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Regeneration methods and long-term production for Scots pine on medium fertile and fertile sites

Lula, Mikolaj (2022). Regeneration methods and long-term production for Scots pine on medium fertile and fertile sites. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-925-4
eISBN 978-91-7760-926-1
[Doctoral thesis]

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Tree species choice is a central issue for forest management, and survey studies show that urgent improvements in regeneration practices are needed in Sweden. Most Swedish forest is regenerated with Scots pine (Pinus sylvestris L.) or Norway spruce (Picea abies (L.) H. Karst). However, direct yield comparisons of the two species are rare. The first objective of this thesis was to compare productivity of Scots pine and Norway spruce stands across latitude and fertility gradients in Sweden. To do so, long-term field experiments were combined with modelling in Heureka. In contrast to general perceptions and a majority of previous findings, Scots pine was more productive not only on poor sites but also on medium-fertile to fertile sites (Paper I). The second objective of this thesis (Papers II-IV) was to investigate the potential for cultivating Scots pine on medium-fertile to fertile sites. Effects of planting, natural regeneration and direct seeding were compared in terms of short-term regeneration outcomes, long-term volume production and financial revenue. This was done using empirical field experiments and simulations in Heureka. Results indicated that Scots pine may be successfully regenerated even on medium- to fertile sites. However, regeneration via planting was more reliable than natural regeneration or direct seeding. Natural regeneration and direct seeding generally had less certain outcomes, mainly because key processes such as seed production and germination depend on weather conditions. Experimental results confirm earlier findings that mechanical site preparation (MSP) increases both survival and growth of planted seedlings. For natural regeneration and direct seeding, MSP improves seeds' germination and seedlings' survival and growth. For planted seedlings, reduced pine weevil damage probably helped increased survival whereas reduced competition from ground vegetation helped natural regeneration and direct seeding. Dense shelterwoods had slower seedling growth. However, inexpensive regeneration and income from shelter trees made profit from natural regeneration in shelterwoods only slightly lower than planting on clearcuts.

Authors/Creators:Lula, Mikolaj
Title:Regeneration methods and long-term production for Scots pine on medium fertile and fertile sites
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number of Pages:60
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-925-4
ISBN for electronic version:978-91-7760-926-1
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Pinus sylvestris, Picea abies, growth and yield, planting, natural regeneration, direct seeding, pine shelterwood, growth simulation, profitability of regeneration method
Permanent URL:
ID Code:27516
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: SLUpub Connector
Deposited On:07 Apr 2022 13:25
Metadata Last Modified:08 Apr 2022 13:18

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