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Aspects of precommercial thinning

private forest owners' attitudes and alternative practices

Fällman, Karin (2005). Aspects of precommercial thinning. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:90
ISBN 91-576-6989-9
[Doctoral thesis]

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Precommercial thinning (PCT) in young forests in Sweden has been an important part of the silvicultural system since the 1950s. However, the annual area treated with PCT has decreased since the 1990s. At the same time the relative cost of PCT compared to both harvesting and regeneration has increased. The objectives of the work underlying this thesis were to examine the attitudes to PCT among private forest owners, and to evaluate alternative and potentially more cost-effective methods for PCT. The private forest owners’ attitudes to PCT were assessed by a questionnaire, which showed that they were interested in their forest and wanted to perform PCT. However, it was often neglected or postponed, usually because lack of time and secondly the cost of the operation. The forest owners seem to have many objectives for their forestry in addition to financial considerations. There were also significant differences between male and female forest owners, for instance the female forest owners claimed to have less knowledge regarding forestry and PCT-issues than male forest owners. Several alternative PCT-methods were evaluated by field experiments, all with a randomised complete block design. One study focused on PCT through topping i.e. cutting the secondary stems at a higher level above ground than in traditional PCT, in a naturally regenerated birch (Betula)-dominated stand. Topping proved to be an attractive alternative, since the main stems in the topped treatments grew as well as the main stems on traditionally treated plots. Furthermore, it gave better results in terms of stem and branch properties. A point cleaning experiment (cutting competing trees within a certain radius of each main stem) in a planted Scots pine (Pinus sylvestris) stand showed that a single point cleaning operation gave worse results in terms of growth and stem quality variables, then a single traditional PCT. The findings are consistent with traditional recommendations to perform a subsequent PCT operation after point cleaning. The last study examined the effects of several variants of PCT, with differing tree selection criteria, in a typical planted Scots pine young stand in northern Sweden. The results showed that PCT was a profitable measure even if all planted stems were removed, raising the possibility that silvicultural cost-effectiveness could be optimised by retaining some of the natural regeneration and reducing the number of seedlings that are planted accordingly.

Authors/Creators:Fällman, Karin
Title:Aspects of precommercial thinning
Subtitle:private forest owners' attitudes and alternative practices
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :September 2005
Number of Pages:36
ALLI. Fällman, K., Albrektson, A. & Karlsson, A. 2005. Private forest owners in Sweden and their attitude towards precommercial thinning (Manuscript). II. Fällman, K., Ligné, D., Karlsson, A. & Albrektson, A. 2003. Stem quality and height development in a Betula dominated stand seven years after precommercial thinning at different stump heights. Scandinavian Journal of Forest Research 18: 145-154. III. Fällman. K., Albrektson, A. & Karlsson, A. 2005. Development of Pinus sylvestris main stems nineteen years after three different precommercial thinning methods in a mixed stand (Manuscript). IV. Fällman, K. & Nenzén, A. 2005. Efficiency of planting and precommercial thinning in a representative mixed stand of Scots pine, Norway spruce and birch in Northern Sweden (Manuscript).
Place of Publication:Umeå
ISBN for printed version:91-576-6989-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
Subjects:Not in use, please see Agris categories
Agrovoc terms:betula, pinus sylvestris, picea abies, slashing, cleaning, growth, private ownership, human behaviour, sweden
Keywords:Betula sp., cleaning, growth, growth simulation, Pinus sylvestris, Picea abies, stem quality, young stand
Permanent URL:
ID Code:912
Department:(S) > Institutionen för skogsskötsel
Deposited By: Karin Fällman
Deposited On:01 Sep 2005 00:00
Metadata Last Modified:02 Dec 2014 10:08

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