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Research article - Peer-reviewed, 2021

Management of spontaneously regenerated mixed stands of birch and Norway spruce in Sweden

Lidman, Felicia Dahlgren; Holmstrom, Emma; Lundmark, Tomas; Fahlvik, Nils

Abstract

Timber production and profitability were evaluated for spontaneously-regenerated mixtures on two formerly clearcut areas. The abandoned areas developed into birch-dominated (Betula pendula Roth and Betula pubescens Ehrh.) stands with successional ingrowth of Norway spruce (Picea abies (L.) H. Karst.). An experiment with randomized treatments within blocks was established, using three management strategies and one unthinned control, resulting in variation in optimal rotation age, merchantable volume and species composition. The management strategies were evaluated based on total production (volume) by using measured growth data 42 years after clearcutting and the modelled future stand development. The long-term effects of spontaneous regeneration and management strategies were evaluated based on land expectation value (LEV) and compared with a fifth management strategy using artificial regeneration and intense thinnings. 12 years after treatment, at a stand age of 42 years, the unthinned control had produced the highest total stem volume. At interest rates of 2% or higher, the unmanaged forest was an economically viable strategy, even compared to an intensive management strategy with a preferred merchant-able timber species. Interest rates clearly impacted the profitability of the different management strategies. This study shows that when spontaneous regeneration is successful and dense, the first competition release can have a high impact on the development of future crop trees and on the species mixture.

Keywords

Betula pendula; Betula pubescens; Picea abies; land expectation value; mixed forest; natural regeneration

Published in

Silva Fennica
2021, volume: 55, number: 4, article number: 10485
Publisher: FINNISH SOC FOREST SCIENCE-NATURAL RESOURCES INST FINLAND

Authors' information

Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Fahlvik, Nils
Skogforsk

UKÄ Subject classification

Forest Science

Publication Identifiers

DOI: https://doi.org/10.14214/sf.10485

URI (permanent link to this page)

https://res.slu.se/id/publ/114139