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Thinning of Scots pine and Norway spruce monocultures in Sweden

effects of different thinning programmes on standlevel gross- and net stem volume production

Nilsson, Urban and Agestam, Eric and Ekö, Per-Magnus and Elfving, Björn and Fahlvik, Nils and Johansson, Ulf and Karlsson, Kjell and Lundmark, Tomas and Wallentin, Christofer (2010). Thinning of Scots pine and Norway spruce monocultures in Sweden. Technical Report. Umeå: (S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management

(S) > Unit for Field-based Forest Research
(S) > Southern Swedish Forest Research Centre, Sveriges lantbruksuniversitet. Studia forestalia Suecica ; 219
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Abstract

The effect of thinning intensity, thinning interval, thinning form and timing of the first thinning on stand level gross- andnet stem volume production in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies L. Karst) was investigatedin a nationwide field experiment across Sweden. In total, 35 Scots pine sites distributed from the south to the north ofSweden and 13 Norway spruce sites located in the south and central parts of Sweden were investigated. Thinning treatments ranged from unthinned control, to light and moderate repeated thinnings, to a treatmentwhere 60-70% of the basal area was removed in a single thinning. In addition, thinning from above was compared tothinning from below and delayed first thinning was compared to early first thinning. The average measurement period was31 years for Scots pine and 30 years for Norway spruce. All Scots pine thinning treatments reduced the total gross stemvolume production compared to the unthinned control, whereas only the heaviest thinning treatments, in which a largeproportion of the basal area was removed, reduced the total gross stem volume production for Norway spruce. Thinningfrom above did not affect total gross stem volume production of Scots pine, but there was a tendency towards lowerproduction in Norway spruce. For Norway spruce, thinning from above resulted in lower net stem volume production thanthinning from below. Delaying the first thinning did not affect gross stem volume production for either Scots pine orNorway spruce. Net volume production and volume production in trees with diameter at breast height > 8 cm was higher forthe light thinning treatment than for the unthinned control in Norway spruce. In Scots pine, there was no differencebetween the light thinning treatment and unthinned control in net volume production. For cots pine, the heavy thinningtreatments decreased net volume production compared to the unthinned threatment whereas there were no differences innet volume production between the heavy thinning treatments and unthinned control in Norway spruce.

Authors/Creators:Nilsson, Urban and Agestam, Eric and Ekö, Per-Magnus and Elfving, Björn and Fahlvik, Nils and Johansson, Ulf and Karlsson, Kjell and Lundmark, Tomas and Wallentin, Christofer
Title:Thinning of Scots pine and Norway spruce monocultures in Sweden
Subtitle:effects of different thinning programmes on standlevel gross- and net stem volume production
Series/Journal:Studia forestalia Suecica (0039-3150)
Year of publishing :15 April 2010
Volume:219
Number:219
Page range:1-46
Number of Pages:46
Place of Publication:Umeå
Publisher:Fakulteten för skogsvetenskap, SLU
ISBN for printed version:978-91-86197-76-6
ISSN:0039-3150
Language:English
Publication Type:Report
Refereed:Yes
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry
Keywords:Pinus sylvestris L., Picea abies L. Karst, delayed first thinning, stem volume production, thinning grade, thinning form
URN:NBN:urn:nbn:se:slu:epsilon-2-409
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-2-409
ID Code:4655
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management

(S) > Unit for Field-based Forest Research
(S) > Southern Swedish Forest Research Centre
Deposited By: Hans Fryk
Deposited On:29 Apr 2010 00:00
Metadata Last Modified:02 Dec 2014 10:32

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