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Silva Fennica 1926-1997
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Acta Forestalia Fennica
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Acta Forestalia Fennica vol. 34 no. 38 | 1929

Category: Article

article id 7251, category Article
Lauri Ilvessalo. (1929). Puuluokitus ja harvennusasteikko. Acta Forestalia Fennica vol. 34 no. 38 article id 7251. https://doi.org/10.14214/aff.7251
English title: Utilization of tree classification in thinnings.
English keywords: crown class; thinning method

Doctor Lauri Ilvessalo modified tree classification developed by professor Gunnar Schotte to develop a tree classification and thinning system that suited Finnish conditions. His system was first applied when the Finnish Forest Research Institute began thinning experiments in a large scale in 1924. The system distinguishes four crown storeys: the predominating crown storey, dominated crown storey, emergent trees and undergrowth. Into the predominating storeys belong dominant trees and co-dominant trees, and into the dominated storeys the intermediate and ground trees. The trees in all the storeys can be divided in to normal trees with well-formed crown and stem, trees with defectively developed crown, trees with defective stem, and injured and diseased trees. The article describes different thinning methods (cleaning thinning, selective thinning from below, selective thinning from above, increment felling, freeing felling) using the tree-classification.

The volume 34 of Acta Forestalia Fennica is a jubileum publication of professor Aimo Kaarlo Cajander. The PDF includes a summary in English.

  • Ilvessalo, ORCID ID:E-mail:

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