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Contribution to the Study of the Health State of Holm Oak in the Chettaba Forest (Algeria)

Zerrouki Alia, Kara Karima, Rached-Kanouni Malika, Redjaimia Lilia, Touafchia Boutheyna

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 2

17--30

The oak forests in Algeria are rich in resources and services, playing an important ecological as well as socioeconomic role. The cork oak (Quercus ilex) is one of the most common species in the Chettaba forest, which occupies an area of 1127 hectares. This study aimed to assess the health of this species. The protocols for the crown condition indicator were placed in 13 plots of 0.09 hectares, randomly selected in the forest. The diameter and total height of each tree were measured, as well as the crown condition and stand density. A visual assessment of the crowns was performed following the ICP forests and DEPEFEU protocols. The results indicate that the overall condition of the crowns of the cork oak is a medium with significant defoliation. The crowns of the majority of trees (37.6%) are partially visible with backlighting only, codominant (36.54%), and competing with four sides (35%). More than 83.2% of the trees in the Chettaba forest have gourmets, even healthy trees, but fruiting is almost totally absent. Regarding the color of the crown, the majority of the trees examined show no discoloration. Under the current conditions of the conducted research, it can be said that the overall condition of the holm oak stands in the forest is a medium, which requires further research on the role of the many probable factors of decline. Therefore, special attention should be given to the preservation of this ecosystem.

Influence of climate on radial growth of Holm Oaks (Quercus ilex subsp. ballota Desf) from sw Spain

Patón D., García-Herrera R., Cuenca J., Galavis M., Roig F. A.

Geochronometria

2009

Vol. 34

49-56

A total of 47 trunk sections from Holm Oak (Quercus ilex subsp. ballota Desf) trees growing at two different sites at the Extremadura region (SW Spain) were considered in the computation of a regional tree-ring chronology useful to interpret the tree-ring/Mediterranean climate relationships. This is the first dendroclimatological research of Holm Oaks conducted to reveal its potential use as a climatic proxy. The obtained tree-ring chronologies were compared with climatic parameters based on monthly, seasonal and annual rainfall, and monthly maximum, minimum and average temperature. The best correlations were obtained with maximum temperatures during the period between previous winter and early spring. Influence of rainfall was less relevant. Growth of this species indicates a typical bimodal (spring and autumn) strategy that avoids low winter temperatures and summer drought. Despite some technical difficulties recognizing tree rings in Holm Oaks, its good sensitivity to climate variability and its wide distribution and longevity (∼ 800 years), allow us to consider this species as a good candidate for temperature reconstructions in the Mediterranean Basin.