Long-term effects of clipping on production and vigor of kermes oak (Quercus coccifera)

The effect of clipping on the production and vigor of kermes oak (Quercus coccifera L.) was studied for five growing seasons. Five clipping intensities, 20, 40, 60, 80 and 100% of current-growth twig length, were applied every 15 days. Clipping at 60 and 80% resulted in greater twig numbers and higher usable forage, although twig biomass and acorn production were less, than for clipping at 20 and 40%, and in the control. Vigor of plants clipped at 80% was slightly reduced compared to lighter intensities and the control. Plants subjected to 100% clipping died during the 4th year of treatment. It is concluded that kermes oak can withstand heavy grazing up to 80% for a period of 5 years with no detrimental effects on its vigor.