Diversification of Pinus halepensis forests by sowing Quercus ilex and Quercus pubescens acorns: testing the effects of different vegetation and soil treatments

2010 ◽  
Vol 130 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Bernard Prévosto ◽  
Yogan Monnier ◽  
Christian Ripert ◽  
Catherine Fernandez
Keyword(s):  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Quercus Pubescens

Mediterranean trees vulnerability to climate change will not be minimized through hydraulic safety traits adjustments.

2021 ◽  
Author(s):  
Myriam Moreno ◽  
Guillaume Simioni ◽  
Jean-Marc Limousin ◽  
Jesus Rodriguez-Calcerrada ◽  
Julien Ruffault ◽  
...  
Keyword(s):  
Climate Change ◽  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Rooting Depth ◽  
Quercus Pubescens ◽  
Widespread Species ◽  
Turgor Loss Point ◽  
Safety Margins ◽  
Significant Difference ◽  
Hydraulic Safety

<p><span>Climate change in the Mediterranean region leads to an intensification of summer droughts. These episodes of extreme water stress threaten the survival of tree species and, by the same token, would affect the structure and ecosystem services of woodlands. Indeed, in conditions of prolonged and intense drought, one of the major risks for trees is the hydraulic failure due to high embolism level. Xylem embolism risk depends essentially on various leaf and hydraulic traits including (i) the vulnerability of their xylem to cavitation, (ii) the turgor loss point (a surrogate for stomatal control) and (iii) their cuticular transpiration (gmin). The two former traits can be used to compute hydraulic safety margins (HSM). </span></p><p><span>In order to assess whether trees will survive future climatic conditions, it is necessary to quantify and assess the plasticity of these traits to intensified drought. In this study, we used three rainfall exclusion experiments established in mature forests in south-eastern France (Font-blanche, Puéchabon and O3HP experimental sites) to measure these traits and evaluate their ability to adjust to aggravated drought conditions for three Mediterranean widespread species: </span><span><em>Quercus ilex</em></span><span>, </span><span><em>Quercus Pubescens</em></span><span>, and </span><span><em>Pinus halepensis</em></span><span>. We performed pressure-volume curves of trees from rainfall exclusion and control plots to see if adjustments of gmin and leaf hydraulic traits involved in stomatal regulation occurred in these three species. Using the optical method and cavitron, we also quantified the plasticity of xylem vulnerability to cavitation by comparing the values of water potential leading to a 50% reduction in plant hydraulic conductance (P50). </span></p><p><span>Our results show that </span><span><em>Quercus pubescens</em></span><span> has the lowest HSM while </span><span><em>Quercus ilex</em></span><span> has the highest. In addition, gmin is higher for </span><span><em>Quercus pubescens</em></span><span> than for the other two species. All together these results suggest that </span><span><em>Quercus pubescens</em></span><span> is the most vulnerable to drought among the three studied. Globally, for most traits and species no significant difference was found between treatments. The only exception was for </span><span><em>Quercus ilex</em></span><span> that exhibited lower turgor loss point (Ψtlp) in the dry treatment. Drought acclimation for these species may rather depend on other traits, such as leaf area reduction or rooting depth. To integrate the role of these traits to estimate the historic and future mortality risk for these species, the use of hydraulic based models will be of interest. </span></p>

scholarly journals Litter traits and rainfall reduction alter microbial litter decomposers: the evidence from three Mediterranean forests

2019 ◽  
Author(s):  
S Pereira ◽  
A Burešová ◽  
J Kopecky ◽  
P Mádrová ◽  
A Aupic-Samain ◽  
...  
Keyword(s):  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Community Change ◽  
Mediterranean Forests ◽  
Quercus Pubescens ◽  
Forest Sites ◽  
Litter Traits ◽  
Drought Conditions ◽  
Rainfall Reduction ◽  
Total Bacteria

Abstract The objective of the study was to evaluate changes in microbial communities with the predicted arrival of new species to Mediterranean forests under projected intensification of water stress conditions. For that, litter from three Mediterranean forests dominated respectively by Quercus pubescens Willd., Quercus ilex L. and Pinus halepensis Mill. was collected, and placed to their ‘home’ forest but also to the two other forests under natural and amplified drought conditions (i.e. rainfall reduction of 30%). Quantitative PCR showed that overall, actinobacteria and total bacteria were more abundant in Q. pubescens and Q. ilex than in P. halepensis litter. However, the abundance of both groups was dependent on the forest sites: placement of allochthonous litter to Q. pubescens and P. halepensis forests (i.e. P. halepensis and Q. pubescens, respectively) increased bacterial and fungal abundances, while no effect was observed in Q. ilex forest. P. halepensis litter in Q. pubescens and Q. ilex forests significantly reduced actinobacteria (A/F) and total bacteria (B/F) to fungi ratios. The reduction of rainfall did not influence actinobacteria and bacteria but caused an increase of fungi. As a result, a reduction of A/F ratio is expected with the plant community change towards the dominance of spreading P. halepensis under amplified drought conditions.

Biomass of understory species of Pinus halepensis Mill. forests in the Kassandra Peninsula - Chalkidiki

1998 ◽  
Vol 63 ◽  
Author(s):  
P. Smiris ◽  
F. Maris ◽  
K. Vitoris ◽  
N. Stamou ◽  
P. Ganatsas
Keyword(s):  
Moisture Content ◽  
Aboveground Biomass ◽  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Biomass Estimation ◽  
Regression Equations ◽  
Pistacia Lentiscus ◽  
Quercus Coccifera ◽  
Understory Species ◽  
Cistus Incanus

This  study deals with the biomass estimation of the understory species of Pinus halepensis    forests in the Kassandra peninsula, Chalkidiki (North Greece). These  species are: Quercus    coccifera, Quercus ilex, Phillyrea media, Pistacia lentiscus, Arbutus  unedo, Erica arborea, Erica    manipuliflora, Smilax aspera, Cistus incanus, Cistus monspeliensis,  Fraxinus ornus. A sample of    30 shrubs per species was taken and the dry and fresh weights and the  moisture content of    every component of each species were measured, all of which were processed  for aboveground    biomass data. Then several regression equations were examined to determine  the key words.

Plastic bimodal growth in a Mediterranean mixed-forest of Quercus ilex and Pinus halepensis

2021 ◽  
pp. 125836
Author(s):  
Filipe Campelo ◽  
Montse Ribas ◽  
Emilia Gutiérrez
Keyword(s):  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Mixed Forest

scholarly journals Light transmissivity of tube shelters affects root growth and biomass allocation of Quercus ilex L. and Pinus halepensis Mill

2013 ◽  
Vol 71 (1) ◽  
pp. 91-99 ◽  
Author(s):  
Alberto Vázquez de Castro ◽  
Juan A. Oliet ◽  
Jaime Puértolas ◽  
Douglass F. Jacobs
Keyword(s):  
Root Growth ◽  
Biomass Allocation ◽  
Quercus Ilex ◽  
Pinus Halepensis
Sign in / Sign up

Export Citation Format

Share Document