Abstract
ABSTRACT Cork growth rings from three sites in the North West of Algeria were analysed in relation to monthly and annual precipitation and to climatic indices. Ring width and their growth indices were small, ranging from 2.03 mm(ZA), 2.43 mm(TA) and 2.06 mm (AM), corresponding to a thin cork. Thirteen-year time series were compared to precipitation data from 2009 to 2021. Ring width and growth indices revealed a strong correlation with annual rainfall (December to January) and spring rains (May to June). Phellogen activity also remains markedly influenced by the maximum temperatures of March. In the context of global climate change, the water balance of the study area is inadequate. The severe drought in the region was manifested by positive correlations with the index of De Martonne. This also seems valid for the two drought indices (Gaussen index and xerothermic index). The extension of the dry season beyond 6 months affects cork oak activity.
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