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    Wyświetlanie 1-9 z 9
    Tytuł:
    Rekreacyjna funkcja lasów Nadleśnictwa Krynki w opinii publicznej
    Recreational function of forests in the Krynki Forest District in the public opinion
    Autorzy:
    Gołos, P.
    Sikora, A.T.
    Konieczny, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/979375.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lasy
    funkcje lasu
    funkcje rekreacyjne
    zagospodarowanie rekreacyjne
    opinia publiczna
    leśnictwo
    Nadleśnictwo Krynki
    RDLP Białystok
    timber quality variation
    defects
    pinus sylvesrtis
    Opis:
    The aim of the research was to determine the impact of selected habitat and age features on the qualitative properties of Scots pine (Pinus sylvestris L.). The research was carried out on forest stands from the Olesno, Wymiarki and Kalisz Pomorski forest districts (western Poland). The collected data provided information on technical and dimensional properties as well as quality classes for logs from Scots pine stands. The severity of the occurrence of seven basic wood defects, identified on the perimeter and length of the model log was identified and described. The collected data was used to determine the distribution of defect groups. For distributions of defect groups, normal distribution criteria were met. For the Scots pine assortments, the ANOVA showed that the hypothesis of the occurrence of an equal number of defects on the side of the logs in three separated classes of WA0, WB0 and WC0 of the quality of the raw material should be rejected. For the Tukey test, the results indicate that there is no reason to reject this hypothesis. The obtained p−value in this case is 0.09 for WB0 and WC0. There was no influence of the diameter of the logs and the habitat on the number of defects. Number of defect groups is correlated with the distance from the butt in Kalisz Pomorski and Wymiarki forest districts but not in Olesno. In that case the increase in the number of defect groups has its maximum in the zone of 6−8 m of the log length.
    Źródło:
    Sylwan; 2019, 163, 11; 913-923
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność rozkładu wad drewna okrągłego w dojrzałych drzewostanach sosnowych
    Variability of the defects distribution round wood in mature pine stands
    Autorzy:
    Mirski, R.
    Wieruszewski, M.
    Malinowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/979370.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    sosna zwyczajna
    Pinus sylvestris
    drewno sosnowe
    wady drewna
    leśnictwo
    jakość drewna
    drewno okrągłe
    timber quality variation
    defects
    pinus sylvesrtis
    Opis:
    The aim of the research was to determine the impact of selected habitat and age features on the qualitative properties of Scots pine (Pinus sylvestris L.). The research was carried out on forest stands from the Olesno, Wymiarki and Kalisz Pomorski forest districts (western Poland). The collected data provided information on technical and dimensional properties as well as quality classes for logs from Scots pine stands. The severity of the occurrence of seven basic wood defects, identified on the perimeter and length of the model log was identified and described. The collected data was used to determine the distribution of defect groups. For distributions of defect groups, normal distribution criteria were met. For the Scots pine assortments, the ANOVA showed that the hypothesis of the occurrence of an equal number of defects on the side of the logs in three separated classes of WA0, WB0 and WC0 of the quality of the raw material should be rejected. For the Tukey test, the results indicate that there is no reason to reject this hypothesis. The obtained p−value in this case is 0.09 for WB0 and WC0. There was no influence of the diameter of the logs and the habitat on the number of defects. Number of defect groups is correlated with the distance from the butt in Kalisz Pomorski and Wymiarki forest districts but not in Olesno. In that case the increase in the number of defect groups has its maximum in the zone of 6−8 m of the log length.
    Źródło:
    Sylwan; 2019, 163, 11; 913-923
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związek typu ugałęzienia świerka pospolitego (Picea abies (L.) Karst.) z jakością surowca drzewnego
    Relationships between Norway spruce [Picea abies [L.] Karst.] branching type and timber
    Autorzy:
    Michalec, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1015618.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    typ ugalezienia
    drewno swierkowe
    Picea abies
    lesnictwo
    jakosc
    wady drewna
    swierk pospolity
    drzewa lesne
    norway spruce
    branching type
    timber quality
    wood defects
    Opis:
    As there are different views concerning the relationship between branching type and timber quality, the present paper attempts to evaluate this relationship. The studies were carried out on 32 sample plots located within the boundaries of two natural ranges of Norway spruce in Poland: north−eastern and south−western. The selected trees were examined for the type of branching, height and diameter at breast height, timber quality, size classes or groups in a butt−end section, and kinds or varieties of wood defects having an effect on timber grade classification. The analyses did not show any clear relationship between branching type and timber quality of Norway spruce.
    Źródło:
    Sylwan; 2008, 152, 06; 33-43
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kształtowanie się jakości surowca świerkowego w zależności od wysokości nad poziomem morza i wystawy
    The effect of altitude and exposure on the quality of spruce timber
    Autorzy:
    Michalec, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/973869.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Picea abies
    jakosc
    czynniki siedliska
    ekspozycja terenu
    leśnictwo
    drzewa leśne
    świerk pospolity
    drewno świerkowe
    wysokość nad poziomem morza
    spruce
    timber quality
    wood defects
    altitude
    exposure
    Polska
    Opis:
    Mountain regions are the main natural ranges of spruce forests in Poland. Their occurrence and growth in these areas is associated with the height above sea level and exposure. The attempt of the study was to determine the impact of these two characteristics on the quality of spruce timber. The research was carried out on 20 sample plots located in the Sudety (8 plots) and the Carpathians (12 plots). The trees growing on the selected plots were examined for their diameter at breast height and height, the quality of standing timber and the kinds and varieties of wood defects on tree stems. As a result of the conducted analyses it could generally be stated that forest stands from the lower montane zone produced higher quality timber in terms of both volume and quality and that the best quality stands were on the western and the poorest ones – on the southern slopes.
    Źródło:
    Sylwan; 2011, 155, 06; 373-383
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Częstotliwość występowania i struktura rodzajowa wad drewna u głównych gatunków lasotwórczych Beskidu Żywieckiego i Śląskiego w zależności od wysokości nad poziomem morza
    The effect of altitude on the frequency and types of wood defects in major forest tree species in the Beskid Zywiecki and Beskid Slaski Mountains
    Autorzy:
    Barszcz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/973792.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Abies
    buk
    czynniki siedliska
    Fagus
    Picea
    wady drewna
    wysokosc nad poziomem morza
    Beskid Śląski
    Beskid Żywiecki
    drzewa leśne
    gatunki lasotwórcze
    jodła
    leśnictwo
    świerk
    altitude
    wood defects
    timber quality
    Opis:
    The result of the research carried out in the Beskid Żywiecki and Beskid Śląski Mountains indicated the impact of altitude on certain qualitative properties of spruce, fir and beech timber. Significant differences were noted in the share of trees with defects, as well as in the observed types of wood defects in the examined timber depending on the climate/vegetation zone.
    Źródło:
    Sylwan; 2011, 155, 03; 171-178
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Value of merchantable timber in Scots pine stands of different densities
    Autorzy:
    Bembenek, M.
    Karaszewski, Z.
    Kondracki, K.
    Lacka, A.
    Mederski, P.S.
    Skorupski, M.
    Strzelinski, P.
    Sulkowski, S.
    Wegiel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/52755.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    merchantable timber
    timber
    timber value
    Scotch pine
    Pinus sylvestris
    stand density
    different density
    wood quantity
    wood quality
    Opis:
    Differences in the intensity of silvicultural treatments, as well as natural tree mort-ality, insect damage and fungal disease can eventually lead to variable stand density even on sites of the same quality. In addition, the bigger the initial stand density,the smaller the crown and trunk volume of single trees. The objective of theresearch was a detailed analysis of the impact of stand density on the total stand volume and value of merchantable timber. The area studied was in Drawno ForestDistrict, north-west Poland, on sites with sandy soil conditions typical for Scots pine (Pinus sylvestris L.). The total volume of merchantable roundwood wasmeasured on 20 sample plots (each covering an area of 0.5 ha) of which 19 were in 82-year-old stands and one in an 87-year-old stand. The stands were divided into three stand density groups (SDG), where the average number of trees growing per group was as follows: 547 (SDG I), 651 (SDG II) and 765 (SDG III). The volume ofa single tree was calculated using diameter (DBH) and height measurement. A qualityclassification of all 6432 tree stems was carried out in accordance with the Polish Standard. Statistical analysis did not indicate that density influenced the total timber volume of the stands studied, which was recorded as an average of 323 m3∙ha-1. However,statistically significant differences in the value of merchantable timber were observed:the highest value of 100 m3 of merchantable timber was recorded in SDG I (€ 5118.87), 6 and 12% higher than in SDGs II and III (€ 4842.09 and € 4565.80, respectively).The results obtained suggest that in the final phase (the last two age classes), pine stands growing in Polish conditions should be maintained at a lower stand density.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 192
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasoning Characteristics and Potential uses of Eucalyptus pilularis, Eucalyptus viminalis and Trichilia dregeana lumber tree species
    Autorzy:
    Kaba, Gemechu
    Desalegn, Getachew
    Powiązania:
    https://bibliotekanauki.pl/articles/1031739.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Eucalyptus pilularis
    Eucalyptus viminalis
    Lumber quality
    Trichilia dregeana
    moisture content
    seasoning
    seasoning defects
    shrinkage characteristics
    timber species
    Opis:
    Technical information on lumber seasoning, moisture content (MC), density, mechanical, workability and chemical characteristics would strongly determine rational utilization of each lumber species. A study was conducted on home-grown two Eucalyptus species (Eucalyptus pilularis and Eucalyptus viminalis) and one indigenous (Trichilia dregeana) timbers with the main objective of determining some characteristics of lumber that will indicate quality and proper utilization. Study species were harvested from Shashemene, Asella and Arjo sites, respectively. The experimental design for seasoning and density was complete randomized design, a factorial experiment. The experiments were conducted using air and kiln seasoning methods. To determine initial moisture content oven drying method was used. The mean initial MC for the three timber species were 48.25%, 56.1% and 65.45%, respectively. The species were classified as very rapid seasoning rate during kiln seasoning. The mean shrinkage values were Tangential (6.31, 4.94 and 4.43%), radial (3.4, 4.02 and 2.10%) volumetric (9.46, 8.6 and 6.37%), when they seasoned from green to 12% MC, respectively. Seasoning defects such as cup, bow, crook, end split, surface and end-checks were observed, though the extent varies with species. The density of E. pilulalris, E. viminalis and T. dregeana at 12% MC was 780, 810 and 530 Kg/m3, respectively. The one-way analysis of variance indicated that there was significant difference (P>0.001) in initial MC, final MC, density values at different MC and shrinkage characteristics. They revealed good lumber characteristics and qualities, comparable with many indigenous and home-grown exotic timber species in density, seasoning rate and shrinkage. The tree species have to be well managed, properly harvested and sawn. Boards have to be properly stacked and seasoned to about 12% MC, with kiln and air seasoning methods that can help to minimize seasoning time, seasoning defects, shrinkage characteristics and increase quality.
    Źródło:
    World News of Natural Sciences; 2020, 29, 3; 162-178
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza strat jakościowych i wartościowych w surowcu drzewnym w wyniku szkód huraganowych na przykładzie Nadleśnictwa Mircze (RDLP w Lublinie)
    The analysis of losses in timber quality and value resulting from the hurricane damage on the example of Mircze Forest District
    Autorzy:
    Nagadowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012502.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    huragany
    Nadlesnictwo Mircze
    drzewostany pokleskowe
    straty wartosciowe
    szkody w lesie
    straty jakosciowe
    RDLP Lublin
    surowce drzewne
    lesnictwo
    quality loss
    value loss
    timber
    hurricane
    Opis:
    The study presents analysis of the quality and value losses in timber in the selected stand in Mircze Forest District what was damaged by the hurricane. The analysis showed changes in the wood classification resulting from the timber depreciation and value losses being the result of lowering the total amount of timber sold after the hurricane and also the decrease in prices of timber.
    Źródło:
    Sylwan; 2008, 152, 07; 46-52
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wad projektowych i wykonawczych konstrukcji hali sportowej z drewna klejonego warstwowo
    Design and erection faults analysis of sport halls glulam structure
    Autorzy:
    Nowak, T.
    Raszczuk, K.
    Jasieńko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/161570.pdf
    Data publikacji:
    2013
    Wydawca:
    Polski Związek Inżynierów i Techników Budownictwa
    Tematy:
    hala sportowa
    konstrukcja ramowa
    rama drewniana
    drewno klejone warstwowo
    jakość
    stan techniczny
    analiza statyczna
    sport hall
    frame structure
    wooden frame
    glued laminated timber
    quality
    technical condition
    static study
    Opis:
    W pracy przedstawiono wyniki analiz, niewłaściwie zaprojektowanej i wykonanej, konstrukcji z drewna klejonego warstwowo hali sportowej. Skutkiem popełnionych błędów są spękania w każdym z węzłów konstrukcji drewnianej, a w konsekwencji wyłączenie jej z eksploatacji od 2006 roku. Przeprowadzone i opisane prace badawcze wskazują na niewłaściwie zaprojektowane połączenia oraz nieprawidłowe składowanie i montaż elementów drewnianych.
    The paper presents the results of analysis of poorly designed and build the glued laminated timber frame structure of sport hall. The analysis is connected with capacity and stiffness of the elements and fasteners, as well.
    Źródło:
    Przegląd Budowlany; 2013, R. 84, nr 10, 10; 23-27
    0033-2038
    Pojawia się w:
    Przegląd Budowlany
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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