Costa, A. Maia e
Santos, Carmen; Nelson, Charles Dana; Zhebentyayeva, Tetyana; Machado, Helena; Gomes-Laranjo, José; Costa, Rita Lourenço
Rivaes, Rui; Pinheiro, António N.; Egger, Gregory; Ferreira, Teresa
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
Le Page, Y.; Vasconcelos, Maria; Palminha, A.; Melo, I.Q.; Pereira, J.M.C.
Carreira, Bruno M.; Segurado, Pedro; Laurila, Anssi; Rebelo, Rui
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...
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%...
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...
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...
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...
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...
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
Paulo, Joana A.; Tomé, Margarida
Miranda, Isabel; Sousa, Vicelina; Ferreira, Joana; Pereira, Helena
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...
Oliveira, Sofia L.J.; Campagnolo, Manuel L.; Price, Owen F.; Edwards, Andrew C.; Russel-Smith, Jeremy; Pereira, J.M.C.
Ferreira, Liliana; Constantino, Miguel F.; Borges, José G.; Garcia-Gonzalo, Jordi
Fundamental Research - Forest Management