Why are oaks and beeches common in temperate deciduous forests?

Oaks and beeches are common in temperate deciduous forests because they are well-adapted to the specific environmental conditions and soil types found within these biomes.12

The dominance of these species is largely influenced by variations in soil fertility and composition:

• Soil Preferences: In regions such as northwestern Europe, the European beech (Fagus sylvatica) typically dominates on shallow soils overlying chalk, whereas oak (Quercus) species are more dominant on deeper, clay-rich soils.1
• Regeneration Strategies: Different species have evolved distinct ways to maintain their presence in the forest. For example, beeches are known to be shade-tolerant, allowing them to regenerate successfully beneath an existing, undamaged tree canopy.3
• Root Adaptations: The European beech utilizes a shallow lateral root system that forms a "root plate" just beneath the soil surface. This adaptation allows the tree to efficiently exploit nutrients released by decomposing litter at the surface while avoiding deeper soil layers that may become waterlogged.1

Ultimately, the specific composition of a forest is determined by a combination of these environmental factors, soil characteristics, and the history of natural or human-induced disturbances.13