Encontrados 42 documentos, a visualizar página 1 de 5
Comparação entre perfis térmicos do solo e do ar num montado de sobro
Andrade, José; Alexandre, Carlos; Nunes, Jorge; Madeira, ManuelOs montados de sobro, pela área que ocupam (cerca de 700000 ha) e por serem fonte de cortiça, de pastagens, de plantas aromáticas e medicinais, de madeira e de habitat para espécies cinegéticas, constituem sistemas agroflorestais de enorme importância nas economias das áreas rurais do sul de Portugal. A sua sustentabilidade a longo prazo está dependente da sua gestão. O pedoclima e as características termodinâ...
Livro Verde dos Montados
Lauw, Alexandra; Gonçalves-Ferreira, Alfredo; Gomes, Alberto; Moreira, Ana Cristina; Fonseca, Ana; Azul, Anabela; Mira, António; Murilhas, AntónioO Livro Verde dos Montados apresenta diversos objectivos que se interligam: Em primeiro lugar, o Livro Verde pretende reunir e sistematizar, de uma forma simples e acessível ao público, o conhecimento produzido em Portugal pelos investigadores e técnicos de várias instituições de investigação ou de gestão que estudam o Montado. Assume-se como uma oportunidade de caracterizar o sistema tendo em conta as suas vár...
A data mining approach to improve multiple regression models of soil nitrate co...
Nunes, Jorge; Madeira, Manuel; Gazarini, Luiz; Neves, José; Vicente, HenriqueThe changes in the soil nitrate concentration were studied during 2 years in a ‘‘montado’’ ecosystem, in the South of Portugal. Total rainfall, air and soil temperature and soil water content under and outside Quercus rotundifolia canopy were also evaluated. A cluster analysis was carried out using climatic and microclimatic parameters in order to maximize the intraclass similarity and minimize the interclass s...
A data mining approach to improve multiple regression models of soil nitrate co...
Nunes, Jorge; Madeira, Manuel; Gazarini, Luiz; Neves, José; Vicente, HenriqueThe changes in the soil nitrate concentration were studied during 2 years in a ‘‘montado’’ ecosystem, in the South of Portugal. Total rainfall,air and soil temperature and soil water content under and outside Quercus rotundifolia canopy were also evaluated. A cluster analysis was carried out using climatic and microclimatic parameters in order to maximize the intraclass similarity and minimize the interclass si...
Simulador para Corte de Peças de Pedra
Filipe Marques; Samuel Silva; Beatriz Sousa Santos; Joaquim Madeira; Manuel Raposo; A indústria de transformação de blocos de pedra em peças decorativas tem evoluído rapidamente, sendo estas realizadas com recurso a máquinas que dispõem de autómatos programáveis, comandos numéricos e aplicações com interfaces de utilizador, que vão desde consolas de operação com...
Decomposition and nutrient release in halophytes of a Mediterranean salt marsh
Simões, Maria Paula; Calado, Maria da Luz; Madeira, Manuel; Gazarini, Luiz CarlosThis study dealt with the decomposition and nutrient release from the halophytes Atriplex portulacoides, Arthrocnemum macrostachyum, Limoniastrum monopetalum, and Spartina densiflora, the dominant species in the Castro Marim salt marsh, Portugal. Environmental effects on decomposition were also assessed. The study was carried out for one year using the in situ litterbag technique. S. densiflora showed a lower d...
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). ...
Organic C distribution and N mineralization in soil of oak woodlands with impro...
Gómez-Rey, Maria Xesús; Garcês, Ana; Madeira, ManuelCork oak woodlands in Portugal are a multipurpose agroforestry system occurring in areas mostly degraded by former cereal crops and overgrazing. The objective of this study was to evaluate the effect of scattered cork oak trees (Quercus suber L.) on soil quality, considering two land use systems: unmanaged pastures and improved pastures. Soil samples were collected in a square grid around scattered cork oak tre...
Extractability of aluminium and forms in solution of soils derived from granite...
Auxtero, Edgardo; Madeira, ManuelExtractable aluminium (Al) was determined in surface and subsurface horizons of eleven pedons derived from granite occurring in Portugal, under a wide range of precipitation. Five successive extractions with 1 M KCl, 0.5 M CuCl2 and 0.33 M LaCl3 were used. Monomeric (Alm) and organic (Alorg) forms of Al in the soil solution, extracted at field capacity, were also determined. Amounts of extracted Al were greates...
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