Wyniki wyszukiwania - Biblioteka Nauki

1

Analysis of the influence of larch fibers and particles on selected properties of fiber- and particleboards

100%

Pazio B. , Boruszewski P.

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

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2020

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tom No. 111

43--52

EN

Analysis of the influence of larch fibers and particles on selected properties of fiber- and particleboards. The paper presents the results of the research on the effect of the addition of fibers and particles obtained from European larch wood (Larix decidua Mill) from plantations on selected properties of fiber- and particleboards in comparison to the boards of the same structure based on typical industrial raw material (pine wood) uses by European wood based panels industry. The differences were shown in the tests, i.e.: modulus of rupture (MOR), modulus of elasticity in static bending (MOE), internal bond (IB), thickness swelling after 2 and 24 hours soaking in water and density profile. In the MOR and MOE tests, larch boards with a minimum 50% fiber share were characterized by comparable values of the properties determined to pine boards, while in the other variants, boards made of pine wood had better properties. In most cases, the larch boards were characterized by significantly lower values of swelling by thickness (with the exception of boards made of fibers) than boards made of wood from forest cultivation. The density profile of the boards on the cross-section of the plantation raw material did not differ from the boards made of pine raw material.

PL

Analiza wpływu udziału wiórów i włókien modrzewiowych na wybrane właściwości płyt wiórowo-włóknistych. W pracy przedstawiono wyniki badań wpływu dodatku włókien i wiórów pozyskanych z drewna modrzewia europejskiego (Larix decidua Mill.) pochodzącego z upraw plantacyjnych, na wybrane właściwości płyt wiórowo-włóknistych, w porównaniu z płytami o tej samej budowie bazującymi na typowym surowcu przemysłowym (drewnie sosnowym) używanym przez europejski przemysł płyt drewnopochodnych. Różnice wykazano w badaniach tj.: wytrzymałość na zginanie statyczne (MOR), moduł sprężystości przy zginaniu statycznym (MOE), wytrzymałość na rozciąganie prostopadle do płaszczyzn (IB), spęcznienie na grubość po moczeniu w wodzie oraz profil gęstości. W badaniach MOR i MOE płyty modrzewiowe z minimum 50%-owym udziałem włókien charakteryzowały się porównywalnymi względem płyt sosnowych wartościami oznaczonych właściwości, natomiast w pozostałych wariantach lepszymi właściwościami charakteryzowały się płyty wytworzone z drewna sosnowego. Płyty modrzewiowe w większości wariantów odznaczały się zdecydowanie niższymi wartościami spęcznienia na grubość (wyjątek stanowiły płyty wykonane z włókien), niż płyty z drewna pochodzącego z upraw leśnych. Profil gęstości płyt na przekroju poprzecznym wykonanych z surowca plantacyjnego nie odznaczał się różnicami względem płyt wykonanych z surowca sosnowego.

2

Three-phase extraction of European larch seeds in the local kiln and laboratory

86%

Aniszewska M.

Annals of Warsaw University of Life Sciences - SGGW. Agriculture

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2009

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nr 53 Agric.Forest Eng.

73-78

3

Przynależność gatunkowa drzewa z rezerwatu przyrody „Meteoryt Morasko”, w korzeniu którego utkwił fragment meteorytu

86%

Socha K. , Bednarz B. , Wąsik R.

Acta Societatis Metheoriticae Polonorum

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2014

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tom 5

97-103

EN

The fragment of root with the stuck of meteorite, originated from the „Morasko Meteorite” nature reserve were analysed to determine the species of the tree. Based on the macro characteristics and microscopic preparation techniques, the anatomical features of analysed wood is presented. Besides the cross-section of place where the meteorite had lodged in and the depreciation degree of wood is taken into consideration to obtain the probability time of meteorite impact. It is concluded that the meteorite have to stabbed into the living European larch, therefore it is very probably that it had happened not earlier than about 200–300 years ago.

PL

Poddany badaniom fragment korzenia wraz z wbitym weń meteorytem, pochodzącym z rezerwatu przyrody „Meteoryt Morasko”, został określony jako drewno modrzewiowe (Larix decidua Mill.). Zarówno stan zachowania drewna jak również jego stopień deprecjacji obok widocznego na przekroju poprzecznym, w miejscu utkwienia meteorytu, charakterystycznego przebiegu słojów rocznych, świadczących o podjęciu przez drzewo próby zabliźnienia rany, wskazują, że fragment meteorytu, który upadł na ziemię na obszarze obecnego rezerwatu przyrody „Meteoryt Morasko,” wbił się w żyjące drzewo modrzewia europejskiego. Miało to zatem miejsce najprawdopodobniej w okresie nie wcześniej niż około 200–300 lat temu.

4

Navrh zariadenia na novy sposob lustenia sisiek smrekovca opadaveho

86%

Bajla J. , Piszczalka J.

Prace Komisji Nauk Rolniczych. Polska Akademia Umiejętności

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1998

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tom 01

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nr 2

5

Ovule, megaspores, and female gametophyte formation in Larix decidua Mill. [Pinaceae]

86%

Slobodnik B. , Guttenberger H.

Acta Biologica Cracoviensia. Series Botanica

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2000

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tom 42

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nr 2

EN

Compared to the formation of male generative organs, the development of female sporogenous tissue of the European larch (Larix decidua Mill.) is considerably delayed. The young megaspore mother cell (megasporocyte, MMC) is not observable until late October, a short time before the period of dormancy. In early spring, MMCs become moderately enlarged, with intensive accumulation of starch grains around the nucleus. At the end of the first 10 days of March the MMCs become more rounded in section and the nucleus moves towards the basal part of the cell (near the chalaza). The integument and nucellus become observable at that time and chromosomal strands are visible in the MMC nuclei. Meiosis of MMCs was observed from mid-March to early April. During that period the tip of the integument grows gradually over the nucellus and creates the stigmatic apparatus of the ovule. Instead of the expected tetrads, triads of linearly arranged unequal megaspores were observed in individual ovules at the beginning of pollen shedding. Immediately after meiosis of the MMC, massive growth of the functional chalazal megaspore occurs, along with intensive free-nuclear divisions. The nuclei become located near the megaspore membrane, whereas the whole central part of the developing female gametophyte is filled with an extraordinarily large central vacuole. During intensive growth of the functional megaspore, the innermost layer of the nucellar tapetum gradually disintegrates. This development stage lasts until early May, when the megaspore membrane segregates partially from the nucellar tapetum and the free-nucleate female gametophyte assumes an irregular sac-like shape. The cellular stage of the female gametophyte with typical pyramidal cells at its micropylar end is visible at mid-May. Then the vacuolated (so-called frothy) archegonia gradually forms. The disappearance of vacuoles and the division of the central cell were registered in late May. At the stage of the large female gamete (egg cell) and the small ventral canal cell, the archegonia become fully receptive for fertilization. Our observations indicate that the development of the free-nucleate gametophyte and the formation of cell walls among the nuclei are the most sensitive phases of ovule development in the European larch before fertilization. During these stages, numerous cases of degeneration of the female gametophyte were observed, along with the complete deformation of ovules. The reasons for frequent irregularities are discussed here; the influence of meteorological and nutrient conditions seems especially important.

6

Proportion of sapwood and heartwood in stems of European Larch (Larix decidua Mill.) origin from provenances experimental plot

72%

Jakubowski M. , Szaban J. , Kowalkowski W. , Pawlaczyk A.

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

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2014

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tom 88

EN

Proportion of sapwood and heartwood in stems of European Larch (Larix decidua Mill.) origin from provenances experimental plot. The aim of this work was to statě wether the wood from different provenances of European Larch (Larix decidua Mili.) show differences in proportion of sapwood and heartwood in stems. Research were carried out on 56 trees erepresenting 6 provenances of larch: Bliżyn (10), Czerniejewo (5), Konstancjewo-Tomkowo (3), Krościenko (15), Rawa Mazowiecka-Trębaczew (6), Skarżysko (9). This plot is a part of unique research area established in 1966. Results show important differences between heartwood-sapwood proportion for two provenances: Krościenko - the heighest proportion (largest volume of heartwood) and Bliżyn the lowes proportion (least volume of heartwood). The other provenances show similar proportions.

PL

Udział drewna bielastego i twardzielowego w strzałach modrzewia europejskiego (Larix decidua Mill.) pochodzącego z powierzchni proweniencyjnej. Celem pracy było stwierdzenie, czy drewno pochodzące z różnych proweniencji modrzewia europejskiego (Larix deciuda Mill.) wykazuje różnice w udziale drewna bielastego i twardzielowego. Badania przeprowadzono wzdłuż osi strzał 56 drzew reprezentujących 6 pochodzeń modrzewia: Bliżyn (10), Czerniejewo (5), Konstancjewo-Tomkowo (3), Krościenko (15), Rawa Mazowiecka-Trębaczew (6), Skarżysko (9). Do badań udziału twardzieli wykorzystano współczynnik T będący stosunkiem szerokości drewna twardzieli do szerokości drewna bielu na przekroju poprzecznym. Udział twardzieli badano na całej długości strzały w odległościach co 2 m począwszy od podstawy pnia. W badaniach stwierdzono istotne różnice we względnym udziale drewna bielastego i twardzielowego w dwóch proweniencjach (Krościenko - największy udział twardzieli oraz Bliżyn - najmniejszy udział twardzieli).

7

Correlations between the Germination Capacity and Selected Attributes of European Larch Seeds (Larix Decidua Mill.)

72%

Kaliniewicz Z. , Markowski P. , Anders A. , Rawa T. , Liszewski A. , Fura S.

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2012

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tom nr 15(2)

229-242

EN

The critical transport velocity, basic dimensions (thickness, width and length), the angle of sliding friction and weight of European larch seeds from three batches were determined. The values of shape factors, cross-sectional area, volume and density were calculated for all seeds. The seeds were germinated, and germination time was determined. The investigated attributes were compared by single classification analysis of variance and correlation analysis. The germination capacity of seeds from the same stand varied between harvest years, and germination time was most highly correlated with critical transport velocity and density. The lightest seeds should be separated from the batch to improve germination capacity, and seeds of the heaviest fractions should be used to promote even germination.

8

Genetic aspect of differences in tracheid length of European larch families from seedling seed orchards

72%

Klisz M. , Michalska A.

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

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2012

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tom 78

9

Druckfestigkeit von Langstfasern der europaischen Larche (Larix decidua Mill.) verschiedener Provenienzen auf der Versuchsflache der LZD Siemianice

72%

Szaban J. , Kowalkowski W. , Jakubowski M.

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

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2013

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tom 84

10

The infestation of European larch Larix decidua Mill. dwarf shoots by Dasineura kellneri [Henschel] [Diptera: Cecidomyiidae] in the Ojcow National Park in Southern Poland

72%

Skrzypczynska M.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

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2007

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tom 10

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nr 1

11

Biegefestigkeit vom Holz der europaischen Larche (Larix decidua Mill.) auf der Versuchsflache der Forstuntersuchungsanstalt LZD Siemianice

72%

Szaban J. , Kowalkowski W. , Jakubowski M.

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

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2013

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tom 84

12

Logistics of the supplies of selected forest tree species' cones. Part 1. Cone density and substitution coefficient

72%

Aniszewska M. , Gendek A.

Annals of Warsaw University of Life Sciences - SGGW. Agriculture

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2016

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nr 67

13

Structure of dominance among tree species in relic Swiss stone pine (Pinus cembra L.) forests in Tatra Mountains

58%

Zieba A. , Rozanski W. , Szwagrzyk J.

Polish Journal of Ecology

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2020

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tom 68

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nr 2

14

Analysis of the influence of larch fibers and particles on selected properties of fiber- and particleboards

58%

Pazio B. , Boruszewski P.

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

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2020

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tom 111

15

Genetic control of the wood density, tracheid dimension and annual ring traits-an analysis of genetic and phenotypic correlation in European Larch

58%

Klisz M.

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

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2013

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tom 83

16

Owady zasiedlające szyszki modrzewia europejskiego Larix decidula Mill. w rezerwacie "Modrzewie" i jego otoczeniu (południowa Polska)

58%

Skrzypczynska M. , Sikora D.

Acta Agraria et Silvestria. Series Silvestris

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2013

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tom 51

EN

A field study on insects inhabiting cones of Larix decidua Mill. subsp. polonica (Racib.) Domin, was carried out in the protected forest reserve "Modrzewie" and its surrounding (the Krościenko Forest District) in 2011. A total of 2210 cones (12 samples) from larches were collected for analysis and for rearing. Moreover 3600 seeds extracted from cones, were analysed. During the studies 1687 insect specimens were obtained. They belong to 4 orders: Hemiptera, Coleoptera, Hymenoptera and Diptera. The most numerous species was Megastigmus pictus (Först.) (Hym., Torymidae): 850 specimens including 4 males. M. pictus destroyed 10.94% of analysed seeds. Strobilomyia laricicola (Karl) inhabited 13.06% of analysed cones. Information on parasitoids are given.

17

Fytoftoroza siewek modrzewia - wystepowanie i szkodliwosc

58%

Oszako T. , Orlikowski L. B.

Progress in Plant Protection

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2008

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tom 48

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nr 2

491-494

18

The Dunkeld larch (Larix x marschlinsii Coaz) in Estonia

58%

Sander H. , Laanelaid A.

Dendrobiology

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2007

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tom 57

73-80

EN

It is commonly known that Japanese larch, Larix kaempferi was first introduced in Europe in Great Britain in 1861. In the presence of European larches, L. decidua it was not long before the first hybrids between these species, called Dunkeld larches (Larix × marschlinsii), emerged there. It was found that there were several hybrid larch trees in Estonia that sprouted before one of their parent species was introduced in Europe. One of the oldest Dunkeld larches growing in Tallinn is about 210 years old. The radial growth of three Dunkeld larches in Estonia (in the cities of Pärnu and Tallinn and in the manor park of Suure-Kambja) and the determination of their age by cumulative growth graphs are discussed, with consideration given to the available knowledge on the introduction of Japanese larch. The conclusion is that there may have existed earlier alternative introduction routes of Japanese larch into northern Europe via Russia.

19

Percentage share of sapwood and heartwood in stems of European larch (Larix decidua Mill.) representing II and III class of age grown in different forest site types, representing main tree stand at Kraft biosocial classification

58%

Nawrot M. , Pazdrowski W. , Szymanski M.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2008

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tom 07

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nr 1

EN

The study is an attempt to determine share of sapwood and heartwood in stems of European larch trees from II and III class of age, grown in conditions of fresh coniferous mixed forest site (BMśw), fresh forest mixed site (LMśw), fresh forest site (Lśw). The highest hare of heartwood was observed in stems of European larch in conditions of fresh forest site Lśw, and the smallest in conditions of fresh coniferous mixed forest site (BMśw). Differences were also observed within the investigated classes of age, and higher share of heartwood observed in III class of age. The smallest share of heartwood characterized codominant trees and the highest dominant trees (from main tree stand in Kraft classification).

PL

W pracy podjęto próbę określenia udziału bielu i twardzieli w strzałach modrzewi europejskich reprezentujących II i III klasę wieku wyrosłych w warunkach BMśw, LMśw i Lśw. Największy udział twardzieli w strzałach modrzewi stwierdzono w warunkach Lśw, a najmniejszy na BMśw. Widoczne różnice zaobserwowano także pomiędzy badanymi klasami wieku, przy czym większy udział twardzieli stwierdzono w III klasie wieku. Najmniejszym udziałem drewna twardzielowego spośród drzew drzewostanu głównego według Krafta charakteryzowały się drzewa współpanujące, a największym drzewa panujące.

20

Uszkodzenia krotkopedow modrzewia europejskiego Larix decidua Mill. powodowane przez owady na wybranych stanowiskach Ojcowskiego Parku Narodowego

58%

Skrzypczynska M.

Acta Agraria et Silvestria. Series Silvestris

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1994

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tom 32

61-68

PL

W pracy podano wyniki badań uszkodzeń krótkopędów Larix decidua Mill., spowodowanych przez owady - szkodniki fizjologiczne. Analizowane krótkopędy (łąсznie 22 690) pobrano 30 modrzewi rosnących na 3 stanowiskach w Ojcowskim Parku Narodowym w 1493 r. Stwierdzono 6 gatunków owadów, wśród których najczęściej występowały: Coleophora laricella Hbn. i Adelges laricis Vall. Dane opracowano przy zastosowaniu wskaźnika frekwencji oraz wskaźnika Agrella współ- występowania gatunków.

EN

The study concerning the species composition of the primary physiological insect pests feeding on dwarf shoots of the European larch Larix decidua Mill. was earned out in the Ojców National Park, compartments 15, 29 and 31, in 1993. In each of these three compartments 10 larch trees, age class [-II, were chosen at random. From each tree 20 twigs (5 from each global direction), 50 cm long, were taken at random. In total 600 twigs were examined during the study. There were 22,690 dwarf shoots on all (he twigs examined out of which 4519 shoots (19,91%) were damaged. The following species caused (he damage: Adelges laricis Vall., Caleophora laricella Hbn., Spilonota laricana Hein., Pristiphora erichsoni Htg., pristiphora laricis Htg. and Dasineura kellneri (Henschel) (=Dasyneura laricis F. Lw.) The index of frequency (F) reached a highest value for Coleophora laricella (0,466), and a lowest for Pristiphora laricis (0,000002). The Agrell's index of species co-existence reached a highest value in cause of Coleophora laricella and Dasineura kellneri (0,290), and a lowest for Dasineura kellneri and Pristiphora erichsoni (0,006)