Abstract
Quercus ilex is a tree that shows severe symptoms of oak decline. The mechanisms causing the decline of holm oak stands were studied on a network of eight observation plots installed in the Chettaba forest in Constantine’s southwestern area (Algeria). The methodology adopted was based on data collected in the field and analyzed statistically. The parameters studied were ecological (altitude, slope, and exposure), dendrometric, and sanitary (DEPEFEU protocol), in order to highlight potential interactions between these parameters. The results show that only 6.15% of trees have healthy crowns, 43.84% have moderately declining crowns, 31.15% have severely declining crowns, and 3.46% are moribund. Holm oak dieback is common at low altitudes, on steep slopes, and in east-facing exposures. Furthermore, there is probably no strong relationship between dendrometric parameters and dieback. The study of holm oak dieback in the Chettaba forest may contribute to the proposal of an appropriate management plan and the development of dynamic conservation strategies in relation to its present and future interests.