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    Wyświetlanie 1-7 z 7
    Tytuł:
    Rębnia przerębowa w drzewostanach sosnowych
    Selection-management in pine stands
    Autorzy:
    Andrzejczyk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018245.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    rebnie
    rebnie przerebowe
    lesnictwo
    scots pine
    pinus sylvestris
    multi−generation
    selection−cutting system
    Opis:
    This study presents the results on the structure and volume of many−aged pine stands in private forest holdings managed under semi−selection system. Their volume was ca 150 m3/ha and the basal area ca 20 m3/ha. Pine stands reveal all−age structure. The conditions of reaching the multi−generation pine stands is poor habitat where pine regeneration shows high competitive ability and density distribution of trees, including the occurrence of gaps and openings in stand overstorey ensuring proper conditions for the appearance and development of new regenerations of pine.
    Źródło:
    Sylwan; 2006, 150, 08; 52-60
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rębnia przerębowa jako nowoczesna metoda biologicznej racjonalizacji
    Selection system as a modern biological rationalisation method
    Autorzy:
    Paluch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018587.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    rebnie przerebowe
    hodowla lasu
    wady
    lesnictwo
    zalety
    selection−cutting system
    stand stability
    reduced costs of treatments
    Opis:
    From the economic point of view, stands managed under selection system are today an interesting alternative to the clearcutting and shelterwood systems. The main advantages of the selection stands is the biological automation of production consisting of the utilisation of the impact of the upper layer trees on the quantitative and qualitative properties of young regeneration and of the lower layer trees (grown under shade), as well as the possibility of limiting tending treatments applied to trees in the youngest development phase resulting in an increase in the average dbh of harvested trees and average unit price of harvested wood.
    Źródło:
    Sylwan; 2006, 150, 10; 20-29
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Etat według potrzeb hodowlanych dla różnowiekowych lasów o strukturze przerębowej lub do niej zbliżonej
    Prescribed yield determined by silvicultural needs for uneven-aged forests with selection or similar structures
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011824.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany roznowiekowe
    gospodarka lesna
    rebnie stopniowe udoskonalone
    przyrost miazszosci
    rebnie przerebowe
    etat wg potrzeb hodowlanych
    lesnictwo
    zapas drewna
    etat rebny
    selection felling system
    improved shelterwood felling system
    prescribed yield according to silvicultural
    needs
    growing stock
    volume increment
    Opis:
    Management activities in uneven−aged forests are based on a prescribed yield subjectively set by an inspector according to silvicultural needs. The findings show that in uneven−aged selection stands prescribed yield was calculated at a lower level than in irregular shelterwood stands. Prescribed yield determined by silvicultural needs differ from actual yield, so it does not meet the actual silvicultural needs of uneven−aged stands and therefore should not be recommended for use in the forest management practice any more.
    Źródło:
    Sylwan; 2009, 153, 03; 158-163
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Podstawy nowoczesnych zasad gospodarowania w różnowiekowych lasach górskich
    The foundations of modern management of uneven-aged mountain forests
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009323.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    drzewostany roznowiekowe
    drzewostany przerebowe
    struktura drzewostanu
    rozklad piersnic
    inwentaryzacja lasu
    gospodarstwa przerebowe
    gospodarstwa przerebowo-zrebowe
    miazszosc drzewostanow
    gospodarka lesna
    postepowanie hodowlane
    uneven−aged forest
    multi−storied forest
    selection system
    dbh distribution types
    uneven−aged forest development stages
    new prescribed cut referring to silviculture needs
    new method of regulation of selection or near−selection forest type development
    Opis:
    In uneven−aged forests, age does not apply to the whole stand but to individual trees. Therefore age of individual trees is rather represented by their thickness, and dbh distribution types become the measure of their age. The distinguished dbh distribution types show individual uneven−aged forest development phases: type A – optimum phase, type B – initial phase, type C – future phase and type D – ageing phase. In the optimum uneven−aged forest development phase, 'prescribed cut according to silviculture needs' should be similar or equal to volume increment. In the initial development phase, such 'prescribed cut' should represent 60−80% of current volume increment, while in the future forest development phase, it should equal the current volume increment or exceed it by 20%. In the ageing forest development phase, 'prescribed cut according to silviculture needs' should be higher than the current volume increment by 10−30%. Selection−type forest management should be a model one for uneven−aged forests. Selection−type forests are close to the natural state and constitute a stable forest ecosystem with high resistance to biotic and abiotic factors and by reducing and dispersing the management risk they better fulfil their multiple functions.
    Źródło:
    Sylwan; 2010, 154, 09; 603-614
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przemiana sposobu zagospodarowania lasu na przerębowy na przykładzie jednostki kontrolnej Chełmsko w Nadleśnictwie Kamienna Góra
    Conversion to selection type of silvicultural system on the example of Chelmsko control unit in the Kamienna Gora Forest District
    Autorzy:
    Barzdajn, W.
    Kowalkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989578.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Sudety
    jodla pospolita
    restytucja gatunku
    drzewostany swierkowe
    przebudowa drzewostanow
    ciecia przerebowe
    powierzchnie probne
    zmiany skladu gatunkowego
    zmiany struktury drzewostanu
    Nadlesnictwo Kamienna Gora
    abies alba
    selection silvicultural system
    the sudety mts.
    Opis:
    The study assesses the effect of applied cuttings on the transformation of the species composition, structure and development of the forest towards selection forest type. The described control unit was established in 2000 in the Krucze Mts. (southern Poland) within the programme of silver fir restoration in the Sudety Mts. The working hypothesis was based on the advantageous effect of the selection management system on fir trees. 46 permanent circular sample plots of 0.05 ha each were established and diameter at breast height measured on all trees along with height of 2−3 trees growing closest to the plot center. Measurements were repeated in 2004 and 2013. The greatest share in the growth increment was recorded for the most numerous species (spruce and fir). Only spruce and beech were important in the group of young trees (recruitment), which did not include fir or larch. The timber resources increased from 339 in 2000 to 381 m³/ha in 2013, which indicates that not whole current increment was harvested. The increase in the growing stock follows the reduction in the number of trees per hectare from 361 to 317. Thus the number of young trees did not compensate for the losses. As a result the investigated unit is not in the state of equilibrium and in the future more work and care should be devoted to the regeneration. Fir turned out to be a species with the greatest production potential. In the first period growing stock of this species amounted to 17%, while the increment was over 26%. In the latter the increment reached 34%. The most important objective of the selection cuttings in this concrete unit should be to tend for regeneration and trees at low diameter sub−classes at the expense of use of trees with target values of diameters at breast height and disturbing the selection cutting structure. It is advisable to increase the share of fir in the structure of analysed unit.
    Źródło:
    Sylwan; 2016, 160, 05; 388-396
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przyrost wartości drzewa jako kryterium regulacji cięć w rębniach złożonych
    Tree value increment as a cutting control criterion in complex cutting systems
    Autorzy:
    Paluch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018656.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    regulacja ciec
    kryteria
    lesnictwo
    rebnie zlozone
    przyrost drzew
    selection stand
    swiss irregular shelterwood cutting system
    target dbh
    regulation
    profitability
    Opis:
    Profitability of the investment related to the leaving of trees of different diameter in a stand was calculated on the basis of present value expressed in money, calculated gross land rent, anticipated end−of−period (EOP) value and knowledge of tree growth rate for an exemplary fir stand. Assuming the break−even point at 1.5% and 3%, a desirable minimum tree increment was established for which leaving of trees in a stand should be considered economically justified. The impact of the assumed level of anticipated profitability on the vertical structure and form of stands managed under the selection and Swiss irregular shelterwood cutting systems was discussed.
    Źródło:
    Sylwan; 2006, 150, 12; 54-63
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka lasów przerębowych w wybranych nadleśnictwach Regionalnej Dyrekcji Lasów Państwowych w Krakowie
    Characteristics of selection stands in selected forest districts of the Cracow Regional Directorate of State Forests
    Autorzy:
    Jaworski, A.
    Paluch, J.
    Pach, M.
    Kołodziej, Z.
    Majerczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1016254.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    sklad gatunkowy
    rozklad piersnic
    Nadlesnictwo Gromnik
    Nadlesnictwo Limanowa
    lasy gorskie
    Karpaty Wschodnie
    struktura wysokosci
    lesnictwo
    zasobnosc drzewostanu
    drzewostany jodlowe
    Nadlesnictwo Stary Sacz
    ciecia przerebowe
    Nadlesnictwo Gorlice
    RDLP Krakow
    Nadlesnictwo Nawojowa
    odnowienia naturalne
    drzewostany przerebowe
    LZD Krynica
    Nadlesnictwo Losie
    selection system
    west carpathians
    natural regeneration
    annual cut
    cutting intensity
    target dbh
    liocourt−meyer distribution
    Opis:
    Research was carried out in 13 fir stands representing a spectrum of typical Carpathian selection forests. In most of them, no selection cutting was applied except for Krynica I and II stands. The stand volume oscillated between 384 m3/ha and nearly 628 m3/ha. The maximum dbh age of the stands ranged from 100−120 to over 200 years. Dbh distributions attained the form of a J−shaped curve with the highest number of trees in the smallest diameter class, however, none of these curves showed conformance with Liocourt−Meyer's theoretical distribution. From the analysis of the undergrowth, it can be concluded that three stands showed unsatisfactory amount of undergrowth. In general, the intensity of cuts in the majority of sites was high. This is related to the specifics of these stands which, in most cases, have not yet been managed under the selection system.
    Źródło:
    Sylwan; 2007, 151, 06; 34-52
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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