Wyniki wyszukiwania - Biblioteka Nauki

1

Bartek dębem Europy

100%

Siewniak M. , Styczyński S.

Zieleń Miejska

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2009

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tom Nr 1

30-32

PL

Dąb Bartek, najbardziej znane drzewo w Polsce, należy do nielicznej grupy sędziwych okazów, które znane są również w całej Europie. Jego imponujące rozmiary oraz długoletnia historia sprawiają, że ma on wyjątkowe znaczenie, a jego walory przewyższają rangę ustawowego statusu pomnika przyrody.

2

Rodzime osobliwości Dębowe sacrum

100%

Tomczak P.

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tom Nr 3

36-37

PL

Dzieki malowniczej sylwetce, imponujacym rozmairom oraz niepowtarzalnej architekturze, od niepamiętnych czasów dąb uznawany był za drzewo święte.

3

Weteran Bartek

100%

Siewniak M.

Zieleń Miejska

|

2012

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tom Nr 1

35-37

PL

Drzewo jest w tradycji i kulturze wyjątkowym organizmem i symbolem. Rośliny te są nie tylko największymi spośród żywych, ale także jednymi z najstarszych na Ziemi. Są one niejako predysponowane do roli pomników przyrody, które obok przyrodniczych niosą wartości historyczne i kulturowe.

4

Climate influence on radial increment of oak (Quercus sp.) in central Poland

100%

Bronisz A. , Bijak S. , Bronisz K. , Zasada M.

Geochronometria

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2012

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tom Vol. 39, no. 4

276-284

EN

The study investigates the influence of climate conditions on radial increment of oak, with special concern to the situations when analysed trees formed conspicuously wider or narrower tree-rings. The research material was collected in four locations in central Poland within natural range of pedunculate and sessile oaks. The elaborated residual chronologies were correlated with CRUTS 2.1 climate data. The analyses included thermal and pluvial conditions spanning from April of the year prior to ring formation to September of the current growth year. Special interest was paid to simple water ability index that combined both temperature and precipitation during the vegetation season. Additionally, pointer year analysis was carried out to determine situations when conspicuously small-er or larger increment was formed. Investigated chronologies cover the period of 1927-1992 (Łochów), 1845-1992 (Płońsk), 1868-1992 (Pułtusk), and 1796-1992 (Sokołów). The analysed oaks from sites in central Poland exhibit growth patterns comparable with those known form previous studies concerning that species, where influence of precipitation (higher and positive) and temperature (negative) have been observed. Extreme growth reactions expressed by negative and positive pointer years turned to present high dependence of ana-lysed oak’ growth on water availability during vegetation season.

5

Untersuchungen uber den Einfluss der Kaffeebraune von Eichenholz auf die Qualitat des Holzrohstoffes

100%

Paschalis P. , Lotocka Z.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

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1992

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tom 43

6

Dendrochronological and radiocarbon dating of subfossil wood from the Morava River basin

88%

Kolář T. , Rybníček M.

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tom Vol. 38, no. 2

155-161

EN

The paper deals with dendrochronological and radiocarbon dating of subfossil trunks found in the basin of the Morava River. The research into subfossil trunks had been conducted in the Czech Republic in the past but the research stopped in 2001. 160 records of measurements of subfossil, predominantly oak trunk samples, are preserved from that time. Three years ago the research was reo-pened and again the most trunks were found in the basin of the Morava River. 92 samples of oak trunks and 7 samples of other tree species (poplar, elm, maple, beech) were taken from selected sites. The samples were processed in compliance with the standard dendrochronological methodology. To date the samples, Czech, Austrian, Polish and German standard chronologies were used. In cases when the dendrochronological dating was unsuccessful, the samples were sent for radiocarbon dating. In total, 35 samples were dated, mainly by the radiocarbon method. Subfossil trunks from gravel pit Tovačov were dated and classified into 4 different periods, the oldest being from 2780-2190 BC. In Osek nad Bečvou, the samples were taken from two sites. Whereas from the 4 trunks taken in the riv-er channel each was from a different period, the trunks from the gravel pit come from 981-1015 AD. The trunks found in the Morava River basin near Strážnice were dated to the 10th-15th century. In the future, we expect to extend the amount of the acquired samples with the aim to create a link to the existing standard chronology or to create a long floating average tree-ring curve.

7

The benefits of tree-ring curves detrending for dating archaeological wood

88%

Rybníček M. , Koňas P. , Kolář T.

Geochronometria

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2010

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tom Vol. 35

85-90

EN

During the process of developing the standard chronology for oak for the Czech Republic, two versions of standard chronology were determined: the standard chronology developed using detrended tree-ring series and the standard chronology developed using non-detrended tree-ring series. These standard chronologies were applied to date detrended and non-detrended average tree-ring curves obtained from dendrochronological samples from selected archaeological locations. The highest values of the t-test were achieved when comparing the detrended or non-detrended average ring curves only and exclusively with the detrended standard chronology. Similarly, the highest percentage of the curve parallelism was always obtained in comparison with the detrended standard chronology. The confidence and, more importantly, the prediction intervals of the detrended ring curves are considerably smaller than those of the non-detrended ones. The regression curves of the detrended standardised values of the ring curves are more similar to the calibration curve than the non-detrended ones. The significance level of the regression models in the detrended ring curves is notably higher, than in the case of the non-detrended ring curves. The differences established between the detrended and non-detrended standard chronology have highlighted the importance to develop detrended standard chronologies.

8

Drzewa mniej znane. Dąb burgundzki

88%

Czekalski M.

Zieleń Miejska

|

2010

|

tom Nr 7-8

46-46

9

Dęby

75%

Mielicki K.

Zieleń Miejska

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2020

|

tom Nr 6

32--33

PL

Majestatyczne i dostojne, nieodłącznie wpisane w naszą kulturę i historię. Tak nam kojarzą się dęby [Quercus sp.]. Rzadko są uwzględniane w przestrzeni miasta. Szkoda, bo jest wiele innych cennych gatunków i odmian, które swą dostojną sylwetką i odpornością przemawiają, by stosować je jako reporezentacyjne drzewa miejskie.

10

Testing of the fatigue strength along wood fibres at different moisture contents

75%

Dobrowolska E. , Niedbała M. , Tabaczyński D.

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

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2021

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tom No. 115

45--54

EN

Testing of the fatigue strength along wood fibres at different moisture contents. The paper determines the effect of wood moisture content on the fatigue strength in compression along fibres. The method of determining the maximum stress at the proportional limit was used for the measurements. Fatigue strength was investigated for three wood species: pedunculate oak (Quercus robur L.), bearded birch (Betula pendula Roth.) and Norway spruce (Picea abies L.), with two moisture contents: close to the absolutely dry state and above the fibre saturation point. The ratio of fatigue strength to short term strength depends on moisture content and is similar for birch (70.3% in the dry state and 72.1% in the wet state), for oak (67.4% and 69.5% in both states) and for spruce (66.6% in the dry state and 68.1% in the wet state). The moisture content of the wood clearly influences the fatigue strength of the wood. On average, the fatigue strength of wood with moisture contents above the fibre saturation point constitutes about 0.20 of the fatigue strength of wood with moisture contents close to 0%. This tendency was found regardless of the tested species. The simplified method for testing fatigue strength at the limit of proportionality has shown its limited usefulness, requiring further analysis and comparison with other methods in order to be thoroughly tested and possibly improved.

PL

Badanie wytrzymałości zmęczeniowej wzdłuż włókien drewna przy różnej wilgotności. W pracy określono wpływ wilgotności drewna na wytrzymałość zmęczeniową przy ściskaniu wzdłuż włókien. Do pomiarów wykorzystano metodę wyznaczania maksymalnego naprężenia na granicy proporcjonalności. Wytrzymałość zmęczeniową zbadano dla trzech gatunków drewna: dębu szypułkowego (Quercus robur L.), brzozy brodawkowatej (Betula pendula Roth.) i świerka pospolitego (Picea abies L.), o dwóch wilgotnościach: zbliżonej do stanu absolutnie suchego i powyżej punkt nasycenia włókien. Stosunek wytrzymałości zmęczeniowej do wytrzymałości chwilowej zależy od zawartości wilgoci i jest podobny dla brzozy (70,3% w stanie suchym i 72,1% w stanie mokrym), dębu (67,4% i 69,5% w obu stanach) oraz świerka (66,6 % w stanie suchym i 68,1% w stanie mokrym). Zawartość wilgoci w drewnie wyraźnie wpływa na wielkość wytrzymałości zmęczeniowej drewna. Średnio wytrzymałość zmęczeniowa drewna o wilgotności powyżej punktu nasycenia włókien stanowi 0,20 wytrzymałości drewna o wilgotności bliskiej 0%. Tendencję tę stwierdzono niezależnie od badanego gatunku. Uproszczona metoda badania wytrzymałości zmęczeniowej na granicy proporcjonalności wykazała swoją ograniczoną przydatność, wymagającą dalszej analizy i porównania z innymi metodami w celu dokładnego przetestowania i ewentualnego udoskonalenia.

11

Święty dąb

75%

Domańska R.

Zieleń Miejska

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2020

|

tom Nr 10

42--45

PL

Drzewa od zawsze towarzyszą nam na naszej drodze życiowej. I to nie tylko jako zielone elementy w krajobrazie, które są piękne i latem dają cień, a deszcz kolorowych liści jesienią. Drzewa to także oś naszego postrzegania świata. Ludzie od zawsze uważali, że drzewa mają nam do zaoferowania znacznie więcej.

12

Micropropagation of oaks from seedlinng fragments

75%

Wesoly W. , Hauke M. , Lassocinski W. , Olszewska A.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2004

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tom 03

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nr 1

13

Root characterization of declining Quercus robur L. trees

75%

Przybyl K. , Pukacka S.

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1995

|

tom 10

14

Microfungi in the soil beneath common oak and their effect on Armillaria occurrence

75%

Kwasna H.

Acta Mycologica

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2003

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tom 38

|

nr 1-2

15

Fluctuations in mean stem volume of common oak (Quercus robur L.) depending on age of trees

63%

Kazmierczak K. , Pazdrowski W. , Szymanski M. , Nawrot M.

|

tom 39

16

Tannin content in acorns (Quercus spp.) from Poland

63%

Luczaj L. , Adamczak A. , Duda M.

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2014

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tom 72

EN

Oak acorns used to be an important human food, up until recent times. The major factor inhibiting their use in modern nutrition is their high tannin content. Polish oak trees were screened in order to find out whether there are any major geographical or interspecific differences in tannin and total phenolic contents in acorns, which might help us to establish further directions in the search for low-tannin individuals. We studied the level of phenolic compounds using the standard Polish and European Pharmacopoeia method, with Folin-Ciocalteu reagent and hide powder. Altogether 49 acorn samples of Quercus robur, 13 of Q. petraea, 1 of Q. pubescens (all native) and 12 of Q. rubra (introduced) were collected in different regions of Poland. The amount of investigated phenolics in Q. robur and Q. petraea acorns was similar, and tannins constituted the main component. The Q. pubescens sample was distinguished by the lowest tannin and total phenolic content and a relatively high amount of non-tannin phenolics. Q. rubra had a slightly lower tannin content than Q. robur and Q. petraea acorns, but the level of other phenolics was much higher. The results for Q. robur suggest geographical variability of phenolic content as well as a relationship between the phytochemical and biometric parameters of oak acorns.

17

Changes in DNA methylation of embryonic axes of seeds of oak and beech during in vitro culture and cryopreservation

63%

Nuc K. , Marszalek M. , Pukacki P. M.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2013

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tom 94

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nr 3

18

Research on wood submerged in the sea

63%

Pomian I. , Fojutowski A. , Wróblewska H. , Komorowicz M. , Kropacz A. , Noskowiak A.

Drewno : prace naukowe, doniesienia, komunikaty

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2010

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tom vol. 53, nr 183

101-111

EN

The Polish Maritime Museum in Gdansk participated in the EU project MACHU aiming at creation of a system of location, making information on European subaqueous maritime cultural heritage available and dissemination of it. 7 EU countries co-operated in the project. The Wood Technology Institute contributed to research on durability of small oak wood samples submerged in the sea. The samples were considered bioindicator of changes. The outline of research in the project is presented below.

PL

Centralne Muzeum Morskie w Gdańsku uczestniczyło w projekcie UE MACHU zmierzającym do stworzenia systemu lokalizacji, udostępnienia i upowszechnienia informacji o europejskim podwodnym morskim dziedzictwie kulturowym. W projekcie współpracowało 7 krajów UE. Instytut Technologii Drewna wziął udział w pracach w zakresie badań trwałości w warunkach zatopienia w morzu małych próbek drewna dębu traktowanych jako bioindykator zmian. Przedstawiono zarys badań w projekcie.

19

Analysis of pubescent oak (Quercus pubescens Willd.) by means of chloroplast DNA (cpDNA) in the western part of the Balkan Peninsula

63%

Ballian D. , Ivankovic M. , Grycan J. , Peric S. , Marjanovic H. , Bobinac M. , Slade D.

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nr 3

EN

In the area of the western Balkans, xerothermal broad-leaf forests hold a very special position, the main species being pubescent oak (Quercus pubescens Willd.). The study comprises 36 populations of pubescent oak from Croatia, Bosnia and Herzegovina, Montenegro, Kosovo, Albania and Macedonia. Genetic variability and population diversity was analysed on chloroplast DNA in order to determine to which haplotype an individual or studied population belongs, as well as how they are related. For the detection of one haplotype analysed four sequences (AS, TF, DT and CD) on the chloroplasts DNA. The results of the analysis suggest that there are six different haplotypes of pubescent oak (2, 4, 5, 17, 31, 33) in the studied populations. Two more sub-haplotypes were found in haplotype 5 (a and b), but only in populations occurring in Croatia and Bosnia and Herzegovina. The results suggest the great variability of pubescent oak in the researched area, which is generally characteristic of other species from the area of the Balkan Peninsula. The results obtained by means of cpDNA analysis can help in the formation of seed zones. However, due to the strong selection pressure of unplanned logging, and the possible introduction of herbal material of unknown origin, it is necessary to find a sufficient number of autochthonous entities (i.e., populations of the researched species) as well as new suitable markers for their characterization. The results of this paper constitute a scientifically recognised, partial examination of the origin of the starting forest reproductive material from the broader geographic area, thus serving future projects on its regeneration.

20

Impact of wood species used in surface layer on density distribution of particleboard

63%

Medved S.

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tom 50

|

nr 178

17-26