Probability of germination after heat treatment of native Spanish pines

Escudero, Adrián; Sanz, María Victoria; Pita, J. M.; Pérez-García, Francisco J.

doi:10.1051/forest:19990608

Cited by 49 publications

(46 citation statements)

References 44 publications

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“…Their effect on germination was either null or inhibitory. Similar results were obtained by [8,15,16,26,28,31,32,35,36,37,44], in different species of pines and eucalyptus.…”

Section: Discussionsupporting

confidence: 76%

The influence of seed age on germinative response to the effects of fire in Pinus pinaster, Pinus radiata and Eucalyptus globulus

Reyes

Casal

2001

Ann. For. Sci.

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-The aim of this study was to understand the germinative response to fire of three species of seeds of different ages. An experiment was designed in which mature seeds of Pinus pinaster, P. radiata and Eucalyptus globulus were matured and stored in four consecutive years (1990, 1991, 1992 and 1993) and then subjected to high temperatures, the addition of ash, and both factors together. A control treatment for the seeds of each age and species was also performed. Significant differences were observed between the species. The germinative behaviour of seeds subjected to different factors involved in forest fires varied according to the age or the year of collection. This variation was more pronounced in some species than in others. For E. globulus the germination rate followed biannual cycles in which a year with low values followed a year with high values. In nearly all the species, sensitivity to factors related to forest fires increased with age.P. pinaster / P. radiata / E. globulus / germination / fire / seed age Résumé. -Influence de l'âge de la semence sur sa réponse germinative aux effets d'incendie chez Pinus pinaster, P. radiata et Eucalyptus globulus. L'objet de cette étude était de déterminer les effets du feu sur la germination de graines conservées plus ou moins longtemps. Des graines de Pinus pinaster, P. radiata et E. globulus récoltées mûres et conservées pendant quatre années consécutives (1990, 1991, 1992 et 1993) ont été exposées à des chocs thermiques, à des cendres et aux deux facteurs combinés. Un traitement témoin était prévu pour chaque durée de conservation. Des différences significatives ont été observées entre les espèces. La réponse germinative de graines soumises aux facteurs liés aux incendies varie en fonction de l'espèce et de l'âge des graines. Chez E. globulus le taux de germination suit des cycles bisannuels. Pour la plupart des espèces étudiées la sensibilité aux effets d'incendie s'accroit avec l'âge des semences.P. pinaster / P. radiata / E. globulus / germination / feu / âge de la semence

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“…Their effect on germination was either null or inhibitory. Similar results were obtained by [8,15,16,26,28,31,32,35,36,37,44], in different species of pines and eucalyptus.…”

Section: Discussionsupporting

confidence: 76%

The influence of seed age on germinative response to the effects of fire in Pinus pinaster, Pinus radiata and Eucalyptus globulus

Reyes

Casal

2001

Ann. For. Sci.

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“…Their thick bark and the absence of branches in the lower part of the crown allow them to survive low-severity fires (Tapias et al 2001(Tapias et al , 2004Fernandes et al 2008;Fule et al 2008). However, the lack of serotinous cones (Tapias et al 2001(Tapias et al , 2004, the low survival rate of the seeds after heating (Escudero et al 1999) and their short dispersal distances (Ordonez et al 2006) make them very sensitive to crown fires. Empirical research on post-fire regeneration dynamics conducted in several sub-Mediterranean areas of Iberia have shown that P. sylvestris and P. nigra stands have been replaced by Quercus woodlands, shrublands or even grasslands several years or decades after the occurrence of wildfire (Retana et al 2002;Rodrigo et al 2004;Pérez-Cabello et al 2010).…”

Section: Responses Of Highland Pines To Fire and Anthropogenic Pressurementioning

confidence: 99%

Negative responses of highland pines to anthropogenic activities in inland Spain: a palaeoecological perspective

Rubiales

Morales‐Molino

Álvarez

et al. 2011

Veget Hist Archaeobot

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Palaeoecological evidence indicates that highland pines were dominant in extensive areas of the mountains of Central and Northern Iberia during the first half of the Holocene. However, following several millennia of anthropogenic pressure, their natural ranges are now severely reduced. Although pines have been frequently viewed as first-stage successional species responding positively to human disturbance, some recent palaeobotanical work has proposed fire disturbance and human deforestation as the main drivers of this vegetation turnover. To assess the strength of the evidence for this hypothesis and to identify other possible explanations for this scenario, we review the available information on past vegetation change in the mountains of northern inland Iberia. We have chosen data from several sites that offer good chronological control, including palynological records with microscopic charcoal data and sites with plant macro-and megafossil occurrence. We conclude that although the available longterm data are still fragmentary and that new methods are needed for a better understanding of the ecological history of Iberia, fire events and human activities (probably

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“…In accordance with others authors the shrub seeds were subjected to the following treatments: 50 ºC, 75 ºC, 100 ºC and 125 ºC for 1, 5, 10 and 15 minutes and a control treatment. The control was included in the data analysis as 20 ºC and one minute following Escudero et al [14]. As we use a modeling approach (see below), the use of different temperature and time exposure values for each species doesn't matter.…”

Section: Methodsmentioning

confidence: 99%

“…Logistic regression is a straightforward method of analysing processes such as death, survival or germination and has been used previously in forest ecology [5,14]. The exposure time to the thermal treatment and the temperature at which the seeds were subjected were used as explanatory variables.…”

Section: Methodsmentioning

confidence: 99%

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Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire

2003

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-Knowledge of the regeneration of competing shrub species after wildfire in Scots pine stands is essential for the regeneration of this tree species. The germination capability of seeds is modified by the temperature reached during a fire and the length of time that seeds are subjected to high temperatures. The probability of germination was studied in the laboratory for Scots pine (Pinus sylvestris) and four shrub species characteristic of the understory in Scots pine stands in northern Spain (Cistus laurifolius, Halimium umbellatum, Halimium alyssoides and Genista florida). Germination probability was studied with a logistic model that uses duration of exposure to the fire, the temperature and the interaction of both as independent variables. Results show a higher germination rate in shrub species at high temperature than for Scots pine. Thus by limiting competition between Scots pine and understory species, using prescribed burning or mechanical site preparation, Scots pine can regenerate successfully and quickly. This model can aid management decisions in this area.germination / scots pine / shrub species / thermal shock Résumé -Prédiction des probabilités de germination après le feu de Pinus sylvestris L. et de quatre espèces de garrigue. La régénération des espèces de garrigue après le feu est un facteur déterminant pour la réinstallation de Pinus sylvestris. La température pendant l'incendie et la durée de l'exposition modifient la capacité de germination des graines. Nous avons étudié au laboratoire la germination de Pinus sylvestris et de quatre espèces de garrigue (Cistus laurifolius, Halimium umbellatum, Halimium alyssoides et Genista Florida) qui sont typiques des forêts dominées par Pinus sylvestris. Afin de définir les probabilités de germination, on a utilisé la durée de l'exposition, la température et son interaction comme variables indépendantes, dans un modèle logistique. Les résultés de la germination suggèrent que les graines des espèces de garrigue présentent une meilleure germination après exposition à des hautes températures que les graines de Pinus sylvestris. En conséquence, les feux prescrits ou les entretiens mécaniques peuvent provoquer une régénération plus rapide et plus satisfaisante de Pinus sylvestris. dynamique de germination / Pinus sylvestris / espèces du maquis / feu de forêt

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Probability of germination after heat treatment of native Spanish pines

Abstract: -Spanish pine forests exhibit a high degree of resilience to frequent wildfires. For this reason

Cited by 49 publications

References 44 publications

The influence of seed age on germinative response to the effects of fire in Pinus pinaster, Pinus radiata and Eucalyptus globulus

The influence of seed age on germinative response to the effects of fire in Pinus pinaster, Pinus radiata and Eucalyptus globulus

Negative responses of highland pines to anthropogenic activities in inland Spain: a palaeoecological perspective

Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire

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