Regeneration of a marginal Quercus suber forest in the eastern Iberian Peninsula

Pausas, Juli G.; Ribeiro, Eduardo Augusto Werneck; Dias, Sérgia; Pons, Josep; Beseler, C.

doi:10.1658/1100-9233(2006)17[729:roamqs]2.0.co;2

Cited by 14 publications

(11 citation statements)

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“…Nevertheless, natural forests throughout the Mediterranean Basin have been disturbed or destroyed by human activities, and nowadays they follow a fragmented distribution that occupies less than 10% of the area (Marchand 1990).Therefore, it has been encouraged to look for a better understanding of the natural regeneration processes in Mediterranean forests (Acácio et al 2007), because it is essential to know the ecological requirements for recruit establishment and growth, before trying to develop management and restoration strategies (Khurana and Singh 2001). Besides, little is known about the natural regeneration of Mediterranean Quercus species, as long as a noticeable part of the research has been carried out in the dehesa (savannah-like) agrosytems (Pons and Pausas 2006). Communicated by C. Ammer. Evaluating the natural regeneration is an integrative way of evaluating the Wtness and this gives an insight into the future of the populations under study (Pons and Pausas 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Besides, little is known about the natural regeneration of Mediterranean Quercus species, as long as a noticeable part of the research has been carried out in the dehesa (savannah-like) agrosytems (Pons and Pausas 2006). Communicated by C. Ammer. Evaluating the natural regeneration is an integrative way of evaluating the Wtness and this gives an insight into the future of the populations under study (Pons and Pausas 2006). The established trees in a Mediterranean forest have succeeded in a chain of processes, including dispersion, germination and emergence responses, and seedling growth and survival (Herrera et al 1994), but the regeneration requirements can be inferred from the microenvironmental conditions associated with the successful seedlings, saplings and juveniles of each species in their natural habitats (Marañón et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Influence of forest structure and environmental variables on recruit survival and performance of two Mediterranean tree species (Quercus faginea L. and Q. suber Lam.)

2008

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We investigated the regeneration requirements of the two dominant tree species in a mixed-oak forest of SW Portugal: Quercus suber (cork oak, evergreen) and Q. faginea (Portuguese oak, winter-deciduous). We hypothesized that (1) recruits of diVerent oak species are diVerentially inXuenced by soil and overstory variables and (2) diVerent factors explain the recruitment occurrence and performance of the same species. We sampled the recruits' height and diameter, and several environmental and forest structure variables of their microsites. Both recruitment occurrence and performance were modeled using generalized linear models. Our Wnal models predicted the probability of occurrence of recruits of Q. faginea and Q. suber with 74 and 82% of accuracy, respectively, and explained about 50% of the variance of their recruitment performance. The recruits of Q. faginea tended to occur in microsites with higher canopy height, canopy density and litter cover, and closer to both conspeciWc and heterospeciWc adults, while the opposite was true for recruits of Q. suber. The performance of recruits of Q. suber was favored by the higher litter cover (a good surrogate for N and P availability), but negatively aVected by the higher litter depth. We concluded the following: (1) there were signiWcantly diVerent regeneration niches for each species (Q. faginea and Q. suber); (2) the factors explaining the recruitment occurrence diVered from those explaining the recruitment performance; (3) the overstory plays a complex and important role in the regeneration process; (4) diVerent variables apparently related with the same environmental factor (e.g. litter cover and litter depth) could aVect recruits in an opposite way; (5) sensitive trade-oVs must be considered for delineating management actions, since they could favor the regeneration of Q. suber, but, at the same time, negatively aVect the regeneration of Q. faginea.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of forest structure and environmental variables on recruit survival and performance of two Mediterranean tree species (Quercus faginea L. and Q. suber Lam.)

2008

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“…Q. ilex is also a more resilient species, with a better tolerance for direct insolation and with very effective asexual reproduction through stump and root shooting. Recently, several studies on the regeneration of Mediterranean forest have been published (reviewed in Jordano et al, 2004), and some of them are centred on Q. ilex and Q. suber (Plieninger et al, 2003(Plieninger et al, , 2004Pulido and Díaz, 2005;Pausas et al, 2006;Pons and Pausas, 2006). However, these works have focused mainly on ecological aspects of regeneration, silviculture and land use, without addressing the genetic issues of dehesa regeneration.…”

Section: Introductionmentioning

confidence: 99%

Differences in fine-scale genetic structure and dispersal in Quercus ilex L. and Q. suber L.: consequences for regeneration of mediterranean open woods

2007

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Cork oak (Quercus suber L.) and holm oak (Q. ilex L.) are among the most important tree species (economically and ecologically) in the Western Mediterranean region, where they define unique open woods (created and maintained by man) known as 'dehesas' in Spain. However, these formations are under increasing threat due to the lack of regeneration. We have analysed spatial genetic structure in a mixed parkland; inferences about gene dispersal have also been performed, according to the isolation by distance model. Noticeable differences have been detected between the species, despite their similar ecological roles. Restricted effective dispersal leads to kin structures in cork oak, up to 70 m, while no genetic structure is observed in holm oak. Our results suggest a very effective dispersal for the latter, with a local historical gene flow estimated between 55 and 95 m. This is the first time regeneration of Mediterranean oak parklands has been assessed from a genetic perspective. Effective gene flow detected for holm oaks allows us to discount the risk of inbreeding over successive generations. Thus, regeneration of Q. ilex dehesas will just require action directed to help the settlement of the saplings (such as limiting grazing). However, in those cases where densities are too low, more intense forestation (such as plantation and/or establishment of appropriate shelter) will be needed. The 'density threshold' for initiating regeneration will probably be higher for cork oak, due to its more limited dispersal and minor full-light tolerance.

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“…optimal management system which links livestock, crops and forest [52,61] in order to reach a continuous economic yield (cork can only be extracted every ten years) and the permanent presence of cork oaks by planning and selecting their regeneration [62].…”

Section: Discussionmentioning

confidence: 99%

Forty-Four Years of Land Use Changes in a Sardinian Cork Oak Agro-Silvopastoral System: A Qualitative Analysis

Sedda

Delogu²,

Dettori³

2011

TOFSCIJ

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Abstract:The island of Sardinia is the biggest producer of natural cork in Italy. In this study, cork oak cover change is investigated in a typical agro-silvopastoral system where the main activities are cereal fodder and wheat cultivation, sheep rearing and cork exploitation.The research method is based on the comparison of two land use maps produced by photo-interpretation of digitised aerial photographs taken in 1954 and 1998, combined with interviews with local farmers, field surveys, and data collected from literature, administrative documentation and decadal censuses (at council level).The results show that the cork oak woodland surface decreased (-29%). It was substituted by other forest, ploughed land, and mixed grassland and shrubland. Apart from the transformation of the cork oak woodland to other forest, other changes have happened probably because of an increase in agricultural and pastoral activities as described by the documental material available for the same area.

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Regeneration of a marginal Quercus suber forest in the eastern Iberian Peninsula

Cited by 14 publications

References 2 publications

Influence of forest structure and environmental variables on recruit survival and performance of two Mediterranean tree species (Quercus faginea L. and Q. suber Lam.)

Influence of forest structure and environmental variables on recruit survival and performance of two Mediterranean tree species (Quercus faginea L. and Q. suber Lam.)

Differences in fine-scale genetic structure and dispersal in Quercus ilex L. and Q. suber L.: consequences for regeneration of mediterranean open woods

Forty-Four Years of Land Use Changes in a Sardinian Cork Oak Agro-Silvopastoral System: A Qualitative Analysis

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