Relations entre la qualité du liège, sa composition minérale et la composition minérale des feuilles du chêne-liège (Quercus suber L.)

Courtois, M.; Masson, Philippe

doi:10.1051/forest:19990609

Cited by 6 publications

(10 citation statements)

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“…Although no relationship has been reported in the literature we could access, the study stresses a positive correlation between cork quality and phosphorus, probably due to its role in cellular multiplication and lignification processes (Martin Prevel 1978;Harris et al 1999). We could not support the positive influence of potassium reported by Courtois and Masson (1999), since the variability for this element was limited.…”

Section: Discussioncontrasting

confidence: 50%

“…Dettori et al (1996) found a negative correlation between soil depth and cork quality expressed as a score derived from the sum of 15 physical and mechanical parameters. Courtois and Masson (1999), studying the relationships among cork quality, its mineral composition and the mineral composition of cork oak leaves, found a positive correlation between cork potassium content and cork quality. Elevation, in the data set analysed here, ranged from 120-830 m a.s.l., offering a good representation of cork production areas in Sardinia.…”

Section: Discussionmentioning

confidence: 99%

“…It has also been acknowledged that environment influences cork quality (Isasa 1959;Ahmed 1994;Dettori et al 1996;Courtois and Masson 1999). Particularly, conditions favouring an intense vegetative activity may cause an increase in the diameter of lenticels and a decrease in the commercial value of the cork (Natividade 1950).…”

Section: Introductionmentioning

confidence: 99%

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Site quality evaluation by classification tree: an application to cork quality in Sardinia

et al. 2005

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Cork harvesting and stopper production represent a major forest industry in Sardinia (Italy). The target of the present investigation was to evaluate the ''classification tree'' as a tool to discover possible relationships between microsite characteristics and cork quality. Seven main cork oak (Quercus suber) producing areas have been identified in Sardinia, for a total of more than 122,000 ha. Sixty-three sample trees, distributed among different geographical locations and microsite conditions, were selected. A soil profile near each sample tree was described, soil samples were collected and analysed. After debarking, cork quality of each sample tree was graded by an independent panel of experts. Microsites where trees had more than 50% of the extracted cork graded in the best quality class, according to the official quality standard in Italy, were labelled as prime microsites, the others as nonprime microsites. Relationships between a binary dummy variable (0 for nonprime microsites, 1 for prime microsites) and site factors were investigated using classification tree analysis to select the relevant variables and to define the classification scheme. Prime quality microsites for cork production proved to be characterised by elevation, soil phosphorus content and sandiness. Results have been compared with those of the more conventional parametric approach by logistic regression. The work demonstrates the advantages of the classification tree method. The model may be appropriate for classifications at landscape and stand mapping levels, where it is possible to sample a number of microsites and to evaluate distributional characteristics of model output, while its precision is only indicative when estimating the prime quality of single microsites.

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Section: Discussioncontrasting

confidence: 50%

Section: Discussionmentioning

confidence: 99%

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Site quality evaluation by classification tree: an application to cork quality in Sardinia

et al. 2005

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“…According to several authors, environment influences cork quality (Isasa 1959;Ahmed 1994;Dettori et al 1996;Courtois and Masson 1999;Pizzurro and Maetzke 2009) and the conditions favouring an intense vegetative activity may cause an increase in the diameter of lenticels and a decrease in the commercial value of cork (Natividade 1950).…”

Section: Introductionmentioning

confidence: 98%

Characterization of Sardinian cork oak (Quercus suber L.) genetic resources for economically important traits

Bullitta

Dettori²,

Manchinu³

et al. 2010

Genet Resour Crop Evol

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Considering the very high socio economic value of cork oak (Quercus suber L.) in Mediterranean areas, a better knowledge of local genetic resources is necessary in order to reach a good balance between the conservation issues and the need of an efficient cork production network. In such frame, local germplasm of Q. suber from the main cork production areas of Sardinia was analysed for DNA and isozyme polymorphisms and for cork quality in relation to some environmental parameters. A total number of 24 sample stands of cork oak were selected, representing typical vegetation, sylvicultural and cork quality features within the eight identified cork growing areas in Sardinia. Considerable variation was found between cork oak stands of the different areas. Results of the principal component analysis performed on the cork quality data and environmental characters of the eight areas, showed that the first three components explain 72.2% of the variation. The major characters involved in this differentiation were cork quality characters such as dimensional recover, moisture and Mg content of the cork and also elevation of stands m a.s.l. for the first component. The second component appears to be determined by some climatic parameters (average annual temperature and average of the minimum temperatures of coldest month) and by the Fe and Zn in the cork. For the third component, major characters involved in differentiation are average annual rainfall, bark thickness and Ca content in the cork.

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“…It is also a forest with a health deficit and high tree density, located in a semiarid climate. In this situation, the decline is affecting the proper functioning of the phellogen, causing an increase in porosity, but not in the already low growth rate (Courtois and Masson, 1999).…”

Section: Discussionmentioning

confidence: 99%

Short Communication. Effect of the health status and geographical origin on the cork production characteristics of Western Algeria cork oak stands

Dahane¹,

Bouhraoua

Ceca³

et al. 2013

For. syst.

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Aim of study: To analyze the effect of health status on cork production, analyzing if this influence is uniform or is affected by site conditions.Area of study: Two Western Algerian cork tree forests have been studied: M’Sila located in the coastal plains under semiarid climate, and Zarieffet, located in the mountainous interior under sub-humid climate.Material and Methods: 40 trees were selected in each forest and classified according to their health status as healthy, weakened, or decaying. A sample of cork from each tree has been obtained to measure the key variables related to cork production. A two-way ANOVA was performed considering two factors: site and health status.Main results: Quercus suber L. productivity is affected by the vitality of trees in the same way in both sources, showing values between 5.96 ± 7.1 kg • m-2 (coast, weakened trees) and 8.13 ± 0.45 kg • m-2 (mountain, healthy trees). The health status also affects the number and area of pores, especially in the cork oak groves of the coast, where the coefficient of porosity ranges from 3.79 ± 0.84% (healthy trees) to 8.11 ± 1.91% (decaying trees). The variables where the site has presented a stronger effect are those related to the amount of cork produced by the phellogen (density -kg·l-1, p<0.000- and productivity -kg·m-2, p=0.001-), and pore density (1·cm-2, p=0.001). Scrap thickness (mm) and porosity (%) show a smaller effect although still representative (p=0.041 and 0.038 respectively). Porosity and pore density show interaction site*health status. They all have higher values in the mountain (Zarieffet) than in the coast (M’Sila). The effect of tree vitality on the formation of pores in the cork oak phellogen is lower in the mountain than in the coast. No significant effects were found for any of the two factors neither on the annual growth rate nor on the thickness of the cork.Research highlights: Results lead to the conclusion that the effect of health status on traumatic phellogen formation and activity is clear but not uniform. Further studies are necessary for a deeper understanding of the effect of stress situations on pore formation and characteristics.Keywords: mean annual growth; density; productivity; porosity; decay

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Relations entre la qualité du liège, sa composition minérale et la composition minérale des feuilles du chêne-liège (Quercus suber L.)

Abstract: -Relationships between the quality of cork, its inorganic content and the inorganic content of the leaves of the corkoak (Quercus suber L.).

Cited by 6 publications

References 5 publications

Site quality evaluation by classification tree: an application to cork quality in Sardinia

Site quality evaluation by classification tree: an application to cork quality in Sardinia

Characterization of Sardinian cork oak (Quercus suber L.) genetic resources for economically important traits

Short Communication. Effect of the health status and geographical origin on the cork production characteristics of Western Algeria cork oak stands

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