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Influence of thickness on bendability of aspen wood

100%

Gaborik J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

|

tom 88

Influence of thickness on the bendability of aspen wood. Aspen is a little industrial exploitation of wood. For its application in the manufacture of molded furniture, it is necessary to know its bendability. In this work we focused on the influence of the thickness on the bendability of aspen wood. Bendability varies depending on the thickness.

2

Laboratory investigations on the durability of aspen [Populus tremula L.] wood on the fungi action

86%

Lutomski K.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

1995

|

tom 26

85-92

3

Porosty topoli osiki [Populus tremula L.] w Biebrzanskim Parku Narodowym i jego okolicach

86%

Kolanko K.

Parki Narodowe i Rezerwaty Przyrody

|

2003

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tom 22

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nr 3

347-357

4

Investigations on impregnation ability of european aspen [Populus tremula L.] wood

72%

Lutomski K., Cofta G., Mazela B., Remi R.

Folia Forestalia Polonica. Series B - Drzewnictwo

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1997

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tom 28

73-84

5

PTT - biotechnologiczna hybryda topoli i osiki

72%

Ochmanska M.

Informacyjny Biuletyn Rolniczy. Aktualności

|

1994

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nr 47

20

6

Growth of Populus tremula on CO2-enriched soil at a natural mofette site

72%

Vejpustkova M., Thomalla A., Cihak T., Lomsky B., Pfanz H.

Dendrobiology

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2016

|

tom 75

The main objective of the study was to evaluate inter-annual ring-width variation and cumulative growth of aspen (Populus tremula L.) trees growing on the spots of different soil CO2 concentration at natural mofette site. We hypothesized that growth rate of trees is affected by CO2 concentration within their rooting zone. The study site was situated in the flood plain of Plesná stream near Hartoušov (Western Bohemia). Trees growing in a pure aspen stand were selected according to the CO2-gas regime within their rooting zone. Five high [CO2] trees (10–25% CO2 in the soil) and five low [CO2] trees (up to 3% CO2 in the soil) were sampled. Stem growth analysis of each trunk was carried out to study growth pattern in detail. High and low [CO2] trees significantly differed in a growth rate. At the age of 25 years, the basal area of high [CO2] trees exceeded low [CO2] trees by 39 %. The positive effect of CO2 on annual increment was pronounced particularly in the years with optimal growing conditions. Results suggest that trees can be fertilized not only by elevated atmospheric CO2 but also when fed with CO2 via the roots.

7

Wykorzystanie osiki Populus tremula przez ptaki w pierwotnych drzewostanach Bialowieskiego Parku Narodowego

72%

Walankiewicz W., Czeszczewik D.

Notatki Ornitologiczne

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2005

|

tom 46

|

nr 1

9-14

8

Mikrorozmnazanie osiki Populus tremula i klonow Populus tremula x Populus tremuloides

72%

Wesoly W., Lassocinski W., Kozlowski G.

Prace Komisji Nauk Rolniczych i Komisji Nauk Leśnych. Poznańskie Towarzystwo Przyjaciół Nauk

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1996

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tom 82

157-164

9

Effect of aluminium on the development of poplar [Populus tremula L. x P.alba L.] in vitro and in vivo

72%

Bojarczuk K.

Polish Journal of Environmental Studies

|

2004

|

tom 13

|

nr 3

Adventitious bud cultures were established by using buds of selected poplar clones (Populus tremula L. × P. alba L.) as initial explants. The Murashige and Skoog medium (1/2 and 1/4 MS) was used for multiplication and rooting of shoots. To the media, aluminium was added in the form of sulphate, at a concentration 50−70 mg Al dm-3. The culture was continued in vitro for more than 12 months. The cultures developed on media with aluminium (Al+) were more tolerant to aluminium in the medium during multiplication than those developed on media without aluminium (Al−). Rooted poplar cuttings obtained from cultures on media with aluminium (Al+) grew better in soil from an area polluted by a phosphate fertilizer factory (Luboń) than those from media without aluminium (Al−). This soil was characterized by a high Al level, low Ca/Al ratio and low pH, as compared to the control soil, from an area regarded as free from toxic pollution.

10

Effect of structure of laminated wood on bending strength after cyclic loading

58%

Gaborik J., Fekiac J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2019

|

tom 105

11

Renaturyzacja flory porostow w obwodzie ochronnym 'Moczarne', w obszarze ochrony scislej Bieszczadzkiego Parku Narodowego

58%

Kiszka J.

Roczniki Bieszczadzkie

|

2000

|

tom 09

19-26

12

Nasze topole i ich znaczenie

58%

Karczmarczuk R.

Aura

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2000

|

nr 11

24-26

13

Zbiorowisko z Betula pendula i Populus tremula w zadrzewieniach śródpolnych zachodniej części Pojezierza Drawskiego

58%

Mlynkowiak E., Kutyna I.

Folia Pomeranae Universitatis Technologiae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica

|

2009

|

tom 10

14

Seed vigor, photosynthesis and early growth of saplings of different triploid Betula families

58%

Mu H., Jiang J., Li H., Liu G.

Dendrobiology

|

2012

|

tom 68

Breeding scientists have given extensive attention to triploids in trees because of their importance to forestry. Consequently, creating and breeding triploids of good quality has become one of purposes of tree breeding. We chose two autotetraploids (Betula platyphylla, named Q10 and Q65) as female parents and eight hybrid diploids (B. platyphylla × B. pendula, named F1 – F8) as male parents to obtain progenies through controllable pollination, resulting in triploid progenies. Germination rate and germination energy of triploid seeds of Q65 were significantly higher (P < 0.01) than in triploid seed s of Q10. Triploid families with Q65 as female parent had a large quantity of saplings, whereas triploid families with Q10 as female parent had a small quantity of saplings. Triploid families with Q65 as female parent were generally superior in base diameter and height to base diameter ratio when compared to a diploid family. Q65×F3 was preliminarily recognized as the superior family. These results demonstrate that the female parent has a major influence on triploid progenies, although the male parent also has a small influence. The results provided a reference to build seed orchards of triploid birch trees, choose tetraploids as female parents and forecast triploid families of good quality.

15

Udział pionierskich gatunków drzew w stuletnim pozrębowym drzewostanie grądowym w Białowieskim Parku Narodowym

58%

Szymura M., Walankiewicz W.

Parki Narodowe i Rezerwaty Przyrody

|

2016

|

tom 35

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nr 1

16

Wzory do okreslania miazszosci grubizny dla modrzewia, osiki, grabu, topoli i lipy

58%

Wroblewski L., Zasada M.

Sylwan

|

2001

|

tom 145

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nr 11

71-79

17

Odnowienie naturalne na powierzchniach uszkodzonych przez pozar w Nadlesnictwie Rudy Raciborskie

58%

Dobrowolska D.

Leśne Prace Badawcze

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2008

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tom 69

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nr 3

255-264

18

Assessment of air pollutants in an urban agglomeration in Poland made by the biomonitoring of trees

58%

Chwil S., Kozlowska-Strawska J., Tkaczyk P., Chwil P., Matraszek R.

Journal of Elementology

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2015

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tom 20

|

nr 4

In 1970-2000, the state of the natural environment in many regions of Poland was unsatisfactory. This situation has been improving since the integration with the European Union, mainly owing to the reduction of emissions of sulphur and nitrogen oxides. The present study included three tree species: rowan (Sorbus aucuparia L. em. Hedl.), small-leaved lime (Tilia cordata Mill.), and aspen (Populus tremula L.). The trees grew in a pollution free environment (Huszlew) and in an urban agglomeration (Lublin). The aim of this research was to make comparative observations of the structure of leaves in relation to the content of lead, zinc, copper, nitrogen and sulphur determined in these organs. The N/S ratio in the leaves was accepted as an indicator of proper metabolic processes. Observations of leaves were made with using light microscopy and the scanning electron microscopy (SEM) technique. The content of heavy metals in leaves was determined by atomic absorption spectrometry (AAS) after dry mineralization. Total sulphur was determined by the turbidimetric method, while nitrogen by the Kjeldahl method after mineralization in sulphuric acid. When influenced by polluted air, the epidermis of the examined leaves was composed of smaller cells with higher stomatal density per unit area and had a lower number of open pores compared to the epidermis of the leaves developed in a clean environment. Among the species investigated, aspen was characterized by the highest ability to bioaccumulate heavy metals in its leaves. Among the elements determined only the Zn content exceeded the permissible limit, whereas Pb and Cu were found to occur in the range of values considered to be optimal. The dominant share of lead in suspended dust caused changes in the epidermis of leaves, which led to disorders in plant water relations.

19

Spontaneous regeneration of the Carpathian beech forest in planted pine stands of the Roztocze National Park (the Roztocze Highlands, South-East Poland)

58%

Maciejewski Z.

Polish Journal of Ecology

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2011

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tom 59

|

nr 2

Directions and the scope of changes in the species composition of individual layers in secondary pine communities belonging to the class Querco-Fagetea Br.-Bl. & Vlieg. 1937 (tree stand, shrubs and vascular plants of the herb layer) observed at two study plots over almost 40 years (from 1971 until 2009) are discussed. Both tree stands were planted and they are in the phase of spontaneous regeneration towards a potential natural community – the Carpathian beech forest Dentario glandulosae-Fagetum Oberd. 1953. Species with greater light requirements (pine Pinus sylvestris L., aspen Populus tremula L., oak Quercus robur L., ecologically alien to the potential plant community, retreat from the tree and shrub layers. The share of tree species typical of the potential community (beech Fagus sylvatica L., hornbeam Carpinus betulus L., sycamore Acer pseudoplatanus L.) – in the tree stands increases. The rate of changes is particularly high for beech, while regression symptoms are noticed for fir Abies alba Mill.: a decrease in the abundance and share of fir in both tree-stands was recorded. A decrease in the abundance and frequency of the majority of species, including species characteristic of deciduous forests (class Querco-Fagetea) and beech forests (order Fagetalia sylvaticae Pawł.1928), and an increase in species typical of alder-ash riparian forests (alliance Alno-Ulmion Br.-Bl. & Tx. 1943) and nitrophilous communities were observed in the herb layer. Conversion treatment may reinforce the artificial character of the community because the species composition, as well as the spatial and age structure of the tree stands, can be arbitrary and therefore artificially formed during conversion (arbitrary applied size and order of regeneration clumps and areas). When anthropogenic communities are left undisturbed, processes affecting all phytocoenotic layers are activated and spontaneous forest regeneration usually begins. Therefore, tree-stand conversion used as a tool to restore natural community is not effective.

20

Grzyby endofityczne a choroby zgorzelowe drzew w warunkach oddzialywania imisji przemyslowych

58%

Kowalski T.

Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa

|

1999

|

tom 63

83-99

Ograniczanie wyników

Influence of thickness on bendability of aspen wood

Laboratory investigations on the durability of aspen [Populus tremula L.] wood on the fungi action

Porosty topoli osiki [Populus tremula L.] w Biebrzanskim Parku Narodowym i jego okolicach

Investigations on impregnation ability of european aspen [Populus tremula L.] wood