Effects of high temperatures and ash on seed germination of two Iberian pines (Pinus nigra ssp salzmannii, P sylvestris var iberica)

Escudero, Adrián; Barrero, Sandra Hernández; Pita, J. M.

doi:10.1051/forest:19970605

Cited by 43 publications

(25 citation statements)

References 11 publications

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“…This probability is considerably reduced at higher temperatures and high exposure times. These results correspond with those reported by Escudero et al [13] that show that temperatures above 70 ºC and an exposure time of 5 minutes are lethal to germination. Reyes and Casal [31,32] found that the critical point must be located between 90 ºC/1 min and 90 ºC/5 min.…”

Section: Discussionsupporting

confidence: 82%

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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Section: Discussionsupporting

confidence: 82%

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

2003

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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: 77%

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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“…A temperature range between 120°C and 150°C has been reported in failed GC of Scots pine seeds from Spain (Habrouk et al, 1999; Effect of seed mass and number of cotyledons after heat treatment on germination in Pinus sylvestris 487 Escudero et al, 1997;Núñez & Calvo, 2000). Our results showed that heat treatments at 125°C for 5 min on healthy Iberian Scots pine seeds resulted in null germination.…”

Section: Discussionsupporting

confidence: 56%

“…A. Molina / Forest Systems (2014) class; 7) 125°C, 5 min, I class; 8) 125°C, 5 min, II class; 9) 150°C, 1 min, I class; 10) 150°C, 1 min, II class; 11) 150°C, 5 min, I class; 12) 150°C, 5 min, II class; 13) 175°C, 1 min, I class; 14) 175°C, 1 min, II class; 15) 175°C, 5 min, I class; 16) 175°C, 5 min, II class; 17) control, I class; 18) control, II class. These temperatures were chosen because they are commonly used in Scots pine germination studies to reproduce natural fire conditions (Habrouk et al, 1999;Escudero et al, 1997;Núñez & Calvo, 2000). Four replicates of 50 seeds each were used for each treatment and placed on Petri dishes.…”

Section: Experimental Designmentioning

confidence: 99%

Effect of seed mass and number of cotyledons on seed germination after heat treatment in Pinus sylvestris L. var. iberica Svob.

Castoldi

Molina

2014

For. syst.

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Aim of study: We investigated the combined effect of seed mass and number of cotyledons on the seed germination of Pinus sylvestris var. iberica (Iberian Scots pine) in simulated fire conditions.Material and Methods: We used 3,600 fresh seeds extracted from 158 cones obtained from 10 pine trees located at the Biological Station of the Complutense University (Guadarrama mountains, Madrid region). All the seeds were individually weighed and assigned to one of the two following seed mass classes: class I (1.6-12.5 mg) and class II (12.6-145.0 mg). Germination capacity (GC) and mean germination time (MGT) were studied in combined experiments of four different temperatures (100°, 125°, 150° and 175°C) and two exposure times (1 and 5 minutes) together with a control (no treatment). Four replicates of 50 seeds each were used for each treatment and hydrated daily for 14 days to germinate under constant illumination. The number of cotyledons was counted in seedlings.Main results: Germination was depressed at above 125°C for 5 min. GC and MGT were negatively related, and were influenced by temperature and exposure time. Seed mass was found to have a significant effect on GC at some moderate heat treatment but not on MGT. The number of cotyledons was positively correlated to seed mass but there was not found correlated with germination after seed heat treatments.Research highlights: In the case of the Iberian Scots pine, higher seed mass mitigate the negative effects of temperature on seed germination after moderate heat treatment simulating fire.Keywords: Fire disturbance; germination; Mediterranean mountains; Pinus sylvestris L. var. Iberica; temperature.

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Effects of high temperatures and ash on seed germination of two Iberian pines (Pinus nigra ssp salzmannii, P sylvestris var iberica)

Cited by 43 publications

References 11 publications

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

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

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

Effect of seed mass and number of cotyledons on seed germination after heat treatment in Pinus sylvestris L. var. iberica Svob.

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