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2 2024

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Floristic Diversity and Demographic Structure of Ouled Bechih Forest (Algeria)

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

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 1

73--81

In context of global change, biodiversity loss poses a serious problem in the Mediterranean basin. In Algeria, degradation problems (logging, deforestation, bush fires and agriculture) affect vegetation. Knowledge of vegetation characteristics is necessary to manage disturbed areas. That is why this study focused on demographic structure of main species of Ouled Bechih forest (Quercus canariensis and Quercus suber). On eight plots representing this forest of 900 m2 chosen at random, dendrometric and phytosociological parameters were collected. The results obtained reveal a total specific richness of 41 species. Principal families are Asteraceae (21.95%) and Fabaceae (7.32%). Average woody density is 154 individuals/ha with an average basal area of 27.33 m2/ha. Variance analysis shows that there is a high significant difference between the dendrometric parameters (p<0.001). Diameter and height structures are consistent with Weibull distribution. These structures indicate that trees are moderately stable with predominance of large diameter individuals. The results obtained will allow monitoring the vegetation dynamics and will help foresters to put in place a management plan to preserve this forest.

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.