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The main objective of this study was to investigate the effect of shading and water availability on tree seedling growth of cork oak (Quercus suber L.) and zeen oak (Quercus canariensis Willd). To reach this objective, two light intensities (moderate (L+) versus low (L-) intensity) and two water regimes (well-watered (W+) versus moderate drought (W-)) were applied. Cork oak seedlings growing under well-watered conditions were able to increase their height in response to low light intensity, while those growing under water deficit were not. By contrast, zeen oak’s response to light was independent of water regime with greater height under Lthan under L+. Diameter growth was lower under Lthan under L+ for cork oak, and similar under both light intensities for zeen oak. Balance between height and diameter was adversely affected under Lfor both oaks, while that between shoot and root biomass was adversely affected only for cork oak, compared to L+. The effect of water stress resulted in a reduction in diameter growth, root biomass, and total biomass and an increase in shoot-to-root ratio for zeen oak. Our results suggest that low water availability may be the bottleneck for recruitment of cork oak seedlings in shaded habitats.

Impact of moderate drought and shading on morphological traits of Quercus suber L. and Quercus canariensis Willd seedlings