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Regeneration and early management of birch and Norway spruce mixtures in Southern Sweden

Holmström, Emma (2015). Regeneration and early management of birch and Norway spruce mixtures in Southern Sweden. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:122
ISBN 978-91-576-8442-4
eISBN 978-91-576-8443-1
[Doctoral thesis]

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Abstract

Regeneration involving birch and Norway spruce is the most common mixture on clearcuts in southern Sweden. Sometimes the mixture is unintentional, and the naturally regenerated birch is often regarded as a weed-species in planted Norway spruce monocultures. In other cases, the additional seedlings from spontaneous natural regeneration are, perhaps, not planned for, but are still used, as a convenient way to create mixed forests with management for production and other services. The objectives of the research described in this thesis all refer to the establishment and early management of mixtures with planted Norway spruce and naturally regenerated birch. Hypotheses were tested in field experiments in the counties of Kronoberg and Halland. A better knowledge of seed supply, by estimating seed sources and seed dispersal, could be used when planning future stands and in the choice of management. The effect of soil scarification on seed emergence and seedling survival was tested in field experiments and modeled together with distance to seed supply. The combination of spatial information about standing volume and specific site variables produced birch regeneration estimates that could be useful for practical management and planning. Once the seedling population was established, after three to five years, the density, height structure and species composition were tested as variables for further selections in precommercial thinnings. The retained stems, 1000-3000 trees ha-1, responded positively to a reduction in competition even when stand heights were as low as 1-2 meters. The size of neighbors was more important than the species for the individual growth of both birch and Norway spruce. The competition release in the early stand is important if the target is to retain a mixed forest throughout the full stand rotation, otherwise the retained birches will have difficulty competing with the planted Norway spruce in later stages of the rotation. Other common broadleaved species and pine regenerate on the same clearcuts but the current browsing pressure from ungulates reduces the possibility to allow these species to be present in the future stand.

Authors/Creators:Holmström, Emma
Title:Regeneration and early management of birch and Norway spruce mixtures in Southern Sweden
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :13 November 2015
Depositing date:13 November 2015
Volume:2015:122
Number of Pages:55
Papers/manuscripts:
NumberReferences
IHolmström, E., Karlsson, M. & Nilsson, U. Modeling birch seed supply and seedling establishment during forest regeneration. (manuscript)
IIHolmström, E., Ekö, P.M., Hjelm, K., Karlsson, M. & Nilsson, U. Natural regeneration on planted clearcuts – the easy way to mixed forest? (manuscript)
IIIHolmström, E., Hjelm, K., Karlsson, M. & Nilsson, U. Multiple scenario analysis of precommercial thinnings in mixed stands. (manuscript)
IVHolmström, E., Hjelm, K., Johansson, U., Karlsson, M., Valkonen, S., & Nilsson, U. (2015). Pre-commercial thinning, birch admixture and sprout management in planted Norway spruce stands in South Sweden. Scandinavian Journal of Forest Research, DOI:10.1080/02827581.2015.1055792
Place of Publication:Alnarp
Publisher:Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8442-4
ISBN for electronic version:978-91-576-8443-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F40 Plant ecology
K Forestry > K10 Forestry production
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:natural regeneration, seed dispersal, soil scarification, thinning, mixed forests, betula, picea abies, sweden
Keywords:seed dispersal, natural regeneration, soil scarification, precommercial thinning, mixed forest
URN:NBN:urn:nbn:se:slu:epsilon-e-3073
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3073
ID Code:12829
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Emma Holmström
Deposited On:19 Nov 2015 08:15
Metadata Last Modified:15 Dec 2015 08:24

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