Marcin Jakubowski

Marcin Jakubowski
Poznań University of Life Sciences · Department of Forest Utilization

PhD

About

67
Publications
15,537
Reads
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231
Citations
Citations since 2017
13 Research Items
131 Citations
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2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
Introduction
wood properties, timer quality, wood anatomy, wood image analysis, tree architecture and non-wood forest products, dendroclimatology
Additional affiliations
October 2013 - September 2017
Poznań University of Life Sciences
Position
  • Head of Department
August 2010 - present
Poznań University of Life Sciences
Position
  • Professor (Associate)

Publications

Publications (67)
Article
Full-text available
W pracy przedstawiono przegląd literatury dotyczącej przemysłowego wykorzystania rodzaju paulownia. Celem pracy było zweryfikowanie aktualnego stanu wiedzy na temat wykorzystania drewna paulowni oraz możliwości uprawy przemysłowych odmian paulowni. W pracy opisano botaniczną przynależność, krótki rys historyczny, wymagania klimatyczne, zastosowanie...
Article
Full-text available
This work presents the results of selected wood properties in birch trees grown on a provenance experiment plot established as a seed orchard. The study concerned: basic density, oven-dry density and compression strength along the grain at a moisture content of 0% and at moisture content above fiber saturation point. Analyses were performed on 971...
Article
Full-text available
The allocation of wood density in trees depends on many factors, but mainly on the tree species. A great number of studies have analysed wood density in dominant or codominant trees, but only a few have focused on trees grown under canopy. We examined the basic wood density and fresh wood density of natural origin oaks growing under canopy of artif...
Article
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This review aimed to determine the current state of research on the growth conditions and use pertaining to paulownia wood, mainly in European countries where paulownia has been introduced only relatively recently. Several studies carried out on Paulownia hybrids have shown significant differences in the growth dynamics of individual clones in thei...
Article
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Our work focuses on the natural drying of woods in winter. It aimed to compare the natural drying process of three wood species: Scots pine as coniferous species, sessile oak as ring-porous species with a marked heartwood and silver birch as a sapwood species with a diffuse-porous structure. The research was carried out in central Poland. We collec...
Article
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This paper presents the basic assumptions and state of the research pertaining to the drying of wood in a forest. A clear distinction needs to be made between wood drying in the form of logs and whole trees that have been felled and left in a leafy state. The drying of whole trees has been known for many years as transpirational drying. This method...
Article
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The main purpose of his work was to examine a two type of wood density: basic density and green density. All the studies were carried out on a plantation grown in central Poland and damaged by tornado in summer 2017. For density tests a 36 broken plants were used. Results show a high value of green wood density (766 kg×m 3) and very low value of ba...
Article
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Tree biomechanics and biomechanical tree stability are research problems that have been discussed in world literature for many years. The biomechanical profile formation in trees is an extremely complicated problem and has not been fully clarified to date. It is influenced by many factors, which determine tree growth, tree development, multifunctio...
Article
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Seedlings growth of paulownia 'Shan Tong' in the Experimental Forest Station in Murowna Goślina in year 2017. Paulownia is a kind of broadleaved shrub and tree which is wide known by its rapid growth in various climatic conditions. Some clones of this plant have become popular in Poland in recent years. The aim of this research was to determine the...
Article
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Timber harvested from fresh-felled trees has high moisture content and relatively high mass. During storage, the timber dries out and its weight decreases with the loss of moisture. The main objective of this study was to determine how the method and conditions of short-storage in summer affect weight changes and moisture loss in beech timber (not...
Article
Full-text available
Introduction and Objectives Holding determined body postures during work is connected with muscles activity. The more forced the posture, the larger the number of muscles taking an active part in holding and stabilizing the work posture. During logging, the greatest share of awkward (forced) working postures occurs in tree felling by chainsaw. Mat...
Article
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Background. The presented study is focused on the analysis of the relationship between slenderness and selected biometric characteristics of Norway spruce (Pieca abies (L.) H. Karst) stand growing at the mixed fresh coniferous forest site. Material and methods. Data was collected on three plots established on the permanent experimental plot of the...
Article
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The aim of this work was analyse the variability in static modulus of rupture (MOR) and modulus of elasticity on static bending (MOE), in the trunks of pines. We put forward the hypothesis that the analysed properties will take higher values in the case of slender trunks, and additionally that the variation in the properties in slender trunks will...
Article
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The aim of this study was analyse the variability in basic density (Qbd) and compression strength parallel to grain of the wood in pine trunks (Rc). We put forward the hypothesis that the density and strength of the wood will be greater in more slender trunks, and that the variability in the properties in slender trunks will be smaller. The study w...
Article
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The study objectives included: i) determination of the mass and green density of pulpwood (wood+bark) and ii) comparison of the changes in these parameters during 14−day−long storage period. The experiment was conducted between 15 and 28 July 2014 and the material was taken from the 67 year−old Scots pine stand (Tuchola Forest District, northern Po...
Article
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The aim of this analysis was to determine the mass of pine pulpwood, harvested from fresh-cutting trees. Analyses were made in four pine stands (aged 45, 47, 55 and 56). In each plot a total of 30 model trees were selected from among trees to be felled as a part of planned intermediate cutting. The average mass of one log of 2.5 m length ranged fro...
Article
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An analysis of the quality and value of timber in pine tree stands representing selected ecotypes of this species in Poland This paper attempts to compare the value and quality of the Scots pine (Pinus sylvestris L.) represented by four of its ecotypes, i.e. Bolewice, Gubińska, Taborska and Supraska. The research was carried out on old pine tree st...
Article
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Changeability of tree tissue properties of the Scots pine (Pinus sylvestris L.) as a marker of trees' ageing This paper attempts to delineate the effects of the ageing process of trees on the quality of the tree's tissue circumscribed by its properties, i.e. basic density (Qu) as well as the static bending strength of absolutely dry wood and of max...
Article
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The effect of tree senescence on wood tissue characteristics in Scots pine (Pinus sylvestris L.). It was investigated how the process of tree ageing affects characteristics of the wood tissue, defined on the basis of variation in the width of annual growth rings. Three stands were chosen for the study, aged between 155 and 166 years, from which a t...
Article
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The effect of tree senescence on selected properties of wood tissue in Scots pine (Pinus sylvestris L.). It was investigated how the process of tree ageing affects the quality of the wood tissue, defined in terms of two properties: the basic density (Qu)and the modulus of elasticity in static bending (MOE). Three stands were chosen for the study, a...
Article
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Morphological architecture of different ecotypes of Scots pine (Pinus sylvestris L.) in Poland. In this paper, we attempted to accurately describe and compare the morphological architecture of Scots pine (Pinus sylvestris L.), representing three different ecotypes from Bolewice, Gubin, and Tabórz. The samples come from old pine stands aged from 104...
Article
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Weight and green density of oak pulpwood harvested from the selected stands of Łąck Forest Inspectorate. The paper presents the results of a pilot study the aim of which was to define the actual weight of oak pulpwood. The average weight of a single log with bark is 23,3 kg (0,025 m 3). By dividing the total weight of the green wood material in bar...
Article
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Weight and green density of birch pulpwoodharvested from the selected stands of Kaczory Forest Inspectorate. The paper presents the results of a pilot study which was organized in the Kaczory Forest Inspectorate area. The aim of the study was to define the actual weight and green density of birch pulpwood. According to the applied methodology, the...
Article
Full-text available
Research was carried out in Scots pine (Pinus sylvestris L.) stands damaged by strong wind in six locations in Poland. The aim of this study was to analyse the radial variation of compressive strength parallel to grain in the wind−broken trees and neighbouring survivors. Strength tests were conducted in moisture above saturation fibre point. There...
Article
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The paper presents a comparison of the density of seven provenances of spruce trees, grown on an experimental plot located at Siemianice Forest Experimental Station. This plot is a unique research area on which observations concerning the growth of spruce trees of different provenances have been conducted for 41 years. The conditions in which the t...
Article
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This study verify the accuracy of 16 algorithms available in the ImageJ and using for determination of latewood zone. For purposes of the work 50 wood samples (20 mm x 20 mm x 30 mm) were collected from 10 Scots pine trees (54 year old). Samples were taken from a height of 1.3 m. Cross section of wood were polished and scanning. Images of wood samp...
Article
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The aim of the study was to determine the effect of selected tree stability indices described by individual biometric characteristics on the formation of their wind resistance. The analysis of tree stability was based on easily measurable tree traits, such as height, breast height diameter, crown parameters as well as the centre of gravity and slen...
Article
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We assumed that wood of trees undamaged by wind will be characterized by higher basic density than wood of damaged specimens. It was stated that wood of windthrow had lower basic density, but differences were not statistically significant. Two parts of wood: compressed and tensioned zones) were analyzed separately. Higher density was found in tensi...
Article
Full-text available
The aim of the survey was to examine the relative density of Norway spruce (Picea abies L.Karst) wood obtained from a seed orchard. The survey relied on material from planned felling on plantation no. 52 in the Susz forest division (the Olsztyn Regional directorate of State-Owned forests) established in1988. Under scrutiny were samples collected fr...
Article
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The paper presents a review of studies on the structure and properties of wood in relation to loads and damage of trees caused by wind. These two are the characteristics commonly used in the analyses of relationships between the tree and conditions of its growth and development.
Article
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Compression strength along the grain in twin samples (wet and absolutely dry) coming from wood of wind-broken trees of Scots pine (Pinus sylvestris L.). Analyses were conducted on two experimental stands damaged by strong wind I north part of Poland. This paper is a part of a cycle of research conducted in pine stands, which suffered from windfall...
Article
Full-text available
The paper analyzes pure density of wood in wind-broken trees and standing trees (control) coming from two stands damaged by strong wind (the Świdwin and Kolbudy forest districts). Generally a higher wood density was found for the control trees. The difference was 2 kg/m3 and it was not significant statistically. A similar result was recorded for th...
Article
Full-text available
The study analysed values of modulus of elasticity at static bending in the tangential direction for wood of wind-broken trees and standing trees (control) coming from two stands damaged by strong wind (the Świdwin and Kolbudy Forest Divisions). Analyses were conducted at moisture content above fiber saturation point (wet samples) and at zero moist...
Article
Full-text available
Modulus of Rupture in twin samples (wet and absolutely dry) coming from wood of wind-broken trees of Scots pine (Pinus sylvestris L.). Analyses were conducted on two experimental stands damaged by strong wind I north part of Poland. The aim of this study was to determine whether static bending strength of broken and undamaged trees differ from one...
Article
Full-text available
The paper presents an attempt to determine conducting area (CA), relative conducting area (CA.k-1) and mean ring conducting area (CAar) on discs cut at breast height from stems of larch trees growing in fresh mixed coniferous forest and fresh mixed forest sites, representing four age classes and the main crop according to Kraft's classification. Th...
Article
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In the study attempts have been made to compare the conducting area (Pp) values in European larch (Larix decidua Mill.) having different biosocial positions in the stands Of Younger age classes. The Pp value increases with age and transfer of trees to a higher biosocial class in a stand. Also, the Pps index describing average earlywood conducting a...
Article
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This paper presents an analysis of policy application in Poland affecting landscape and forest management changes designed for an ecological restoration. “Ecological” policy was introduced in Poland in 1991 (Bill on Forests) and 1995-1999 (Decree 11 and 11A). To analyse the effectiveness of the policy and its impact on landscape change, the study u...
Poster
Full-text available
This study is carry out on broken stems of Scots pine, growth in different stands 3 rd and 4 th age classes, and come from a one big complex of forests (Bory Tucholskie). Test trees have been fell, measured and described. The fracture was analyzed in details and a part of stem 3 meters below and above the fracture.
Article
Full-text available
In their study, the authors made an attempt to determine the radial variability of the strength quality coefficient of Scots pine (Pinus sylvestris L.) wood in relation to the biosocial position of trees in the stand. The performed investigations comprised trees representing the first three Kraft classes from the pine stands of the age classes V a...
Article
Full-text available
The study presents results of investigations in which attempts were made to determine and compare the conventional density and compression strength along wood fibres of Scots pine (Pinus sylvestris L.) developed on former farmland and on typical forest soils. The analyses comprised two forest site types: fresh coniferous forest (FCF) and fresh mixe...

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Projects (2)
Project
A network initiative to link ring-width measurements with satellite-borne earth observations. The TREOS initiative aims to establish a new tree ring research network to explore the possibilities of interpolating tree growth at mesic sites in Central Europe using the latest high-resolution satellite data. In recent decades, satellite imagery has developed rapidly and now provides open access to time series with high temporal and spatial resolution. Earth observations by satellites (EOS) can be related to radial growth of trees if field calibration is performed, which could then support upscaling of tree growth from individual trees to site and landscape levels. Statistical relationships between EOS and tree rings are commonly studied in alpine and boreal forests, where individual growth factors often determine growth. However, at mesic sites in temperate climates, tree growth is limited by multiple factors, and the relationship between EOS and tree growth remains challenging. We hypothesize that at mesic sites, additional site descriptors such as elevation, slope, and forest characteristics play an important role in explaining tree growth. In addition, the application of machine learning algorithms and the use of higher resolution satellite data could increase the predictive accuracy of already established models. However, to train appropriate algorithms, regional to continental tree ring networks covering recent years are needed to allow for a sufficiently large sample size over the entire observation period of the main satellite missions, such as Landsat 8 (since 2013) and Sentinel 2 (since 2015). We therefore invite researchers to participate in our TREOS initiative by sampling and/or providing tree ring data from Central Europe and altitudes below 1200 m that have been collected in October 2018 or a more recent period. Based on the network, we aim to improve our understanding of the robustness and uncertainty of the link between EOS and secondary tree growth of conifers and broadleaves, and to generate appropriate transfer functions.
Project
Keywords: tree architecture, wood properties, wood anatomy, adaptation, extreme factors, wind load, hardwood, sapwood, plantations Deadline: 15 July 2022