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Stump heights and sprouting of European aspen, pubescent and silver birches, and damage to Norway spruce and Scots pine following mechanical and brush saw cleaning

Johansson, Tord (1992). Stump heights and sprouting of European aspen, pubescent and silver birches, and damage to Norway spruce and Scots pine following mechanical and brush saw cleaning. Technical Report. Uppsala: UNSPECIFIED, Sveriges lantbruksuniversitet. Studia forestalia Suecica ; 186
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Abstract

Results of precommercial thinning (cleaning) by brush saw and by a machine-mounted device, consisting of a hydraulically-driven heavy disc with two short steel flails mounted in a journal bearing, are presented. Plots were laid out in middle and south Sweden in 1983, some being observed annually until 1989. There were significant differences between the two methods as regards the number of sprouts on European aspen (Populus tremula L.) and birch (Betula pendula Roth and Betula pubescens Ehrh.) stumps six years after cleaning. Plots cleaned by machine had a larger number of birch or aspen sprouts, than plots cleaned by brush saw. Mean height of stumps was significantly greater on plots cleaned by machine. Stumps cleaned by machine under snow conditions were 30-70 cm high. There were no significant differences in the number of sprouts or in the height of sprouts, between high and low stumps. Cleaning by machine damaged 7-13 per cent of conifers classified as main stems, as compared to no damage caused by brush saw cleaning. Practical recommendations are given: cleaning by machine under a snow cover is not recommended in most cases.

Authors/Creators:Johansson, Tord
Title:Stump heights and sprouting of European aspen, pubescent and silver birches, and damage to Norway spruce and Scots pine following mechanical and brush saw cleaning
Series/Journal:Studia forestalia Suecica (0039-3150)
Year of publishing :1992
Number:186
Number of Pages:15
Place of Publication:Uppsala
Publisher:Faculty of Forestry, Swedish University of Agricultural Sciences
ISBN for printed version:91-576-4582-5
ISSN:0039-3150
Language:English
Publication Type:Report
Full Text Status:Public
Agris subject categories.:K Forestry > K70 Forest injuries and protection
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Betula pendula, Betula pubescens, Populus tremula, Pinus sylvestris, Picea abies, sprouts, stump height, growth, damage, mechanical cleaning, brush saw
URN:NBN:urn:nbn:se:slu:epsilon-8-270
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-270
ID Code:4065
Faculty:S - Faculty of Forest Sciences
Deposited By: Skogsbiblioteket Umeå
Deposited On:26 Oct 2009 00:00
Metadata Last Modified:16 Dec 2015 13:33

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