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    Wyświetlanie 1-6 z 6
    Tytuł:
    Inwentaryzacja odnowienia lasu i jego uszkodzen przez jeleniowate w Gorczanskim Parku Narodowym
    Autorzy:
    Miscicki, S.
    Zurek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/811281.pdf
    Data publikacji:
    1995
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Cervidae
    Gorczanski Park Narodowy
    jeleniowate
    lowiectwo
    szkody w lesie
    odnowienia lasu
    drzewostany mlode
    lesnictwo
    inwentaryzacja wielkopowierzchniowa
    szkody lowieckie
    Źródło:
    Sylwan; 1995, 139, 10; 53-69
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagęszczenie i dynamika procesu wydzielania drzew w młodocianych drzewostanach brzozowych na gruntach porolnych
    Stand density and self-thinning dynamics in young birch stands on post-agricultural lands
    Autorzy:
    Socha, J.
    Zasada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991052.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    grunty porolne
    uprawy lesne
    drzewostany brzozowe
    drzewostany mlode
    zageszczenie drzew
    wydzielanie sie drzew
    self−thinning
    silver birch
    abandoned farmlands
    stochastic frontier function
    quantile regression
    Opis:
    The study describes allometric relationships between stand density and tree dimensions in birch stands on post−agricultural lands. The research material consisted of measurements carried out on 120 sample plots located in birch stands on post−agricultural lands of Central Poland. The investigated relationship was analyzed using ordinary least squares (OLS), dynamical formulation of allometric function (DFA), stochastic frontier production function (SFF) as well as quantile regression (QR) methods. Similar effects of modeling maximum density were obtained as a result of applying FFP and QR methods with 0.9 quantile. SFF was found to be the most adequate method for modeling maximum density.
    Źródło:
    Sylwan; 2014, 158, 05; 340-351
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie rozkładów pierśnic młodocianych drzewostanów brzozy brodawkowatej na gruntach porolnych za pomocą dwuparametrowego rozkładu Weibulla
    Modeling dbh distribution of young silver birch stands on former agricultural lands with the 2-parameter Weibull distribution
    Autorzy:
    Zasada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991512.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewostany mlode
    grunty porolne
    drzewostany brzozowe
    brzoza brodawkowata
    Betula pendula
    piersnice drzew
    rozklad piersnic
    modelowanie
    rozklad Weibulla
    betula pendula
    secondary succession
    diameter distribution
    weibull
    Opis:
    The paper presents the diameter distributions of young silver fir stands (Betula pendula Roth.) growing on former agricultural lands described using the 2−parameter Weibull distribution. Various methods of parameters' estimation were tested: maximum likelihood method, method of moments and percentile approach. It was found, that the diameter distributions in such birch stands can have various shapes and forms – from close to the exponential to almost normal. The shape parameter were not affected by the age of the stand, but the scale parameter was strongly correlated with age. The most efficient methods for the tree diameter distribution modeling using the 2−parameter Weibull distribution are the method of moments and the maximum likelihood method. However, the obtained results does not exclude the percentile method, which is relatively simple and can be further modified for obtaining better results.
    Źródło:
    Sylwan; 2013, 157, 04; 268-277
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ jakości siedliska na dynamikę wydzielania brzozy na gruntach porolnych
    Effect of site quality on self-thinning dynamics in silver birch stands on abandoned farmlands
    Autorzy:
    Bijak, S.
    Bronisz, K.
    Szydłowska, P.
    Wojtan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/991005.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    grunty porolne
    zalesianie
    odnowienia lasu
    drzewostany brzozowe
    drzewostany mlode
    brzoza brodawkowata
    Betula pendula
    wydzielanie sie drzew
    czynniki siedliska
    bonitacja siedliska
    stand density
    site index
    silver birch
    afforestation
    central poland
    Opis:
    Paper discusses the influence of site quality on self−thinning process in silver birch stands growing on abandoned farmlands in Mazowieckie region (central Poland). Number of trees in a stand decreases with increasing age. The better the site (the higher site index value), the higher number of trees can be observed. However at the age of 10 difference between sites of various quality (site index) become insignificant. There is no need to include site index into the self−thinning models for young silver birch stands.
    Źródło:
    Sylwan; 2014, 158, 06; 423-430
    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:
    Uszkodzenia drzew i odnowienia w wyniku ręczno-maszynowego pozyskania drewna z wykorzystaniem urządzeń agregowanych z ciągnikami rolniczymi
    Damage to trees and regeneration as a result of motor-manual timber harvesting using equipment aggregated with farm tractors
    Autorzy:
    Stańczykiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/973972.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    odnowienia lasu
    pozyskiwanie drewna
    procesor HYPRO
    procesor NIAB 5-15
    technologia pozyskiwania
    uszkodzenia drzew
    wciagarka Fransgard 6000 GS
    ciecia pielegnacyjne
    zebiegi pielęgnacyjne
    agregaty ciągnikowe
    ciągniki rolnicze
    drzewostany młode
    leśnictwo
    drzewa leśne
    thinning processor
    cable winch
    farm tractor
    selective early thinning
    pine stands
    Opis:
    The research was conducted in thinned pine stands, age class II, where cutting was carried out with chainsaws. Subsequent operations were performed using a NIAB 5−15 and HYPRO 450 delimber−bucker processor and a FRANSG RD 6000 cable winch aggregated with farm tractors. The timber harvesting technology was applied with a cut−to−length system using processors, and with a tree−length system using a cable winch. In the selected stands, nine study plots were established, in which the inventory of stand layers: trees and undercanopy regeneration was carried out twice (before and after felling). Based on the obtained data, the level of damage to trees and regeneration after thinning operations was calculated. In the case of the technology using processors, the level of damage to trees in individual manipulation plots was within the range of 4.3%−8.6% (total 7%), while for the winch technology it was from 3.1% to 5.8% (total 4.5%). As regards regeneration, damage resulting from the harvesting and skidding of timber using processors in individual manipulation plots was at a level of 4.1%−13.5% (total 8.5%) and damage resulting from the harvesting and skidding using a winch cable from 5.8% to 17.0% (total 9%).
    Źródło:
    Sylwan; 2011, 155, 02; 129-137
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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