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CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)
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Papers by J. Olivar
IAWA Journal, 2015
During the second half of the 20th century, the Mediterranean area has experienced an increase in... more During the second half of the 20th century, the Mediterranean area has experienced an increase in temperature, and a decrease in precipitation leading to a higher frequency of severe droughts. Consequently, widespread Mediterranean pine species suffered a shift in their climate-growth relationships that might lead to detrimental consequences. Wood features such as wood density are also affected by recent climatic changes producing an effect on wood structure and quality. Tree-ring anatomy was analyzed in three species (Pinus halepensis, P. pinaster and P. sylvestris), the three main pine species in Spain, in order to understand the relationships between tree-ring width and wood density as well as the influence of the climatic variations on these variables. Precipitation influenced tree radial growth and wood density for the three species, but at different times of the growth period. Mean and maximum density followed different patterns for the three species, decreasing with time in P...
Dendrochronologia, 2012
... Jorge Olivar a , b , Corresponding Author Contact Information , E-mail The Corresponding Auth... more ... Jorge Olivar a , b , Corresponding Author Contact Information , E-mail The Corresponding Author , Stella Bogino c , Heinrich Spiecker b , Felipe ... positively with the winter and spring precipitations and negatively with the temperatures of the spring months ( [Papadopoulos et al ...
Las parcelas de muestreo fueron seleccionados dentro del área de distribución natural de P.halepe... more Las parcelas de muestreo fueron seleccionados dentro del área de distribución natural de P.halepensis y P.pinaster en la península ibérica (Figura 1).
Annals of Forest Science, 2013
& Context Modification of stand density by thinning may buffer the response of tree growth and vi... more & Context Modification of stand density by thinning may buffer the response of tree growth and vigor to changes in climate by enhancing soil water availability. & Aims We tested the impact of thinning intensity on cambial growth of Aleppo pine (Pinus halepensis L.) under semi-arid, Mediterranean conditions. & Methods A multiple thinning experiment was established on an Aleppo pine plantation in Spain. We analysed the stem growth dynamics of two different crown classes under four different thinning intensities (15 %, 30 %, and 45 % removal of the basal area) for 2 years, based on biweekly band dendrometer recordings. Local relative extractable soil water was derived from the use of a water balance model Biljou© (available at https://appgeodb.nancy.inra.fr/biljou/) and used as an explanatory variable. & Results Radial growth was mainly controlled by soil water availability during the growing season, and differed by crown class. The growth rates of dominant trees were significantly higher than the growth rates of suppressed trees. Removal of 30 % and 45 % of the initial basal area produced a growth release in both dominant and suppressed trees that did not occur under less intense thinning treatments. & Conclusions Soil water availability was the main driver of radial growth during the growing season. Forest management confirmed its value for ameliorating the effects of water limitations on individual tree growth. These results may help managers understand how altering stand density will differentially affect diameter growth responses of Aleppo pine to short-term climatic fluctuations, promoting forests that are resilient to future climatic conditions.
... Page 126. 124 Jorge Olivar, Heinrich Spiecker, Felipe Bravo wider tree rings in P. halepensis... more ... Page 126. 124 Jorge Olivar, Heinrich Spiecker, Felipe Bravo wider tree rings in P. halepensis (Papadopoulos et al. 2008). Therefore we can agree with previous studies that have shown that IADFs are more frequent in wider tree rings (Vieira et al. 2009, Rigling et al. ...
Estudios sobre la evolución del clima predicen que los árboles en Europa experimentarán un aument... more Estudios sobre la evolución del clima predicen que los árboles en Europa experimentarán un aumento de las temperaturas y de las sequías estivales en el futuro. Estos cambios no sólo afectarán al crecimiento radial sino también a la densidad de la madera, que ha demostrado ser muy sensible a variaciones en el clima a escala inter-anual. El objetivo de este estudio es analizar la influencia del clima en la densidad de la madera del pino carrasco (Pinus halepensis Mill.) y el pino negral (Pinus pinaster Ait.) identificando las variables climáticas más influyentes. Se seleccionaron 15 árboles dominantes por parcela de los cuales se extrajeron dos muestras radiales para ser analizadas con rayos x para conocer su densidad. Los resultados obtenidos (densidad media anual, máxima densidad de la madera tardía, etc.) servirán como un paso importante a la hora de interpretar y evaluar el comportamiento de los bosques mediterráneos frente a futuros cambios en el clima. La inclusión de la densida...
IAWA Journal, 2015
During the second half of the 20th century, the Mediterranean area has experienced an increase in... more During the second half of the 20th century, the Mediterranean area has experienced an increase in temperature, and a decrease in precipitation leading to a higher frequency of severe droughts. Consequently, widespread Mediterranean pine species suffered a shift in their climate-growth relationships that might lead to detrimental consequences. Wood features such as wood density are also affected by recent climatic changes producing an effect on wood structure and quality. Tree-ring anatomy was analyzed in three species (Pinus halepensis, P. pinaster and P. sylvestris), the three main pine species in Spain, in order to understand the relationships between tree-ring width and wood density as well as the influence of the climatic variations on these variables. Precipitation influenced tree radial growth and wood density for the three species, but at different times of the growth period. Mean and maximum density followed different patterns for the three species, decreasing with time in P...
Dendrochronologia, 2012
... Jorge Olivar a , b , Corresponding Author Contact Information , E-mail The Corresponding Auth... more ... Jorge Olivar a , b , Corresponding Author Contact Information , E-mail The Corresponding Author , Stella Bogino c , Heinrich Spiecker b , Felipe ... positively with the winter and spring precipitations and negatively with the temperatures of the spring months ( [Papadopoulos et al ...
Las parcelas de muestreo fueron seleccionados dentro del área de distribución natural de P.halepe... more Las parcelas de muestreo fueron seleccionados dentro del área de distribución natural de P.halepensis y P.pinaster en la península ibérica (Figura 1).
Annals of Forest Science, 2013
& Context Modification of stand density by thinning may buffer the response of tree growth and vi... more & Context Modification of stand density by thinning may buffer the response of tree growth and vigor to changes in climate by enhancing soil water availability. & Aims We tested the impact of thinning intensity on cambial growth of Aleppo pine (Pinus halepensis L.) under semi-arid, Mediterranean conditions. & Methods A multiple thinning experiment was established on an Aleppo pine plantation in Spain. We analysed the stem growth dynamics of two different crown classes under four different thinning intensities (15 %, 30 %, and 45 % removal of the basal area) for 2 years, based on biweekly band dendrometer recordings. Local relative extractable soil water was derived from the use of a water balance model Biljou© (available at https://appgeodb.nancy.inra.fr/biljou/) and used as an explanatory variable. & Results Radial growth was mainly controlled by soil water availability during the growing season, and differed by crown class. The growth rates of dominant trees were significantly higher than the growth rates of suppressed trees. Removal of 30 % and 45 % of the initial basal area produced a growth release in both dominant and suppressed trees that did not occur under less intense thinning treatments. & Conclusions Soil water availability was the main driver of radial growth during the growing season. Forest management confirmed its value for ameliorating the effects of water limitations on individual tree growth. These results may help managers understand how altering stand density will differentially affect diameter growth responses of Aleppo pine to short-term climatic fluctuations, promoting forests that are resilient to future climatic conditions.
... Page 126. 124 Jorge Olivar, Heinrich Spiecker, Felipe Bravo wider tree rings in P. halepensis... more ... Page 126. 124 Jorge Olivar, Heinrich Spiecker, Felipe Bravo wider tree rings in P. halepensis (Papadopoulos et al. 2008). Therefore we can agree with previous studies that have shown that IADFs are more frequent in wider tree rings (Vieira et al. 2009, Rigling et al. ...
Estudios sobre la evolución del clima predicen que los árboles en Europa experimentarán un aument... more Estudios sobre la evolución del clima predicen que los árboles en Europa experimentarán un aumento de las temperaturas y de las sequías estivales en el futuro. Estos cambios no sólo afectarán al crecimiento radial sino también a la densidad de la madera, que ha demostrado ser muy sensible a variaciones en el clima a escala inter-anual. El objetivo de este estudio es analizar la influencia del clima en la densidad de la madera del pino carrasco (Pinus halepensis Mill.) y el pino negral (Pinus pinaster Ait.) identificando las variables climáticas más influyentes. Se seleccionaron 15 árboles dominantes por parcela de los cuales se extrajeron dos muestras radiales para ser analizadas con rayos x para conocer su densidad. Los resultados obtenidos (densidad media anual, máxima densidad de la madera tardía, etc.) servirán como un paso importante a la hora de interpretar y evaluar el comportamiento de los bosques mediterráneos frente a futuros cambios en el clima. La inclusión de la densida...