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    Wyświetlanie 1-12 z 12
    Tytuł:
    Procesy regeneracji pni drzew po zranieniu
    Processes of tree stem regeneration after wounding
    Autorzy:
    Zajączkowska, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1019100.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    regeneracja
    uszkodzenia drzew
    pnie drzew
    lesnictwo
    drzewa lesne
    tree
    stem regeneration
    . stem wounding
    wound healing
    cambium regeneration
    Opis:
    The review of regeneration processes after tree stem wounding is given. The wounds can be caused by various abiotic and biotic factors and also by human activities. The regeneration processes differ between shallow and deep wounds. Regeneration of deep stem wounds involves both filling the cavity and regeneration of the cambial surface. The pattern of cambial activity and differentiation xylem tissues are modified at various distances from the wound edges. Involvement of mechanical stress in the regeneration processes is discussed.
    Źródło:
    Sylwan; 2006, 150, 03; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efekt biotyczny pomiędzy grzybami zasiedlającymi drewno modrzewiowe a pniarkiem modrzewiowym (Fomitopsis officinalis)
    Biotic effect between the fungi colonising larch wood and Fomitopsis officinalis
    Autorzy:
    Piętka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1019104.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Fomitopsis officinalis
    drewno modrzewiowe
    interakcje miedzy grzybami
    modrzew
    lesnictwo
    modrzewnik lekarski
    grzyby celulolityczne
    drzewa lesne
    mikologia
    tree
    stem regeneration
    . stem wounding
    wound healing
    cambium regeneration
    Opis:
    The review of regeneration processes after tree stem wounding is given. The wounds can be caused by various abiotic and biotic factors and also by human activities. The regeneration processes differ between shallow and deep wounds. Regeneration of deep stem wounds involves both filling the cavity and regeneration of the cambial surface. The pattern of cambial activity and differentiation xylem tissues are modified at various distances from the wound edges. Involvement of mechanical stress in the regeneration processes is discussed.
    Źródło:
    Sylwan; 2006, 150, 03; 11-16
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retrospektywna analiza wybranych właściwych liczb kształtu strzał dębu
    A retrospective analysis of the selected true form factors for oak
    Autorzy:
    Turski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/972838.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    lesnictwo
    dab
    wlasciwa liczba ksztaltu strzaly
    drzewa lesne
    Quercus
    true form factor
    oak stem
    Opis:
    The paper presents a retrospective analysis of the selected form factors for oak stems. The analysis of twelve true form factors (f L/15, f L/10, f L/9, f L/8, f L/7, f L/6, f L/5, f L/4, f 3/10L, f L/3, f 4/10L, f L/2) was done to find the lowest value of the variation coefficient in the successive five−year intervals of tree lives. The relationship between the form factors and dbh over bark, height and slenderness of trees was also analysed.
    Źródło:
    Sylwan; 2003, 147, 07; 31-39
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza przyrostów rocznych dwóch sosen (Pinus sylvestris L.) o nietypowej budowie strzały na terenie Nadleśnictwa Borne Sulinowo
    Analysis of tree rings of two atypical pines (Pinus sylvestris L.) in the Borne Sulinowo Forest District
    Autorzy:
    Koprowski, M.
    Zielski, A.
    Skowronek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008867.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Nadlesnictwo Borne Sulinowo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    strzala drzew
    anomalie rozwojowe
    dendrochronologia
    przyrosty roczne
    dendrochronology
    scots pine
    atypical stem
    Opis:
    The study aimed at dendrochronological and dendroclimatological analysis of radial increments of two Scots pine specimens of atypical stems (fig. 1). Investigated trees grow in the Borne Sulinowo Forest District (tab.). Although the individuals differ with age, the anomaly occurs almost in the same time (fig. 2). Tree−ring widths of analysed pines show greater similarity before the anomaly onset. Atypical stem construction results in variable growth pattern within individual tree. Samples from ‘ridges' are more similar to the master chronology. Climate conditions (temperature in April and June) significantly influence tree ring formation within ‘rows' of tree at site #2 (fig. 3−4). Frost damages originating from extremely low temperature in winter 1956 may be the cause of the observed stem anomaly.
    Źródło:
    Sylwan; 2011, 155, 08; 555-562
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie trygonometrycznego modelu zbieżystości do określania kształtu strzał świerka
    The use of a trigonometric taper model for the determination of the shape of spruce stems
    Autorzy:
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1023459.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    modele ksztaltu
    dendrometria
    Picea abies
    lesnictwo
    trygonometryczny model zbiezystosci
    ksztalt strzaly
    swierk pospolity
    drzewa lesne
    stem shape
    shape model
    taper model
    norway spruce
    Opis:
    On the basis of sectional measurements of diameters of trees from 5 sawtimber spruce stands in the Beskid Śląski and Beskid Żywiecki, a non−linear shape model for spruce stems has been developed using a trigonometric model [Bi 2000]. Subsequently, the accuracy of the proposed solution has been evaluated and compared with the accuracy of a linear model [Socha 2000]. The discussed non−linear model for describing the shape of stems is quite satisfactory, however, with regard to the accuracy of the determination of the stem morphological curve and volume this solution is inferior to the linear model.
    Źródło:
    Sylwan; 2004, 148, 04; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model zbieżystości strzał dla górskich drzewostanów świerkowych średnich klas wieku
    A taper model for mountain spruce stands in medium age classes
    Autorzy:
    Socha, J.
    Kubik, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1022889.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zbiezystosc strzaly
    dendrometria
    model zbiezystosci
    drzewostany swierkowe
    lasy gorskie
    Picea abies
    lesnictwo
    strzala drzew
    swierk pospolity
    stem shape
    shape model
    taper model
    norway spruce
    Opis:
    The taper model presented in this paper was built for the mountain spruce stands in medium age classes. The model was described by multiple regression equations determining the thickness of a tree stem at different relative heights. Three variants of equations were proposed. In the simplest equation, d.b.h. and tree height were the explanatory variables while in the remaining equations height and thickness at half of the stem height were additional variables. The solution proposed in the paper allows for a precise estimation of the volume of stems and stem sections. At the same time it is free from systematic errors. The developed taper model can find practical application in determining tree shape, volume and timber assortment classes in forest inventories, standing tree quality assessment and stand pricing.
    Źródło:
    Sylwan; 2005, 149, 01; 42-52
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Występowanie Phytophthora cactorum na jarząbie zwyczajnym (Sorbus aucuparia) w szkółkach leśnych
    The occurrence of Phytophthora cactorum on rowan (Sorbus aucuparia) in forest nurseries
    Autorzy:
    Orlikowski, L.B.
    Duda, B.
    Oszako, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1023374.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wystepowanie
    grzyby
    czynniki chorobotworcze
    Phytophthora cactorum
    szkolki lesne
    Sorbus aucuparia
    lesnictwo
    jarzab pospolity
    drzewa lesne
    fitopatologia lesna
    phytophthora spp.
    inoculation
    rowan
    disease
    stem necrosis
    isolation
    Opis:
    Phytophthora cactorum was isolated from about half of the rowan seedlings taken from 2 nurseries. Additionally, Botrytis cinerea and Fusarium solani were found in diseased tissues. In laboratory trials, the pathogen colonized plants of the family Rosaceae, and most especially Prunus avium, Pyrus communis and Rosa canina, as well as Alnus glutinosa, Betula verrucosa and coniferous plants. In a greenhouse trial, isolates from rowan and rhododendron were found to cause necrosis of the stem base, with a rate of disease spread of about 1.3 mm/24 h.
    Źródło:
    Sylwan; 2004, 148, 10; 67-72
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pośredni sposób budowy modelu przekroju podłużnego strzały bez kory sosny
    An indirect method of building a taper model construction for pine stem inside bark
    Autorzy:
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/973592.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Pinus
    dendrometria
    sosna
    strzala drzew
    wzory empiryczne
    leśnictwo
    strzała drzew
    model przekroju podłużnego strzały
    drzewa leśne
    taper model
    stem section
    bh form factor
    volume share
    pine
    Opis:
    An indirect method of a taper model construction for pine stems utilizes function for the volume shores of stem sections determination. The (separated) functions were developed for 15 equal stem sections. Empirical equations were also developed to determine the volume of stems inside bark. This allows to determine the diameter at any point on the stem, and thus creates the basis to determine volume for any section of the stem.
    Źródło:
    Sylwan; 2004, 143, 08; 3-7
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określania świeżej masy strzał jodły na podstawie przeliczników wagowo-objętościowych
    Accuracy of estimation silver fir stem mass on the basis of volume to weight conversion factors
    Autorzy:
    Ochal, W.
    Wertz, B.
    Grabczyński, S.
    Orzeł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/985798.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    jodla pospolita
    Abies alba
    biomasa drzewna
    masa strzaly drzew
    biomasa swieza
    szacowanie biomasy
    wspolczynniki wagowo-objetosciowe
    gestosc drewna
    abies alba
    wood density
    stem biomass
    biomass estimation
    Opis:
    The paper describes the accuracy of estimation of silver fir stem fresh mass on the basis of volume to weight conversion factor, derived from samples, collected from few different places along the stem. The research material contained 13 sample trees selected from homogenous 70−years old stand, situated in mountainous area of the Beskid Sądecki in Polish part of the Carpathians (S Poland). Volume over the bark of sample trees was calculated with section−wise method and the whole stem fresh biomass was directly weighted. For each sample tree three stem discs were collected at 1/6, 1/2 and 5/6 of tree height, their weight and volume were precisely determined and the biomass conversion factors (equivalent of stem density) were calculated. The assessment of the accuracy of whole fresh stem biomass was conducted according to five variants: for the biomass conversion factors derived from each individual stem disc (lower, middle or upper), from weighted mean density and on the basis of the constructed mixed model, where relative height and diameter were treated as fixed effects and influence of individual trees was included as a random term. The volume of sample fir stems ranged from 0.15 to 2.22 m3, while their fresh biomass varied between 138.1 and 1896.7 kg. Obtained results show that variation of the density was higher within stems than between them (coefficient of variation amounted to 8.4% i 3.3% respectively). The average density increased along stem, from 835.6 kg/m3 for lower part (1/6H) to 986.8 kg/m3 for the upper part (5/6H). Estimating the biomass on the basis of just lower stem disc resulted in the average relative error equal to –5.8%, while for middle stem disc the error was +1.2%, and for upper disc +11.3%. The use of conversion factors derived from weighted average density of all three stem discs resulted in average bias equal to –1,7% with standard error 1,0%. Despite the presence of mean bias of –2.3%, the constructed density model gave the most precise estimation of the stem biomass (standard error 0.7%), which indicates the reasons for its further improvements and usage.
    Źródło:
    Sylwan; 2018, 162, 04; 277-287
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring uszkodzeń spowodowanych przez jeleniowate w młodych drzewostanach i odnowieniach Gorczańskiego Parku Narodowego
    Monitoring of the deer-related damage to the young stands and regeneration in the Gorczanski National Park
    Autorzy:
    Miścicki, S.
    Żurek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/989815.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy
    Gorczanski Park Narodowy
    drzewostany mlode
    odnowienia lasu
    odnowienia podokapowe
    szkody w lesie
    uszkodzenia drzew
    szkody lowieckie
    jeleniowate
    monitoring
    bark−stripping
    browsing
    district
    impact
    protection
    stem
    terminal shoot
    Opis:
    Assessment of the impact of large herbivores on young generation of trees in the protected forests can support decisions about whether to intervene in natural ecosystems (e.g. individual tree protection, animal culling) or not. A study on the condition of forest regeneration, including the assessment of the damage caused by deer, was performed in the Gorczański National Park (GNP; southern Poland) in 1993 for the first time. The inventory was repeated in 1996 and 2011 on the same 415 concentric permanent sample plots located in the centers of 400×400 m grid. Trees with diameter <16 cm or height 1.3 m were counted. The impact of deer was assessed using: (i) the share of browsed terminal shoots in h=0.3−1.3 m class trees and the tolerable (based on a reference) share of browsed trees of such height with the most damaged tree species taken into account and (ii) the proportion between the density of recently (the previous year) debarked, frayed or broken trees and the tolerable (based on a reference) density of such trees. The main interpretation unit was composed of all stands in the GNP, while stands in particular protection districts formed lower level. Over the time, the density of trees in the regeneration layer increased (fig. 1). The density of recently debarked (frayed or broken) trees decreased considerably (fig. 2), even if a large number of trees (especially silver fir) with old wounds existed (fig. 4). The density of the browsed trees remained more or less unchanged. This type of damage most frequently affected silver fir, sycamore maple and rowan (fig. 3). Differences between the level of forest regeneration damage in different protection districts of the GNP remained similar (fig. 5). The deer impact assessed on the basis of the density of debarked trees significantly decreased to be classified as tolerable in 2011. However, the impact assessed with the share of trees with the browsed terminal shoot did not reach the tolerable level in one protection district. Results show that measures undertaken to protect forest regeneration produce a partially positive effect. The browsing level was still too high. Differences in the deer impact on the forest regeneration between protection districts can be considered as permanent ones.
    Źródło:
    Sylwan; 2015, 159, 06; 505-515
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Udział bielu i twardzieli w strzałach sosen zwyczajnych (Pinus sylvestris L.)
    Autorzy:
    Pazdrowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1023792.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    warunki siedliskowe
    uzytkowanie lasu
    sosna zwyczajna
    lesnictwo
    strzala drzew
    drewno bielu
    bor mieszany swiezy
    drewno twardzieli
    Pinus sylvestris
    drzewa lesne
    pruning
    sapwood
    heartwood
    stem
    scots pine
    forest site type
    Opis:
    In this paper the attempt has been made to determine the proportion of sapwood and heartwood in pruned and non−pruned stems of Scots pine growing in the fresh mixed coniferous forest. Research results have shown that the proportion of heartwood in pruned pine stems was higher than in non−pruned ones. This was particularly noticeable after 24 years from the treatment while after 51 years this regularity was less distinct.
    Źródło:
    Sylwan; 2004, 148, 03; 21-27
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność proweniencyjna olszy czarnej w Polsce
    Provenance variability of black alder in Poland
    Autorzy:
    Rożkowski, R.
    Mejnartowicz, L.
    Guzicka, M.
    Dorobek, K.
    Chmura, D.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/979576.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    proweniencje
    wysokosc drzew
    piersnice drzew
    piersnicowe pole przekroju
    miazszosc drzew
    zmiennosc proweniencyjna
    alnus glutinosa
    diameter
    diversity
    height
    population
    productivity
    stem straightness
    Opis:
    European black alder (Alnus glutinosa (L.) Gaertn.) is a widespread tree species associated with wetlands and riparian ecosystems, thus it plays an important ecological role. Due to its fast growth and favorable wood properties it also has a potential to satisfy a growing demand for wood and fiber. However, its growth potential is not fully realized in Poland. In this study we investigated variation in growth traits, productivity, and stem straightness among 11 populations of European black alder originating from the lowland distribution of the species in Poland. The common−garden experiment located in 1968 in Kórnik (mid−western Poland) has been so far the only provenance experiment with this species in our country. We measured height and diameter of all trees at the site, assessed stem straightness in a 5−step scale (1−crooked; 5−straight), and calculated productivity at age of 50 years, which should be considered close to the rotation age. We found significant variation among populations in all investigated traits. The difference in productivity between the best and the worst provenance reached 75%. Using published and unpublished data from previous measurements at this site we also analyzed a trend in provenance ranking through time. The best and worst provenance could be identified at age 16 years, but many ranking shifts took place afterwards at the intermediate rank positions. We conclude that growth, productivity and stem quality of black alder could be improved through selection of favorable provenances within the species. Selection decisions can be made at the age below the half the rotation age, although decisions at 3/4 of rotation age would be more precise.
    Źródło:
    Sylwan; 2019, 163, 10; 830-838
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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