Nitrogen (N) is one of the nutrients most limiting to ecosystem productivity. However, N availability is increasing globally, which may affect ecosystem functions and stability. To understand the role of each ecosystem compartment in the cycling of increased N, we studied the initial response of a nutrient-poor ecosystem, a Mediterranean maquis, to increased N. N availability (dose and forms) was modified by th...
Seasonal variations in leaf nitrogen, phosphorus and potassium concentrations were studied in a mature carob (Ceratonia siliqua L. cv ‘‘Mulata’’) orchard subjected to a 4-year irrigation and fertilization experiment. Three irrigation regimes (0, 50 and 100%), based on the evaporation values obtained from a class A pan, were tested in combination with two nitrogen (N) supply regimes in which 21 kg ha-1 year-1 (l...
Comunicação apresentada no Congreso Forestal Español nos dias 14 e 18 Junho de 1993, em Lourizán. ; Cork-oak cultures were stored in vitro without na intervening subculture, at 5º C in the dark for 5 months without loosing their capacity to regenerate when subcultured under standard conditions. The viability, proliferation rate and elongation of the explants were evaluated during 5 months of storage. Prolifera...
Comunicação apresentada no 2.º Encontro sobre montados de sobro e azinho, realizado 4 e 5 de Junho de 1992 em Évora. ; Neste trabalho apresentam-se os resultados referentes a técnicas de propagação aplicadas ao sobreiro, nomeadamente estacaria e micropropagação. Nas condições ensaiadas a estacaria deu resultados negativos. Aparentemente o enraizamento de estacas só é possível em matéria juvenil, o que inviabil...
S’ han desenvolupat diversos mètodes per a l’ estandarizació de la fase d’ establiment durant la micropropagació de la surera (Quercus suber L.) adulta. Gemes axil.lars i terminals, cultivades, en medi de Gresshof y Doy (1972) (GD), van ser utilizades com a primer explant. L’establiment dels cultius va ser molt dificultós per causa de l’elevat ennegriment dels teixits y/o del medi i per l’elevada contaminació b...
Quercus suber, font primària de la undústria del suro, es posa en producció cada 9-10 anys. L’ objectiu principal d’aquest treball és investigar la influència de la lleva o pela del suro sobre l’ activitat estomàtica i les relations hídriques de la surera. Amb aquest propòsit s’han mesurat els canvis diurns de transpiración, la conductància estomàtica i el potencial hídric, en fase prévia i posterior a la pela,...
Comunicação apresentada no I Congresso Ibérico de Ciências Hortícolas, de 18 a 21 de Junho de 1990 em Lisboa. ; Biomass and nutrient allocation patterns of carob (Ceratonia siliqua L.) leaves, flowers and fruits were studied during three growing seasons in two different orchards: dry and low-irrigated one. The distribution and variation of major elements in mineral soil were also followed during a large perio...
Comunicação apresentada no I Congresso Ibérico de Ciências Hortícolas, 18 a 21 de Junho de 1990 em Lisboa. ; The effect of four irrigation treatments on the vegetative growth and water relations of young carob-trees were studied. The growth parameters and transpiration rates have shown a better water status on the high-watered plants (about 80 liters/tree/month). In spite of the high growth rate presented ther...
Comunicação apresentada no I Congresso Ibérico de Ciências Hortícolas, 18 a 21 de Junho de 1990 em Lisboa. ; Quercus suber is the primary source of industrial cork, and can produce cork every 9-10 years. The main objective of the present work was to investigate the influence of the bark stripping of the cork-oak on the stomacal activity and water relations. For this purpose, diurnal variations on transpiration...
Comunicação apresentada no II Simposium Internacional sobre la Garrofa, nos dias 29 de Setembro a 31 de Outubro de 1987 em Valência. ; This paper sumarizes a work with neutron-gamma radiation on carob seed germination. Morfhological aspects of growth and physiological responses during seedling development have been studied in order to understand the factors influencing plant radiosensitivity. Dormant seeds hav...
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