Encontrados 136 documentos, a visualizar página 1 de 14
Spatial distribution of Madeira Island Laurisilva endemic spiders (Arachnida: A...
Crespo, Luís C.; Boieiro, Mário; Cardoso, Pedro; Aguiar, Carlos A. S.; Amorim, Isabel R.; Barrinha, Carla; Borges, Paulo A. V.; Menezes, DiliaCopyright © Crespo L et al.. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. ; Madeira island presents a unique spider diversity with a high number of endemic species, many of which are still poorly known. A recen...
Manual de formação para criadores de gado e para-veterinários
Quintas, Hélder; Silva, Nicolau; Aguiar, CarlosParte das orientações, nomeadamente no respeitante aos para-veterinários foi organizada de acordo com “A manual for the primary animal health care worker” da organização para a Agricultura e Alimentação das Nações Unidas (FAo), publicado pela primeira vez em 1994. todavia, não se trata de uma tradução para a língua portuguesa, nem se pretende substituir o referido manual. ; O presente manual foi elaborado no â...
Fertilização de lameiros naturais: produtividade e composição química da vegetação
Rodrigues, M.A.; Dias, D.; Pires, Jaime; Ferreira, I.Q.; Freitas, Sara; Aguiar, Carlos; Arrobas, MargaridaOs lameiros são pastagens seminaturais de montanha com elevada predominância no centro e Norte de Portugal, de elevado valor ecológico e a base de suporte da atividade pecuária local. A produtividade e a composição florística dos lameiros têm sido estudados em função de gradientes ecológicos diversos, mas poucos estudo têm incluído diferentes estratégias de fertilização com incorporação de micronutrientes. Nest...
The effect of different winter cover crops on sorghum nutritional status and dr...
Ferreira, I.Q.; Aguiar, Carlos; Arrobas, Margarida; Dias, D.; Freitas, Sara; Rodrigues, M.A.Growing winter cover crops has a great agroecological meaning, since it allow maintaining the residual inorganic N in the soil/plant system, thus avoiding leaching of N (Rodrigues et al., 2002). As winter cover crops, it can be grown diverse species (Jensen, 1992). If legume species were used, they can access atmospheric N through the establishment of a symbiotic relationship with N-fixing bacteria (Russelle, 2...
Nitrogen mineralized during sorghum growth after soil incorporation of differen...
Dias, D.; Aguiar, Carlos; Arrobas, Margarida; Rodrigues, M.A.Growing catch crops during the autumn/winter period is a strategy of high ecological significance since it allows reducing the residual inorganic-N present in the soil after the summer season (Rodrigues et al., 2002). Thus, winter catch crops reduce the risk of denitrification and nitrate leaching associated to the excess of rain of the autumn/winter months. Incidentally, the evergreen systems confer several ot...
Spatial Factors Play a Major Role as Determinants of Endemic Ground Beetle Beta...
Boieiro, Mário; Carvalho, José C.; Cardoso, Pedro; Aguiar, Carlos A. S.; Rego, Carla; de Faria e Silva, Israel; Amorim, Isabel R.Copyright: © 2013 Boieiro et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. ; The development in recent years of new beta diversity analytical approaches highlighted valuable information on the different processes struct...
The role of holm oak edges in the control of disturbance and conservation of pl...
Azevedo, João; Possacos, Anabela; Aguiar, Carlos; Amado, Anabela; Miguel, Luis; Dias, Rui; Loureiro, Carlos; Fernandes, Paulo M.Holm oak (Quercus rotundifolia) woodlands have been able to persist in fire-prone landscapes in northern Portugal where they seem to play a relevant role in community and landscape level patterns and processes, namely in the control of disturbance events and in the maintenance of biodiversity. In this research we tested the following hypotheses: (i) holm oak woodlands affect fire behavior, mainly by disrupting ...
Farming systems in mountain regions of NE Portugal: conversion from conventiona...
Fernández-Núñez, E.; Moreira, Nuno; Cabanas, J.E.; Pires, João; Aguiar, Carlos; Bernardo, Adelino; Rodrigues, M.A.; Pires, JaimeThe energy efficiency of a mountain mixed-farming system in NE Portugal was analysed for the period 2002-2003. The energy calculation included the energy of all inputs (fertilizers, fuels, concentrates for cattle) on farm production and the energy of outputs (bovine meat). The energy values were calculated by multiplying the quantities of inputs, indoor system production and outputs by their energy content. The...
Agronomia e ecologia dos lameiros
Pires, Jaime; Fernández-Núñez, E.; Fernandes, Adelaide; Pires, João; Bernardo, Adelino; Galvão, Lurdes; Aguiar, Carlos; Moreira, NunoOs lameiros são tradicionalmente as pastagens de montanha em Portugal com maior importância para a produção animal, principalmente de bovinos. Estes agroecossistemas, apesar de serem uma componente fulcral para o funcionamento dos sistemas agro-pecuários de montanha, não têm sido objeto de estudo de forma continuada e sistemática.
Micronutrient levels in pastures established in the north-east of Portugal
Fernández-Núñez, E.; Cuiña-Cotarelo, R.; Mosquera-Losada, M.R.; Rigueiro-Rodríguez, A.; Rodrigues, M.A.; Arrobas, Margarida; Aguiar, CarlosIn this study we evaluate the effects of six types of fertilization: no fertilizer, lime, manure, lime + phosphorus, lime + phosphorus + boron and manure + inorganic fertilizer; and two types of pasture: spontaneous vegetation and sown pasture, on soil pH and micronutrient concentrations in herbage of pastures established in the NE of Portugal. The results showed that there were higher levels of Cu in the ferti...
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