Reproduction de pinèdes de Pinus halepensis Mill. six ans après incendies et traitements sylvicoles

Heras, Jorge de las; Moya, Daniel; López‐Serrano, Francisco R.; Condés, Sonia

doi:10.1051/forest:2006088

Cited by 26 publications

(14 citation statements)

References 34 publications

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“…Differences in germination percentages for seeds collected from serotinous and nonserotinous cones have also been noted in other studies [15,24]. In this study the significant differences in viability values (Tetrazolium method) between seeds from each cone type were also recorded.…”

Section: Discussionmentioning

confidence: 52%

Influence de la densité du peuplement et de la fertilité de la station sur la dynamique de reproduction de Pinus halepensis Mill., dix ans après d’importants incendies

et al. 2007

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-In Spain, many Pinus halepensis Mill. forests have been seriously affected by significant forest fires in the past decade, in 1994 alone, more than 100 000 ha were burned in Eastern Spain. In order to study the reproductive characteristics of P. halepensis after forest fires, six locations were selected in four areas affected by serious fires in the summer of 1994, and the following different precipitation zones were studied: dry-subhumid, dry and semi-arid. Ten years after the fires, data relevant to the production of pine cones: serotinous (grey), mature (brown), immature (green) and opened cones, was collected from areas with natural post-fire regeneration. Various cone and seed characteristics, such as pine cone seed number and weight, and germination percentage, were measured. The results showed greater production of cones and strobili in high-density sites. The biggest cone sizes (volume) and seed number per cone were related to site quality (dry-subhumid precipitation zone). Also, viability and germination percentages were higher with better site quality, with significant differences in values for serotinous and non-serotinous cones. Despite these differences, the canopy seed bank was large enough to ensure regeneration in this area for this age stand.Pinus halepensis / serotiny / canopy seed bank / natural regeneration Résumé -Influence de la densité du peuplement et de la fertilité de la station sur la dynamique de reproduction de Pinus halepensis Mill., dix ans après d'importants incendies. En Espagne, dans les dix dernières années, de nombreuses forêts de Pin d'Alep ont été gravement touchées par d'importants feux de forêt. Rien qu'en 1994, plus de 100 000 ha ont brûlé dans l'est de l'Espagne. Dans le cadre d'une étude de la dynamique de la reproduction du Pin d'Alep après incendie, six sites, situés dans des zones de feux de forêt survenus lors de l'été 1994, ont été observés. Ces sites présentent des niveaux de précipitations différents : sec à sub-humide, sec et semi-aride. Dix ans après incendie, des données concernant la production de cônes de pin : sérotineux (gris), mûrs (marrons), immatures (vert) et cônes ouverts, ont été collectées dans des zones de régénération naturelle. Diverses caractéristiques des cônes et des graines ont été relevées : nombre et poids des cônes et des graines, taux de germination. Les résultats révèlent une production importante de cônes et de strobiles dans les sites à forte densité de pin. Le volume des cônes et le nombre de graines par cône étaient liés à la fertilité de la station (zone sèche à sub-humide). Les taux de viabilité et de germination étaient aussi plus importants dans les zones présentant le plus de précipitations et des écarts significatifs ont été observés entre les valeurs de cônes sérotineux et non sérotineux. Malgré ces différences, les banques de graines dans les peuplements étaient suffisamment importantes pour assurer la régénération du pin dans cette zone.Pinus halepensis / sérotine / banque de graines de la canopée / régénération na...

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Section: Discussionmentioning

confidence: 52%

Influence de la densité du peuplement et de la fertilité de la station sur la dynamique de reproduction de Pinus halepensis Mill., dix ans après d’importants incendies

et al. 2007

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“…The main strategies for adaptation to fire in this species are early flowering and storage of a large quantity of seeds in serotinous cones to protect them from fire events (Tapias et al 2001;Moya et al 2008c). These characteristics are influenced by site quality, stand age, tree density 2008b), and forest management (González-Ochoa et al 2004;De las Heras et al 2007). Tree density reduction modifies inter-and the intra-specific competition and alters the availability of water, light and nutrients in Aleppo pine forests (López-Serrano et al 2005;2006).…”

Section: Introductionmentioning

confidence: 98%

Structural patterns and biodiversity in burned and managed Aleppo pine stands

et al. 2008

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Increasing anthropic pressure is making forest fires more frequent in the Mediterranean Basin and therefore affecting the response of native flora and fauna. Two large fires occurred in summer, 1994, in the Southeastern Iberian Peninsula. Aleppo pine, the main tree species, regenerated naturally after the fire. In this study we are interested in strategies for maximizing Aleppo pine tree recovery and conservation of its ecosystem. We performed thinning and pruning in the pine tree stands 5 and 10 years after the fire and took measurements on structural patterns and plant diversity using several indices. In addition, we measured macro-lichen and faunal diversity indirectly. Results show significant differences between treated-burned plots and untreatedunburned plots. The plots thinned 10 years after the fire and the unburned plots (mature stands) showed a regular, non-aggregated distribution and a low diameter differentiation. Also, these plots showed similar plant diversity values. The silvicultural treatments did not significantly affect the fauna and lichen index values. The high intensity of thinning and late pruning applied to young Aleppo pine stands improved the structural pattern and plant diversity.

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“…The relationship between tree height and trunk diameter has been proven in several ages and locations for Aleppo pine [4,16]. It is difficult to compare pine tree development in stands with the same age in different locations; this has caused there to be a low number of studies relating allometric parameters to site quality [6,13,19].…”

Section: Discussionmentioning

confidence: 99%

“…Low pine tree density induces a lower intraspecific competition, so a higher amount of water, light and nutrients are available for the individuals. Also, many studies demonstrated that high fire recurrence, high pine tree density and low availability of water, light and nutrients promotes serotiny [17], but this factor is also related to trunk diameter and age [4,8].…”

Section: Discussionmentioning

confidence: 99%

Aleppo pine regeneration after fire along an aridity gradient

Heras

Moya

López‐Serrano

et al. 2008

WIT Transactions on Ecology and the Environment

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In the Mediterranean Basin, the number of large-scale fires and, consequently, the area of regenerated forests after a fire have been increasing over the last few decades. Mediterranean pine tree stand regeneration shows differences in growth and reproductive characteristics depending on site quality. Aleppo pine (Pinus halepensis Mill.) is an important obligate seeder species occupying a large surface in this area. In order to study growth and reproductive characteristics depending on different climatic conditions, six sites with similar characteristics (edaphic, exposure, slope) burned in the summer of 1994 were selected along a climate gradient. Different precipitation values determined three different ombroclimates: dry-subhumid, dry and semi-arid. Ten years after the fires, data on growth and cone production were collected from these areas in order to study the pattern of growth and reproduction and the influence of site quality (climate) on them.Results showed significantly higher values for growth and several cone characteristics; furthermore, they were positively related to site quality. Viability and seed germination percentages were higher in sites located in dry-subhumid areas. Serotiny was highest in dry locations (southern sites), and lower percentages were found in low tree density sites. The number of reproductive trees was higher northwards and the reproductive phase was reached in younger stands with lower tree density. In conclusion, results showed a geographical gradient based upon growth and reproductive characteristics, decreasing southwards in contrast to serotiny, which increases in southern sites. Density was found to be a significant factor influencing overall pine stand development.

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Reproduction de pinèdes de Pinus halepensis Mill. six ans après incendies et traitements sylvicoles

Cited by 26 publications

References 34 publications

Influence de la densité du peuplement et de la fertilité de la station sur la dynamique de reproduction de Pinus halepensis Mill., dix ans après d’importants incendies

Influence de la densité du peuplement et de la fertilité de la station sur la dynamique de reproduction de Pinus halepensis Mill., dix ans après d’importants incendies

Structural patterns and biodiversity in burned and managed Aleppo pine stands

Aleppo pine regeneration after fire along an aridity gradient

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