    Miranda, Isabel; Sousa, Vicelina; Ferreira, Joana; Pereira, Helena
    Research Article

  18. Species-specific adaptations explain resilience of herbaceous understorey to increased precipitation variability in a Mediterranean oak woodland

    Jongen, Marjan; Hellmann, Christine; Unger, Stephan
    To date, the implications of the predicted greater intra-annual variability and extremes in precipitation on ecosystem functioning have received little attention. This study presents results on leaf-level physiological responses of five species covering the functional groups grasses, forbs, and legumes in the understorey of a Mediterranean oak woodland, with increasing precipitation variability, without altering total annual precipitation inputs. Although extending the dry period between precipitation events from 3 to 6 weeks led to increased soil moisture deficit, overall treatment effects on photosynthetic performance were not observed in the studied species. This resilience to prolonged water stress was explained by different physiological and morphological strategies to withstand periods below the wilting...

  19. Ecological implications of fine-scale fire patchiness and severity in tropical savannas of northern Australia

    Oliveira, Sofia L.J.; Campagnolo, Manuel L.; Price, Owen F.; Edwards, Andrew C.; Russel-Smith, Jeremy; Pereira, J.M.C.
    Research Article

  20. Addressing wildfire risk in a landscape-level scheduling model: an application in Portugal

    Ferreira, Liliana; Constantino, Miguel F.; Borges, José G.; Garcia-Gonzalo, Jordi
    Fundamental Research - Forest Management

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