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Saicane, Dagnija, 2019. Thinning strategies of birch in Latvia, with application in a newly established field experiment. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre

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Abstract

Birch (Betula pendula Roth) is an early successional species which, if grown in suitable soils with wise management, can have high and valuable production. Large-dimension birch-wood is used for saw logs and plywood production, but smaller ones for pulpwood and energy wood.
During the last decades in Latvia, the area occupied by silver birch have been increasing. One of the reasons for that is that forest owners let clearcuts regenerate naturally, as a result, pioneer-species come first and another reason is abandoned agricultural land afforestation.
The purpose of this long-term experiment is to find suitable thinning intensity programs for birch stands with the aim to obtain veneer quality assortment in shorter rotation time. A second aim is to study if manual pruning can be an effective additional treatment to reach the aim of high-quality timber.
The experiment was implemented in south-east Latvia, in 14-years-old birch stands, which have been artificially regenerated by planting on former agriculture lands.
The chosen experimental design was randomized complete block (RCB) with split plots and 5 m wide buffer zone around. Each experiment consisted of six plots and six different thinning treatments that were randomly assigned to plots. The plots were split in half and in one half of the plots branches were pruned while trees were unpruned on the other half.
After first thinning quadratic mean diameter and quadratic mean height for remaining trees did not show statistically significant differences between treatments. However, basal area and volume differences between treatments were significant. Removed volumes varied considerably between various treatments; removed basal area and volume varied between 16% – 65% of initial basal area and volume dependent on treatment.

Main title:Thinning strategies of birch in Latvia, with application in a newly established field experiment
Authors:Saicane, Dagnija
Supervisor:Nilsson, Urban
Examiner:Ekö, Per-Magnus
Series:UNSPECIFIED
Volume/Sequential designation:320
Year of Publication:2019
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SM001 Euroforester - Master's Programme 120 HEC
Supervising department:(S) > Southern Swedish Forest Research Centre
Keywords:silver birch, abandoned agriculture land, thinning, pruning, design
URN:NBN:urn:nbn:se:slu:epsilon-s-10873
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-10873
Subjects:Forestry - General aspects
Language:English
Deposited On:16 Sep 2019 05:38
Metadata Last Modified:17 Sep 2019 10:08

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