Vanesa C. Luis Díaz

Centro de Estudios Ambientales del Mediterráneo | CEAM

Fire and drought are selective driving forces in Mediterranean plants, and thus their ability to resprout or recruit after these disturbances is of paramount importance. The contrast in regeneration niche between resprouters and seeders, and each group's different root characteristics, suggest that they are subjected to different degrees of environ...

Resumen La reforestación es uno de los métodos más ampliamente utilizados para la recuperación de los ecosistemas degradados. En ambientes mediterráneos, las limitaciones impuestas por el clima y, en algunos casos, la severidad de los procesos de degradación hacen que los resultados de las reforestaciones sean pobres. Por otro lado, el seguimiento...

As the main forestry species in the Canary Islands (Spain), Pinus canariensis is frequently used in afforestation programs. Several nursery techniques are commonly employed to modify its morphology and physiology with the aim of improving post-planting survival and growth. In this work, we studied how fertilization and light regime treatments appli...

Differences in morphology, biomass allocations and physiological responses were investigated in seedlings of Mastic tree (Pistacia lentiscus L.) and Cork oak (Quercus suber L.) submitted to contrasting fertilization and light regimes during early growth. These species are two evergreen sclerophyllous Mediterranean species frequently used inMediterr...

We tested the hypothesis that fertilized containerized Pinus canariensis seedlings increases survival when planted in semiarid sites through the improvement of their physiological status during the establishment phase by an increment in root growth. Seedlings were cultured under two different regimes: traditional (in non-fertilized natural soil) an...

Ecological restoration represents an important tool for combating land degradation and increasing ecosystem resistance and resilience to disturbance, thus favoring the recovery of functions and services. Degraded drylands constitute very harsh conditions for the natural regeneration and rangeland restoration of the ecosystems. Scarcity of rainfall...

High O3 levels, driving uptake and challenging defense, prevail on the Canary Islands, being associated with the hot and dry summers of the Mediterranean-type climate. Pinus canariensis is an endemic conifer species that forms forests across these islands. We investigated the effects of ozone on photosynthesis and biochemical parameters of P. canar...

Resumen El estudio de la capacidad de respuesta de las plantas a tratamientos de vivero y la capacidad de modificación de su morfología y fisiología pueden informar sobre de la capacidad de aclimatación de la planta a diferentes condiciones ambientales. Se ha estudiado la plasticidad de variables morfológicas y fisiológicas inducida por la fertiliz...

Frost resistance and ice formation in different developmental states of needles of P. canariensis seedlings were assessed. Regrowth after frost damage was used to determine the overall frost survival capacity. Two distinct freezing exotherms (E1, E2) were registered. E1 was between -1.7 and -2.0°C. Initial frost damage (LT10) was 1.5-2.7°C below E1...

Ozone uptake was studied in a pine forest in Tenerife, Canary Islands, an ecotone with strong seasonal changes in climate. Ambient ozone concentration showed a pronounced seasonal course with high concentrations during the dry and warm period and low concentrations during the wet and cold season. Ozone uptake by contrast showed no clear seasonal tr...

Canopy transpiration (Ec) of a 50-year old Pinus canariensis Chr. Sm. Ex DC. stand in Tenerife, Canary Islands was estimated continuously throughout 1 year from August 2000 to July 2001 by means of xylem sap flow measurements. Although there was pronounced seasonal trend in soil water availability and evaporative demand, Ec did not show any clear s...

In this review we summarize work carried out over the last 10 years on Pinus canariensis, an endemic tree species of the Canary Archipelago, in order to find out: how it is able to adapt to living from near sea level up to about 2.200 m; the response to different environmental conditions; the causes which prevent the natural regeneration in refores...

Diurnal courses of net CO2 assimilation, non-assimilatory processes, electron transport rate, photosystem (PS) II photochemical efficiency, and pigment composition were investigated during summer days for sun exposed needles of Norway spruce trees grown under ambient (AC) and/or elevated (EC; 700 μmol (CO2) mol−1) atmospheric carbon dioxide concent...

La posición estratégica de las Islas Canarias en el Océano Atlántico, cerca de la costa africana e influenciada por muchos factores climáticos, propicia la existencia de una vegetación muy diversa que ha sido estudiada desde distintos puntos de vista. Sin embargo, los estudios que relacionan la fisiología de las plantas con su ambiente han sido esc...

This study tests the influence of different nursery practices, which may affect final plant quality. Different containers, natural and artificial substrates, and concentration of slow-release fertilizers were tested to determine their influence on morphological, physiological and performance attributes of Pinus canariensis, a species of great fores...

Se estudió la influencia de 12 tratamientos de cultivo en vivero (combinando distintos contenedores, sustratos y fertilización) en la calidad de planta de Pinus canariensis y su respuesta en campo. Tras 8 meses de cultivo en vivero se llevó a cabo la plantación de los brinzales en una zona seca de Fasnia (Tenerife) en Febrero del 2002. Las plantas...

Diurnal courses of sap flow density, changes in stem radius, needle level transpiration, and needle water potential were measured in 50-year old Pinus canariensis trees at a forest stand in 1650 m a.s.1. in Tenerife, Canary islands, Spain. A direct comparison of sap flow density estimated at the stem base and canopy transpiration measured at the ne...

RESUMEN Para estudiar las causas que están impidiendo la regeneración natural en los pinares de la isla de Tenerife se establecieron 38 parcelas de investigación con distintos porcentajes de PAR incidente (entre 8 y 48%) en un pinar repoblado al que se habían aplicado previamente distintos aclareos, instalándose una estación meteorológica en una to...

Esta comunicación se engloba dentro de los trabajos realizados en calidad de planta de pino canario en zona seca en la isla de Tenerife. Tras constatar previamente que plantas con mayor calidad morfológica a la salida de vivero (LUIS et al., 2004) mayor altura, diámetro, vigor, etc. tenían mayores tasas de supervivencia y crecimiento en campo (LUIS...