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    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:
    Ocena naturalnego i sztucznego odnowienia drzewostanów sosnowych Pinus sylvestris L. w Nadleśnictwie Nowa Dęba
    Evaluation of the natural and artificial regeneration of Scots pine Pinus sylvestris L. stands in the Forest District Nowa Deba
    Autorzy:
    Długosiewicz, J.
    Zając, S.
    Wysocka-Fijorek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1291496.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    hodowla lasu
    odnowienia lasu
    drzewostany sosnowe
    odnowienia naturalne
    odnowienia sztuczne
    sosna zwyczajna
    Pinus sylvestris
    jakosc hodowlana
    wzrost roslin
    zywotnosc drzew
    zdrowotnosc drzew
    zageszczenie drzew
    stopien pokrycia terenu
    Opis:
    The main purpose of this article was to highlight the potential for enhancing positive silvicultural effects and their dependency on the management method in Scots pine Pinus sylvestris L. stands. We therefore assessed the impact of natural and artificial regeneration on vitality and health, compaction, surface coverage and seedlings height. Another important goal was to assess the severity of damage in the selected forest sites. A comparative analysis was carried out based on results from field work conducted in the autumn 2010 in the Forest District Nowa Dęba. As part of this field work, also the breeding quality of the analyzed pine renewals was assessed. The obtained results indicate that natural regeneration of Scots pine under the conditions of a fresh coniferous forest as well as a fresh mixed coniferous forest is the most reasonable management practice. In wet mixed coniferous forests however, the naturally regenerating Scots pine seedlings are of lower silvicultural quality and growth parameter values compared to those in artificially regenerated stands. In fresh mixed broadleaved forests, naturally regenerated Scot pine trees showed slightly lower silvicultural quality and vitality than artificially regenerated trees. Our results indicate furthermore that there are indeed conditions under which the restoration of Scots pine in the Nowa Dęba Forest District using natural regeneration is preferable. We also found that the employed method of renewing has a significant impact on pine growth parameters in the moist mixed coniferous forest habitat. Naturally renewing pines are characterized by a lower overall viability, but at the same time natural regeneration provides a larger number of individuals with the best viability (1st vitality class), which can be a valuable selection basis for trees used in breeding.
    Źródło:
    Leśne Prace Badawcze; 2019, 80, 2
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określenie zagęszczenia drzewostanów z wykorzystaniem danych z lotniczego skanowania laserowego
    Determination of stand density using data from airborne laser scanning
    Autorzy:
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/994409.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany gospodarcze
    drzewostany sosnowe
    drzewostany mieszane
    inwentaryzacja
    zageszczenie drzew
    lotniczy skaning laserowy
    wysokosciowy model korony
    segementacja drzewostanu
    forestry
    segmentation
    chm
    accuracy
    Opis:
    Airborne laser scanning (ALS) technology allows collecting data describing top forest layer in a very accurate way. This provides a possibility to generate crown height models (CHM) with resolution in which single tree crowns can be detected. In presented study highly automatic algorithm for single tree detection is presented. FALCON II ALS acquired data in Forest Experimental Station in Rogów (central Poland). Data used for algorithm accuracy evaluation were acquired by measuring sample plots on VSD photogrammetric station. CHM with the resolution of 0.5 m has been used in the presented research. Algorithm, in automatic or semi−automatic way, defines single crowns. Each of the end segments was additionally processed for correctly defined size and area of the crown projection. Received accuracy of correctly detected trees was 69% for all samples (71% for pine stands and 61% mixed stands) in automatic method and 74% (78% and 65% respectively) in semi−automatic method.
    Źródło:
    Sylwan; 2013, 157, 08; 607-617
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura drzewostanów Tatrzańskiego Parku Narodowego – wyniki inwentaryzacji z lat 2016-2017
    The structure of forest stands in theTatra National Park: The results of 2016-2017 inventory
    Autorzy:
    Bodziarczyk, J.
    Szwagrzyk, J.
    Zwijacz-Kozica, T.
    Zieba, A.
    Szewczk, J.
    Gazda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/45954.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    parki narodowe
    Tatrzanski Park Narodowy
    lasy gorskie
    struktura drzewostanu
    inwentaryzacja drzewostanow
    lata 2016-2017
    stale powierzchnie badawcze
    miazszosc drzew
    zageszczenie drzew
    drzewa zywe
    drzewa martwe
    Źródło:
    Leśne Prace Badawcze; 2019, 80, 1
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określanie miąższości i zagęszczenia drzew w drzewostanach centralnej Polski na podstawie danych lotniczego skanowania laserowego w dwufazowej metodzie inwentaryzacji zasobów drzewnych
    A two-phase inventory method for calculating standing volume and tree-density of forest stands in central Poland based on airborne laser-scanning data
    Autorzy:
    Miścicki, S.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318835.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Polska Centralna
    drzewostany
    zasoby drzewne
    inwentaryzacja
    lotniczy skaning laserowy
    drzewa lesne
    miazszosc drzew
    zageszczenie drzew
    wysokosciowy model korony
    centroid
    ground-based data
    forest inventory
    scaling
    airborne ceiling
    Crown Height Model
    Opis:
    This paper describes a method of determining the stocking density and volume of forest stands based on airborne laser-scanning data. The aim of this study was to determine the relationship between ground-based measurements of standing volume and tree-density, and those acquired based on the Crown Height Model (CHM) interpolated from airborne laser-scanning data. Data were collected from 34 sample plots of two sizes for the CHM analysis: 500 m2 (radius 12.61 m) and 1963.5 m2 (radius of 25.0 m): Trees for sampling were selected using two methods, those whose “centroid” was fully within the sample plot (the tree was considered to be within the sample plot if the centroid of the crown was inside the circle) and those at the “border” (the tree was included in the sample plot if, at least, one part of the contour of the crown was inside the circle). There was a strong relationship (R2 = 0.86) between standing volume measured in sample plots on the ground and the indices produced by the crown elevation model at the locations where the ground-based measurements were performed.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 2; 127-136
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamika naturalnych faz rozwojowych drzewostanów w Białowieskim Parku Narodowym
    Dynamics of the natural development phases of stands in the Bialowieski National Park
    Autorzy:
    Miścicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008733.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    parki narodowe
    Bialowieski Park Narodowy
    drzewostany
    las naturalny
    fazy rozwojowe
    zasobnosc drzewostanu
    zageszczenie drzew
    odnowienia lasu
    przyrost miazszosci
    przyrost biezacy
    dynamika drzewostanu
    natural forest
    regeneration
    sample plot
    standing volume
    change
    Opis:
    The aim of the research was to determine the current changes occurring in the natural forest using the classification based on the natural phases of stand development. The oldest part of the Białowieski National Park, formerly known as the Strict Reserve, was the object of the study. Material was collected from temporary sample plots (460 ones both in 1995 and 2005) and 160 permanent sample plots (in the years 2000, 2002 and 2004). Leibundgut’s classification was used to determine the natural development phases. All of them occurred in the Białowieski National Park in variable proportions, and this structure changed during the study period. They differed in terms of standing volume, tree density, total tree height of regeneration, current volume increment, losses and changes in standing volume. The regeneration of stands preceded in four different ways – in open areas, under the overstory of reduced closure, in small gaps or continuously when replacing separate dead trees.
    Źródło:
    Sylwan; 2012, 156, 08; 616-626
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zależność wybranych cech drzewostanów od położenia nad poziomem morza na przykładzie Parku Narodowego Gór Stołowych
    Dependence of selected stand characteristics on the elevation on the example of the Stolowe Mountains National Park
    Autorzy:
    Miścicki, S.
    Szneidrowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989003.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    Park Narodowy Gor Stolowych
    dynamika drzewostanu
    miazszosc drzew
    miazszosc drewna
    zasobnosc drzewostanu
    zageszczenie drzew
    przyrost miazszosci
    czynniki siedliska
    wysokosc nad poziomem morza
    current volume increment
    elevation zone
    forest renewal
    net changes in standing volume
    tree density
    Opis:
    The elevation is used to illustrate the differences in the structure and growth of mountain forests. The aim of the study was to determine (1) whether the characteristics used to describe the condition and structure of forest stands under protection status (volume of merchantable timber, tree density, total height of trees in the regeneration layer, volume of dead stems, current annual volume increment, volume of dead trees, periodic changes in standing volume) change at the same rate along with the elevation, and (2) whether in mountains without upper montane zone, the values of the selected characteristics of stands located in the highest elevation zone decrease at a low rate with elevation and are comparable to the stands at the same elevation in higher mountains ranges. The study was located at an elevation of 400−909 m a.s.l. in the Stołowe Mountains National Park (PNGS; SW Poland). We used data from the measurements performed in 2009 and 2014 on 358 permanent sample plots. Plots were assigned to one of five elevation zones of 100 m a.s.l. We assumed that the characteristic value decreased with the increase in the elevation, and that such change was the same for all stand characteristics. This hypothesis was verified using the ANOVA for the repeated samples. The calculations were based on standardized values of the characteristics measured on individual sample plots. The higher above sea level the plot was located, the greater share of spruce in the stand (fig. 1). The standing volume (fig. 2), trees density (fig. 3) and current annual volume increment (fig. 6) decreased with elevation, while the volume of dead stems (fig. 4) increased. The net changes in standing volume (fig. 8) were the smallest in the stands located at the lowest and at the highest zone (400−499 and 800−909 m a.s.l.). No significant relationship was found between the total height of trees in the regeneration layer (fig. 5) or the volume of dead trees in the period 2009−2014 (fig. 7) and the elevation. Individual characteristics differed in the rate of changes of their values with elevation (fig. 9). The structure of stands growing at the highest elevation was the most variable. These stands were rather a substitute for the upper montane zone forests. The rate of the observed decrease of the volume of merchantable timber, tree density and current volume increment in the stands of PNGS was higher than in other forests in the Polish mountains.
    Źródło:
    Sylwan; 2017, 161, 02; 131-141
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ sposobu postępowania z pozostałościami zrębowymi i przygotowania gleby na zrębie na wzrost sosny zwyczajnej (Pinus sylvestris L.) w 6-letniej uprawie
    Effects of logging slash management methods and soil preparation methods on the clear-cut on growth of 6-year-old Scots pine (Pinus sylvestris L.) stand
    Autorzy:
    Żybura, H.
    Aleksandrowicz-Trzcińska, M.
    Drozdowski, S.
    Wołczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/989272.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    zreby
    pozostalosci zrebowe
    postepowanie z pozostalosciami zrebowymi
    przygotowanie gleby
    odnowienia lasu
    odnowienia przez sadzenie
    sosna zwyczajna
    Pinus sylvestris
    uprawy sosnowe
    wzrost roslin
    przezywalnosc
    zageszczenie drzew
    logging slash
    planting
    scots pine
    soil preparation
    Opis:
    Different methods of logging slash management (LSM) and methods of soil preparation (MSP) can create different conditions for the growth of forest trees. This occurs through variation in soil aeration, tree nutrition or microbial conditions. These factors are modified by climate, soil fertility, treats from insects or fungal pathogens and renewed species. The aim of this study was to compare effects of three LSM methods: 1) crushing and mixing with the soil by Mery Crusher, 2) chopping and leaving on the soil surface, and 3) removal from the clear−cut, and three MSP: 1) double−mouldboard forest plough LPz−75, 2) active plough U−162, and 3) forest mill FAO−FAR FV 4088 on biometric parameters, density and survival of six−years old Scots pine seedlings. Field research was conducted in Narol Forest District (south−eastern Poland). The soil in the study area was classified as brown podzolic, formed on loose sands with typical mor humus.The experiment was established by planting 10 000 one−year−old pine seedlings per hectare, after clear cut and followed by a two−factor block design consisting of nine variants distinguished on the basis of LSM and MSP randomly assigned to each of the three blocks. Tree height and root collar diameter were measured three times, at the end of 1st, 3rd and 6th growing season. The results showed no statistically significant differences in the size of the analyzed parameters of planted seedlings. Seedlings in the variant with site preparation by crusher and forest mill were slightly higher and thicker. This indicates the better trophic conditions in that variant. LSM did not affect either seedlings density or their survival. A slightly higher survival rate and tree density occurred in variants with crusher regardless of soil preparation method. It follows that, all presented experimental variants give similar results. Therefore, selection of the most appropriate methods of site and soil preparation should primarily respect ecological and economic indicators, and such local factors as microclimate, mainly precipitation, site fertility and threats from pests and fungal diseases.
    Źródło:
    Sylwan; 2016, 160, 04; 267-276
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wieloletnia dynamika starodrzewów w zagospodarowanej części Puszczy Białowieskiej: gatunki ekspansywne i ustępujące
    Long-term dynamics of old-growth stands in the managed part of the Bialowieza Forest: increasing and declining tree species
    Autorzy:
    Drozdowski, S.
    Brzeziecki, B.
    Żybura, H.
    Żybura, B.
    Gawron, L.
    Buraczyk, W.
    Zajączkowski, J.
    Bolibok, L.
    Szeligowski, H.
    Bielak, K.
    Widawska, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008501.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Puszcza Bialowieska
    starodrzew
    dynamika drzewostanu
    drzewa lesne
    swierk
    grab
    jesion
    olsza
    dab
    lipa
    brzoza
    klon
    sosna
    wiaz
    zageszczenie drzew
    piersnicowe pole przekroju
    piersnice drzew
    gatunki ekspansywne
    gatunki ustepujace
    stale powierzchnie obserwacyjne
    badania dlugoterminowe
    old−growth forest
    permanent plot
    long−term trend
    population density
    population dynamics
    tree species
    Opis:
    In the paper, an assessment of tree population dynamics in the old−growth stands of the managed part of the Białowieża Forest is presented. Data from five permanent sample plots with a total size of 9.3 ha and six inventories that cover the period 1949−2006, were used. Depending on the dynamic status, determined on the basis of changes in a number of individuals per hectare, basal area and quadratic mean diameter, three major groups of tree species were distinguished: 1) an increasing group, containing only hornbeam and lime; 2) a stable group, involving alder and spruce and 3) a declining group consisting of oak, ash, maple, pine, birch, elm and aspen.
    Źródło:
    Sylwan; 2012, 156, 09; 663-671
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wieloletnia dynamika drzewostanów na dawnym zrębie kulisowym w warunkach ochrony ścisłej (Łysica, Góry Świętokrzyskie)
    Long-term dynamics of forest stands on a former narrow strip clear cut under conditions of strict protection (Lysica, the Swietokrzyskie Mountains)
    Autorzy:
    Brzeziecki, B.
    Janicki, S.
    Wiech, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008894.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    parki narodowe
    Swietokrzyski Park Narodowy
    obszary ochrony scislej
    rezerwat Lysica
    stale powierzchnie obserwacyjne
    zrab kulisowy
    drzewostany
    dynamika drzewostanu
    zmiany skladu gatunkowego
    buk zwyczajny
    Fagus sylvatica
    jodla pospolita
    Abies alba
    swierk pospolity
    Picea abies
    klon jawor
    Acer pseudoplatanus
    zageszczenie drzew
    rozwoj drzewostanu
    stand dynamics
    long−term study
    narrow strip clear cut
    european beech
    norway spruce
    silver fir
    sycamore
    strict protection
    Opis:
    Major results of the 45−year−long study on the dynamics of strictly protected forest stands, using 3 permanent study plots, 25×100 m each, located on a former narrow strip clear cut established in the beginning of the 20th century on the northern slopes of the Mt. Łysica (the Świętokrzyskie Mountains, Central Poland) are presented. The general development of forest stands is analysed, including change of overall density, tree mortality rate (general and by species), dynamics of basal area and average tree diameter, competitive ability as well as changing role of particular species (mainly European beech, silver fir, sycamore and Norway spruce) in formation of the general stand structure. The results of the study are compared with other investigations of similar type.
    Źródło:
    Sylwan; 2011, 155, 08; 518-529
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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