Pro Silva Ireland
WHAT IS CCF transformation?
Transformation in CCF is the gradual process of converting an existing even-aged plantation, composed of a single species or a limited species mix, into a structurally diverse, mixed forest.
It is a gradual process guided by selective felling.
Selective felling is a management technique used to shape the stand and achieve CCF management objectives. Trees carefully selected for removal release remaining trees from competition, improving the quality of timber in the stand, encouraging natural regeneration, and maintaining and supporting a healthy forest ecosystem. Through this process, the forest gradually moves toward a fully irregular structure.
Early felling interventions typically take the form of a thinning, progressing over time to include the selective harvest of higher-value sawlog trees within the ongoing felling cycle.
The time required to transform a plantation into a CCF forest depends on the condition and composition of the stand at the outset. Some sites respond relatively quickly to selective felling interventions, with the development of well-formed canopy crowns and the presence of early natural regeneration.
Other plantations are a longer-term prospect, requiring light, regular thinning interventions to enhance stability throughout the transformation process. Where suitable seed sources are absent, enrichment planting may be necessary to introduce desired species.
Example
In Ireland, some of the earliest sites to begin transformation—mixed conifer stands managed under CCF for around 25 years—have now reached late-stage transformation. These forests display a multitiered canopy with large, high-quality conifers, quality pole stage trees of the original stocking species, and a developing understorey of regenerated conifers and native woodland species.
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