Encontrados 32 documentos, a visualizar página 1 de 4
Government bond yield spreads in EMU countries: The story of an ephemeral conve...
Abreu, Francisco Trigueiros Sampaio Farto eA Work Project, presented as part of the requirements for the Award of a Masters Degree in Economics from the NOVA – School of Business and Economics ; The inception of the European Monetary Union appeared to have accomplished the yields’ convergence goal of Maastricht. Suddenly however, spreads against Germany started escalating towards the values of the early nineties. Through the usage of a fixed-effects Ar...
Microclimatic specificity of a Mediterranean oak woodland (montado) in context ...
Nunes, Jorge; Andrade, José; Abreu, Francisco; Gazarini, Luiz; Madeira, ManuelThe effects of oak trees on microclimatic parameters in Quercus rotundifolia Lam. woodland in Alentejo, Southern Portugal, are reported. The results show that oak trees create a marked differentiation in the grass matrix between open and tree-canopied habitats. Compared to open areas, oak canopy cover is associated with lower soil moisture content, lower soil temperature and lower photosynthetically active radi...
Microclimatic specificity of a Mediterranean oak woodland (montado) in the cont...
Nunes, Jorge; Andrade, José; Abreu, Francisco; Gazarini, Luís; Madeira, manuelThe effects of oak trees on microclimatic parameters in Quercus rotundifolia Lam. woodland in the Alentejo, Southern Portugal, are reported. Results show that oak tree create a marked differentiation in the grass matrix, between open and undercanopy areas. Compared to open areas, it presents lower soil moisture beneath the oak canopy, lower soil temperatures and lower photosynthetically active radiation (PAR). ...
Influence of litter layer removal on the soil thermal regime of a pine forest i...
Andrade,José Alexandre Varanda; Abreu,Francisco Manuel Gonçalves de; Madeira,Manuel Armando ValerianoThe removal of the litter layer in Portuguese pine forests would reduce fire hazard, but on the other hand this practice would influence the thermal regime of the soil, hence affecting soil biological activity, litter decomposition and nutrient dynamics. Temperature profiles of a sandy soil (Haplic Podzol) under a pine forest were measured with thermocouples at depths to 16 cm, with and without litter layer. Th...
Influence of litter layer removal on the soil thermal regime of a pine forest i...
Andrade, José; Abreu, Francisco; Madeira, ManuelA remoção da manta morta nos pinhais portugueses pode reduzir o risco de incêndio florestal, mas tal prática pode influenciar o regime térmico do solo, afectando desta forma a actividade biológica do solo, a decomposição da manta morta e a dinâmica de nutrientes. Num solo arenoso (Haplic Podzol) sob um pinhal foram medidos perfis térmicos com termopares a várias profundidades até 16 cm, com ou sem manta morta. ...
The Montado agroforestry system microclimatic specificity in the context of glo...
Nunes, Jorge; Andrade, José; Abreu, Francisco; Gazarini, Luís; Madeira, ManuelThe effects of oak trees on microclimatic parameters in Quercus rotundifolia Lam. woodland in the Alentejo, Southern Portugal, are reported. Results show that oak tree create a marked differentiation in the grass matrix, between open and undercanopy areas. Compared to open areas, it presents lower soil moisture beneath the oak canopy, lower soil temperatures and lower photosynthetically active radiation (PAR). ...
Efeitos do clima, da poluição atmosférica e do estado sanitário das árvores na ...
Fabião, António; Ramos, Ana Paula; Caetano, Maria Filomena; Ferreira, Margarida; Alves, Ana; Rodrigues, José Carlos; Abreu, FranciscoOs pólens das árvores urbanas podem participar decisivamente na manifestação de doenças respiratórias alérgicas. Por outro lado, o estado sanitário das árvores e a poluição do ar podem influenciar a quantidade, características e época de produção de pólen. Neste contexto, iniciou-se um projecto de investigação visando: (a) desenvolver o conhecimento das relações entre produção de pólen e elementos do clima, pol...
Concentrações e fluxos de nutrientes no gotejo e escorrimento do tronco de Frax...
Pereira, Ermelinda; Madeira, Manuel; Abreu, Francisco Gonçalves deAvaliou-se a concentração e os fluxos de nutrientes no gotejo e no escorrimento do tronco de freixo (Fraxinus angustifolia Vahl), num lameiro do Nordeste de Portugal. A precipitação bruta, a precipitação sob coberto (throughfall) e o escorrimento do tronco (stemflow) foram objecto de monitorização e amostras foram colhidas periodicamente para determinação do pH, dos teores de carbono (COD) e azoto (NOD) orgânic...
Eventuais efeitos de alterações climáticas no estabelecimento de culturas medit...
Andrade, José; Abreu, FranciscoTemperature, water and light affect directly crop growth and development. Extremes variations of soil temperature near the surface of bare soils and quick changes of soil water content due to irregular rainfall and high evaporative demand affect markedly crop productivity in Mediterranean areas. At these conditions, crop productivity depends strongly on its early development. Changes on net radiation at soil-at...
Possible effects of climate change on the early development of pea, broad bean,...
Andrade, José; Abreu, FranciscoTemperature, water and light affect directly crop growth and development. Extremes variations of temperature near the surface of bare soils and quick changes of soil water content due to irregular rainfall and high evaporative demand affect markedly crop productivity in Mediterranean areas. At these conditions, crop productivity depends strongly on its early development. Both changes on net radiation at soil-at...
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