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Goia, Alexandru-Mihai, 2020. Effects of “classical” vs. “dynamic” silviculture of sessile oak-dominated stands in terms of height, diameter increments and natural mortality. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre

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Abstract

Traditional oak silviculture in Romania is associated with high labor costs and long rotation cycles which are imposed by current norms and regulations. A small-scale R&D project, consisting of a block with four plots of 200 m2, was established in 2001 in a 15-year old sessile oak-dominated stand. The stand was regenerated naturally through the application of group shelterwood cutting. In
each plot, ”potential” final crop trees were selected based on vigor-quality-distribution criteria and
marked with paint. Silvicultural interventions like cleaning-respacing and thinning of different intensities were performed in three plots (the fourth one was kept as control) in 2001, 2004 and 2009. The effect of stand density on diameter increment was more obvious when considering only the “potential” final crop trees than when all trees were considered. Their quadratic mean diameter (QMD) had reached values close to 20 cm at 35 (30-40) years in the plots with the lowest stand
density (STT) and about 15-16 cm for other plots. STT stand with the lowest stand density shows
low HDR values having slander trees. The mortality intensity between 2001 and 2019 was highest
in the control plot and lowest in STT. Sessile oak showed the highest mortality, followed by Hungarian oak and Turkey oak. In all plots, trees had reached heights corresponding to the hg of ca. 15 m, which is normal for a sessile oak stand of high productivity. The obtained results indicate the ”dynamic”, crop tree silviculture with the active selection of the most valuable individuals as ”potential” final crop trees at the end of thicket stage as being a possible solution for managing
sessile oak young and medium-aged stands. Nonetheless, these trees should be managed by subsequent crown thinning, in order to produce timber with as uniform as possible radial increments of 2-3 mm, as is requested by veneer and high-quality saw log buyers.

Main title:Effects of “classical” vs. “dynamic” silviculture of sessile oak-dominated stands in terms of height, diameter increments and natural mortality
Authors:Goia, Alexandru-Mihai
Supervisor:Skovsgaard, Jens Peter and Nicolescu, Valeriu-Norocel
Examiner:Nilsson, Urban
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2020
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:sessile oak, cleaning-respacing, thinning, stand silviculture, crop tree silviculture, mortality, growth, Romania
URN:NBN:urn:nbn:se:slu:epsilon-s-16369
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-16369
Subjects:Forestry production
Language:English
Deposited On:14 Jan 2021 11:17
Metadata Last Modified:15 Jan 2021 02:00

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