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    Wyświetlanie 1-10 z 10
    Tytuł:
    Litter-fall and humus accumulation in thinning experiment Kristianov in the Jizerske Hory Mts.
    Autorzy:
    Novak, J.
    Slodicak, M.
    Dusek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/38641.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    litter fall
    humus accumulation
    thinning
    Izerskie Mountains
    Picea abies
    Norway spruce
    nutrient cycle
    tree stand
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2010, 52, 2
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The damage caused by wind in middle-aged Scots pine stands on permanent thinning experimental plots
    Autorzy:
    Zachara, Tadeusz
    Gil, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2040918.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    Pinus sylvestris
    silviculture
    windbreak
    Opis:
    In July 2002, the very strong hurricane appeared in northern Poland, which caused destruction of forest cover of area more than 10,000 ha. The permanent thinning research plot in a 53-year-old pine stand located in Myszyniec forest district (150 km north of Warsaw) was lying on the edge of damaged area. The following treatments were tested on this plot: 1) control plot (without thinning); 2) schematic cut in 20-year-old stand, selective thinning to 40 years, then thinning from below; 3) schematic cut in 20-year-old stand, then selective thinning; 4) selective thinning in young stand (20–40 years), then thinning from below and 5) selective thinning all the time. A significant part of this plot was completely destroyed and in the other part of the plot, some trees survived. A small part of the plot resisted the wind attack. An analysis of the amount of destroyed trees (measured by basal area) showed no differences between particular silvicultural treatments. The level of damage differed between particular parts of the plot. Another plot located in Ostrów Mazowiecka forest district (100 km NE of Warsaw) with the same thinning treatments was touched by heavy wind in July 2011 when the stand was 62 years old. Unlike the hurricane of 2002, this storm did not destroy the experimental plot which was located outside the zone of heaviest calamity. Therefore, damage on this plot had point and group character. Although on particular measurement units, share of broken or fallen trees did not exceed 10% of total basal area, it can be observed that the lowest level of damage was noticed on plots with selective thinning in young age and thinning from below in older stand.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 4; 300-307
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ metod trzebieży na wskaźniki przewagi konkurencyjnej drzew dorodnych w jednowiekowych drzewostanach sosnowych II i III klasy wieku
    The influence of different thinning methods on dominance coefficients of future crop trees in even-aged Scots pine stands
    Autorzy:
    Zachara, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1316012.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewostany sosnowe
    drzewostany jednowiekowe
    klasy wieku
    drzewostany II klasy wieku
    drzewostany III klasy wieku
    trzebieze
    sosna zwyczajna
    Pinus sylvestris
    drzewa dorodne
    cechy biometryczne
    wskazniki przewagi konkurencyjnej
    Scots pine
    permanent experimental plots
    dominance coefficients
    thinning intensity
    Opis:
    The research aim was to evaluate the influence of different thinning methods on future crop tree growth. Investigations were conducted on permanent Scots-pine experimental plots, established in 1960s and 1970s in Kozienice, Łąck, Parciaki and Janów Lubelski Forest Districts. To assess the response to thinning of future crop trees, their dominance coefficients were used. These are defined as quotients for each given future crop tree diameter and average stand diameter (WP1), the average dominant layer diameter (WP2) and the average diameter of 100 thickest trees per hectare (WP3). The difference between each coefficient value at the beginning and at the end of the measurement period was used as a measure of the thinning effect. On Kozienice, Łąck and Parciaki plots the differences between treatments were significant, especially in the period after first thinning. The increase of WP3 coefficient occurred in a case of strong thinning – TS1 and TS2. On plot Parciaki also the moderate thinning TU1 and TU2 had a significant influence on change of this coefficient. On plot Janów Lubelski the influence of treatment has not been stated in the first 5-year period but in the next one. Analyses of changes in the dominance coefficients confirmed the hypothesis that the WP3 coefficient is very useful as it is the most stable indicator of future crop-tree position in a stand. On Kozienice, Łąck and Parciaki plots the significant differences between treatments were stated, especially in the period after first thinning. The influence of thinning treatment on the plot Janów Lubelski was not considered for the first 5-year period but in the next one. All reactions to thinning were slower on this plot, possibly because of the relatively poor site conditions. This was a longterm effect. The results obtained suggest that very intense thinning of Scots pine stands should only be implemented under a restricted set of conditions – in healthy, not neglected, forest stands. Classical moderately-selective thinning is preferable to intense thinning and is the most convenient option for pine stands.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 1; 31-45
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zywotnosc korzeni w wierzchnich warstwach gleby w drzewostanach sosnowych w 10 lat po trzebiezy
    Root vitality in the upper soil of pine stands ten years after thinning
    Autorzy:
    Farfal, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/45985.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewostany sosnowe
    trzebieze
    gleby lesne
    warstwa wierzchnia
    korzenie
    zywotnosc
    gestosc korzeni
    Źródło:
    Leśne Prace Badawcze; 2010, 71, 3; 225-230
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przyrosty drzew uszkodzonych przy pozyskiwaniu drewna w drzewostanach sosnowych w trzebiezach poznych
    Increments in trees injured during late thinning in pine stands
    Autorzy:
    Suwala, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/45628.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    drzewostany sosnowe
    uszkodzenia drzew
    uszkodzenia mechaniczne
    trzebiez pozna
    przyrost miazszosci
    drzewa uszkodzone
    sosna zwyczajna
    lesnictwo
    przyrost drzew
    Pinus sylvestris
    drzewa lesne
    pozyskiwanie drewna
    Źródło:
    Leśne Prace Badawcze; 2008, 69, 2; 101-108
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thinning effects on stand formation and modifications of a young pine/birch forest: a boreal zone case study
    Autorzy:
    Nakvasina, Elena Nikolaevna
    Voevodkina, Alexandra Viktorovna
    Volkov, Alexey Gennadievich
    Zakharov, Andrey Yurievich
    Koptev, Sergey Viktorovich
    Minin, Nicolai Stepanovich
    Powiązania:
    https://bibliotekanauki.pl/articles/2042461.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    strip cutting method
    boreal forest
    ecological interactions
    forest understory vegetation
    soil properties
    Opis:
    Thinning of young forests attracts the attention of scientists despite the long-term commercial effect. However, these researches are scarce. Therefore, it is important to study experiments with a long history. The aim of our study is to investigate the impact of thinning carried out in young pine/birch boreal forests on stand formation, natural regeneration, ground cover and properties of the soil layers in stands. We investigated three types of thinning in young pine/birch forests. In one plot of the initial stand, thinning was performed in two stages with a time interval of 27 years; in the first stage, thinning intensity was 75% of stems, while in the second stage, thinning intensity was 30%. In two other plots, thinning was performed in one stage at a stand age of 13 years, with thinning intensities of 76 and 84%. At the stand age of 72 years (2017), integrated studies of the silvicultural and ecological states were carried out. All thinned plots had developed into pure pine stands with 28–53% thicker stems, 12–18% higher trees and a growing stock 55–92% higher compared to the un-thinned reference stand. The most pronounced differences were observed for Option 1. With thinning, forest type changed to red whortleberry type, while the un-thinned reference site developed into a blueberry type forest. Thinning in young pine/birch stands results in the formation of pure pine stands. The associated modification of environmental properties changed the composition and density of the ground cover and some properties of the upper soil layers. Two-stage thinning had the least impacts; this approach can be used to produce stands with high commercial value. It is especially recommended for young pine/birch forests in the northern taiga.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2019, 61, 3; 197-210
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zakres wykorzystania pnia i jakość sortymentów pozyskanych harwesterem w drzewostanie sosnowym II klasy wieku
    Harvester efficiency in trunk utilisation and log quality of early thinning pine trees
    Autorzy:
    Mederski, P.S.
    Werk, K.
    Bembenek, M.
    Karaszewski, Z.
    Brunka, M.
    Naparty, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/46450.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    pozyskiwanie maszynowe
    harwestery
    harwester Vimek 404 T5
    dokladnosc przerzynki
    jakosc okrzesywania
    drzewostany sosnowe
    drzewostany II klasy wieku
    sosna zwyczajna
    Pinus sylvestris
    wyrob sortymentow
    sortymenty drewna
    jakosc drewna
    Źródło:
    Leśne Prace Badawcze; 2019, 80, 1
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wykonania szlaków operacyjnych na wartość hodowlaną jednowiekowych drzewostanów sosnowych przy różnych metodach trzebieży
    The influence of the establishment of skid trails on the silvicultural quality of even-aged Scots pine stands in different thinning treatments
    Autorzy:
    Zachara, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/29519606.pdf
    Data publikacji:
    2023-11-23
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    silviculture
    Scots pine
    future crop trees
    tending cuts
    skid trails
    hodowla lasu
    sosna zwyczajna
    drzewa dorodne
    cięcia pielęgnacyjne
    szlaki operacyjne
    Opis:
    The study was conducted on a permanent experimental plot established in 1965 in the Kozienice Forest District to investigate the effects of spacing on the growth of Scots pine. Since 1999, the plot has also been used to study the effects of thinning - using a randomized block design. In this study, seven treatments (four blocks) out of a total of nine treatments present on the plot were included. The following treatments were tested: (1) moderate selective thinning TU1 and TU2 (focusing on 500 future crop trees per hectare evenly distributed on the plot), (2) group thinning TG1 and TG2 (focusing on the same number of future crop trees not evenly distributed on the plot), (3) heavy thinning TS1 and TS2 (focusing on 350 future crop trees per hectare), and (4) control plot (K, without thinning). During the last thinning, a network of skid trail s (each 17-18 m) was established in the study plot to enable the use of a harvester. The aim of the study was to evaluate the influence of the establishment of skid trails on the loss of future crop trees in different treatments. All trees removed in the period 2015-2020 (including natural mortality and mortality caused by the establishment of skid trails) were counted and their basal area calculated. ANOVA was performed to investigate the influence of thinning treatments on natural and artificial loss of trees between successive thinnings. The largest total number and basal area of trees removed was found in control plot K. The greatest loss of future crop trees was observed in the plots treated with group thinning TG1. In plots with a lower number of future crop trees (TS1), the loss was zero. In summary, the establishment of skid trails in heavily thinned Scots pine stands with wide spacing is acceptable. The skid trails should be established before the selection of future crop trees.
    Źródło:
    Leśne Prace Badawcze; 2023, 83; 51-56
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czy naturalne procesy ekologiczne w juwenilnej fazie rozwoju drzewostanu założonego sztucznie różnicują jego strukturę przestrzenną?
    Do natural processes at the juvenile stage of stand development differentiate the spatial structure of trees in artificially established forest stands?
    Autorzy:
    Szmyt, J.
    Korzeniewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1317220.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    ekologia lasu
    drzewostany sosnowe
    drzewostany debowe
    wiezba poczatkowa
    procesy ekologiczne
    wydzielanie sie drzew
    drzewa lesne
    sosna
    dab
    rozmieszczenie drzew w przestrzeni
    piersnice drzew
    wysokosc drzew
    dlugosc korony
    spatial indices
    forest diversity
    self-thinning
    managed forests
    Opis:
    Structural diversity is one of the most interesting phenomena that have been studied by forest ecologists and practitioners. Amongst the different characteristics of forest structure, spatial diversity of trees and their attributes seem to be very important. The more spatially structured a population is, the higher its diversity in terms of size and species richness. Because most forests in Europe are managed and were artificially established, they are subjected to conversion processes turning them into more complex systems. The approach presented here aims at elucidating whether natural processes, such as self-thinning, can cause the self-differentiation of spatial structure in artificially planted stands. Our analyses focused on untended Scots pine and pedunculate oak stands in the juvenile phase of development and were based on spatially explicit structural indices for positioning and size differentiation (diameter, total height and crown length). The obtained results indicate that live trees were dispersed more or less regularly. Unlike the anglebased index, which mostly indicated randomness in tree location, a distance-based index showed clear regularity. We also found that the distribution of tree attributes auto-correlates to tree location as indicated by significantly lower index values compared to values resulting from random reassignment of the examined attributes. This low degree of spatial differentiation is further confirmed by the distribution of indices in differentiation classes. Our results allow us to conclude that, in the case of light demanding species (pine and oak), natural processes do not increase spatial diversity of the stand, although, both species showed a certain degree of deviation in this respect.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 2; 171-179
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efektywność pozyskiwania drewna harwesterem w młodszych trzebieżowych drzewostanach sosnowych w zależności od technologii pracy
    Efficiency of timber harvesting using harvester in thinned young pine stands as a function of working technique
    Autorzy:
    Stańczykiewicz, Arkadiusz
    Szewczyk, Grzegorz
    Brzoza, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/18055686.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    metoda drewna krótkiego z międzypolem
    trzebieże wczesne
    pozyskanie ręczno-maszynowe
    pozyskanie maszynowe częściowo zautomatyzowane
    wydajność pracy
    czasochłonność pracy
    CTL method with midfield
    early thinning
    motor-manual logging
    semi-automated logging
    work efficiency
    worktime consumption
    Opis:
    In Poland, more and more timber is harvested with the use of harvesters of different types. These machines can also be used in cooperation with chainsaw operators, e.g. in stands damaged by violent winds, in the removal of windthrows, or in stands of younger age classes in the technological variant with the so-called „midfield”. The aim of the study was to characterise the working time structure and to estimate the efficiency of timber harvesting with a harvester in two technological variants. In the first variant, the felling of trees was carried out by a chainsaw operator and the processing was performed by a harvester operator. In the second variant all operations were carried out by a harvester operator. In both variants, the machine worked on the skid trails, but in the second variant, the operator descended from the skid trails a short distance into the stand. Harvesting was conducted in two pine stands that were approximately the same age and differed in site conditions. The structure of the harvester operator's work time was clearly dominated by the moving of felled trees to the skid trails in both variants. Of all the activities studied, the observed differences between their durations in both variants were insignificant only in the case of delimbing and bucking (processing). In the case of cooperation between harvester operator and chainsaw operator, a higher work efficiency was achieved than in the case of timber harvesting with a harvester alone. At the same time, significantly lower work time consumption was observed. However, when considering the efficiency of the entire technologies, thinning with two workers was 30-60% more time consuming. Significant relationships were found between the amount of merchantable timber of harvested trees and the efficiency of the harvester operator.
    Źródło:
    Leśne Prace Badawcze; 2023, 83; 16-24
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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