How does waterlogging affect trees and ground plants in temperate woodlands?

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temperate forest distribution — Temperate forest Worldwide distribution of temperate forests.

In temperate deciduous woodlands, waterlogging typically occurs during late winter and spring when high rainfall coincides with low evaporation rates and minimal transpiration from trees lacking foliage.1

The effects of waterlogging on the forest ecosystem include:

Tree Canopy: Waterlogged areas often support a less luxuriant tree canopy, as only a limited number of tree species possess the necessary tolerance for wet soil conditions.1
Root Adaptations: Many trees in these forests have evolved shallow root systems to exploit surface nutrients and avoid deeper, potentially waterlogged soil layers. For example, the European beech develops a shallow "root plate" just beneath the surface.1
Structural Stability: Trees with shallow root plates are more susceptible to being blown over during gales, particularly when heavy rainfall increases soil plasticity.1
Ground Flora: Despite the challenges posed to trees, areas subject to waterlogging often feature a richer variety of ground flora.1