Structural characterization and analysis of the regeneration of woodlands dominated by Juniperus oxycedrus L. in west-central Spain

Lacambra, Luis Carlos Jovellar; Fernández‐de‐Uña, Laura; Santos, M. Mezquita; Lerma, F. Bolaños López de; Emeterio, V. Escudero San

doi:10.1007/s11258-012-0146-x

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…Species survival and distributional shifts are ultimately determined by the species ability to produce viable seeds and regenerate. P. pinaster and J. oxycedrus are considered pioneer species and their establishment is generally related to disturbances (Tapias et al, 2004;Jovellar Lacambra et al, 2013) as shown by the increase in the number of sampled trees in both species after the release in 1950s ( pinaster and J. oxycedrus regeneration. In contrast, more shade-tolerant P. pinea exhibited constant establishment rates, regardless of disturbance intensity.…”

Section: Low Regeneration Shows Regression Of Species With Lowest Dro...mentioning

confidence: 99%

“…The observed P. pinaster decline may be a consequence of human intervention favouring its presence in areas that are currently out of the species natural ecological range due to climate change (Barberó et al, 1998;López-Sáez et al, 2014). In the case of J. oxycedrus, the reduction of rural activities such as grazing may also have favoured its expansion in the area (Jovellar Lacambra et al, 2013).…”

Section: Low Regeneration Shows Regression Of Species With Lowest Dro...mentioning

confidence: 99%

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Vulnerability to drought of mediterranean conifers under global change scenarios

Núñez¹

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Rising CO2 atmospheric concentration ([CO2]) as a consequence of anthropogenic emissions is driving an increase in the average temperature of the planet. The Mediterranean basin is particularly sensitive to more intense disturbances due to aridification and land-use legacies that have strongly shaped the current landscapes in the Region. In this context of global change, we studied the decline and regeneration dynamics of three co-occurring Mediterranean coniferous species of different drought tolerance: Pinus pinaster < Pinus pinea < Juniperus oxycedrus (Chapter 2). We compared the growth patterns and climatic response of trees with different health status: healthy (for the three species), declining (only P. pinaster) and dead (P. pinaster and P. pinea). The currently dominant species, P. pinaster, shows extensive signs of decline -assessed by high canopy defoliation and mistletoe infection-and mortality. In addition, the species presents scarce regeneration, whereas it is being replaced by Quercus ilex, P. pinea and J. oxycedrus, with more abundant regeneration and abundance in juvenile stages. Since the 1980s, more frequent and severe drought events have occurred, inciting tree growth decline in dead and non-healthy pine trees, but with differences between species. Nonhealthy individuals of P. pinaster exhibited negative growth trends since 1995. In dead P. pinea trees, the growth decline started later since 2005. P. pinaster survival in the study area was linked to a higher sensitivity to spring precipitation and was concentrated in sites with higher moisture availability, while P. pinea survival was higher in trees with larger diameters. In Chapter 3, we selected 5 individuals from each status and species and studied the xylem anatomical traits and carbon isotopic discrimination ( 13 C) in annual tree-rings. Pine trees exhibited larger tracheids and higher xylem plasticity to climate variability than J. oxycedrus. Xylem traits differed between different health status in Pinus pinaster and Pinus pinea. Healthy pine trees had bigger lumen sizes in the earlywood and thicker cell walls in the latewood than non-healthy trees, along with expressing a higher xylem plasticity to climate. This xylem plasticity allowed P. pinea to adjust their xylem characteristics to increase cell safety during drought events. The ability to maintain a competitive yet plastic xylem structure is crucial to sustain productivity rates under more xeric, climate change scenarios. Our study revealed that non-healthy pines (i.e. declining and dead pine trees) and healthy trees exhibited similar  13 C, which suggests that non-healthy pine trees had low stomatal control to maximize photosynthesis and increase water transport to the crown to compensate for the excessive water loss.

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Section: Low Regeneration Shows Regression Of Species With Lowest Dro...mentioning

confidence: 99%

Section: Low Regeneration Shows Regression Of Species With Lowest Dro...mentioning

confidence: 99%

Vulnerability to drought of mediterranean conifers under global change scenarios

Núñez¹

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Modelling the influence of light, water and temperature on photosynthesis in young trees of mixed Mediterranean forests

Mayoral¹,

Calama²,

Sánchez-González³

et al. 2015

New Forests

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Initial constraints in seedling dynamics of Juniperus macrocarpa Sm.

2014

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The micro-forests dominated by Juniperus\ud macrocarpa inhabiting coastal dunes in the Mediterranean\ud Basin are European priority habitats. Their\ud conservation is hindered by both anthropic and natural\ud causes, although the regeneration problems for J.\ud macrocarpa are still poorly understood. In this study,\ud several factors influencing emergence and mortality of\ud J. macrocarpa seedlings were investigated. For this\ud purpose, permanent plots were placed in coastal dunes\ud of Sardinia (Italy) and periodically monitored to\ud record seedling parameters (emergence, survival and\ud growth), as well as several biotic and abiotic variables\ud (solar radiation, tree cover, herbaceous plus scrub\ud cover, number of female cones on the soil and number\ud of herbivory traces). Linear mixed models were fitted\ud to test the effects of several types of explanatory\ud variables on seedling dynamics. A total of 536\ud seedlings were marked, most of which emerged in\ud winter. The microhabitat was the most important\ud factor in models explaining emergence, with the\ud number of emerged seedlings decreasing with solar\ud radiation. Survival was very low, reaching the highest\ud mortality percentage in the first summer. Herbivory\ud and location in open interspaces had significant\ud negative effects on seedling survival. In conclusion,\ud the recruitment of J. macrocarpa is highly limited in\ud the initial life cycle phases, with microhabitat and\ud herbivory constraints influencing seedling dynamics.\ud The identification of critical stages in the recruitment\ud process of J. macrocarpa, together with factors\ud influencing them, suggests some implication for\ud management as well the hypotheses for future studies\ud about conservation and recovery of the J. macrocarpa\ud habitat

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Structural characterization and analysis of the regeneration of woodlands dominated by Juniperus oxycedrus L. in west-central Spain

Cited by 7 publications

References 30 publications

Vulnerability to drought of mediterranean conifers under global change scenarios

Vulnerability to drought of mediterranean conifers under global change scenarios

Modelling the influence of light, water and temperature on photosynthesis in young trees of mixed Mediterranean forests

Initial constraints in seedling dynamics of Juniperus macrocarpa Sm.

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