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    Wyświetlanie 1-9 z 9
    Tytuł:
    Problematyka przebudowy w urządzaniu lasu
    Problems of conversion in forest management
    Autorzy:
    Miś, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018670.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    przebudowa drzewostanow
    lesnictwo
    urzadzanie lasu
    forest conversion
    regulation
    group clear cutting system
    Opis:
    The paper presents a description of the concept of a forest regulation method in the forest conversion system and a comparative analysis of its features as exemplified by the Siemianice Experimental Forest Range, Zielonka Experimental Forest Range and Łopuchówko Forest Range, Kąty working circle. In addition, the study also offers detailed data concerning the method of realisation of the mature pine stand reconstruction by a group clear cutting system performed on the experimental surface in the Podanin Forest District and the results obtained after 20 years.
    Źródło:
    Sylwan; 2006, 150, 12; 12-26
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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:
    Struktura sortymentowa pozyskiwanego drewna w podklasach wieku w wybranych rodzajach rębni w drzewostanach sosnowych
    Assortment structure of harvested wood in age subclasses in selected cutting systems in Scots pine stands
    Autorzy:
    Parzych, S.
    Mandziuk, A.
    Wysocka-Fijorek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/980187.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    drzewostany sosnowe
    rebnie
    sosna zwyczajna
    Pinus sylvestris
    pozyskiwanie drewna
    struktura sortymentowa
    management system
    cutting system
    assortment of wood
    scots pine
    Opis:
    Scots pine is the dominant forest tree species in Poland covering 58.0% of the forest area and constituting 61.1% of timber resources. Theoretically, all types of cuttings can be used in pine stands, but the purpose of the paper is to analyse the share of the main groups of assortments obtained from such stands with the use of: clear, group and gradual cuttings. It should be remembered that all types and forms of cutting are ideological, and the choice of a particular system should be determined by the silviculture goal. We used the data from the years 2012−2014 to conduct the research. The analysis covered Scots pine stands from all forest districts of the State Forests National Forest Holding, in which this species had a share of 80 to 100%. We analysed clear (I), group (III) and gradual (IV) cutting systems. Over 3.1 million hectares of mono−species pine stands was analysed. Numerical data was obtained from the database of the State Forests Information System. The studies took into account the assortments that actually occurred in a given subclass of age, divided into the type of cuttings, aggregated into three categories: small, medium and large−sized timber. In Poland, in mono−species Scots pine stands, mainly I and III cutting systems (about 97% of analysed stands) were used, the remaining types of treatments were sporadic. The largest share of harvest was characterized by the pulpwood assortment in harvesting I and III and the sawmill wood in the IV cutting system. With age, a decrease in the proportion of small−sized assortments and a gradual increase in the share of large−sized assortments was observed, while in the case of medium−sized assortments, the culmination of the share occurs at the age of 35−45 years, in all the analysed cutting systems. The course of the fraction of sub−classes in the case of large and medium−sized assortments in I and III cutting systems was similar.
    Źródło:
    Sylwan; 2019, 163, 09; 707-715
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena rębni gniazdowej na podstawie drzewostanów uszkodzonych w lasach nizinnych Polski
    Evaluation of the group cutting system on the basis of damaged forests in lowland Poland
    Autorzy:
    Łukaszewicz, J.
    Niemczyk, M.
    Dmyterko, E.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/989687.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    przebudowa drzewostanow
    rebnie gniazdowe
    rebnie czesciowe gniazdowe
    drzewostany nizinne
    uszkodzenia drzewostanow
    czynniki abiotyczne
    czynniki biotyczne
    group cutting system
    sawtimber stand
    demaged stand
    Opis:
    The paper compares the proportion of damaged stands managed under group cutting system (group clear cutting and group shelterwood cutting) with the analogous stands where cuts had not been performed. The empirical material came from the database of the State Forests Information System and covered all forest districts located in Polish lowlands. To evaluate the group cutting a test of differences between the fractions of the elements distinguished in the population was used. The first population involved sawtimber stands in which no group cuts had been performed in the past decade. The number of damaged stands was determined for this population and their percentage share was established. A similar procedure was applied to the second population of stands in which the group cutting was employed. A damaged stand was assumed to be one in which the volume of windbroken and windfallen trees and deadwood harvested in the past 10 years exceeded the volume set in the given formula (1). The performed analysis shows that after several years, the proportion of damaged stands in which gaps were established is significantly higher (57.2%) than in the stands without cut patches (32.9%). Stands with patches demonstrate a significant, statistically greater susceptibility to damage from abiotic and biotic factors. The proportion of damaged stands managed under the group shelterwood cutting (60%) is larger than that under the group clear cutting (55.4%). Spruce is the most vulnerable to damage, while alder − the least vulnerable. On average, the higher proportion of damaged forests, mainly pine and oak forests is in the territory of the Bialystok Regional Directorate of the State Forests (RDSF) (tab. 2) being lower in the territory of the Warsaw RDSF where damaged pine stands are more frequent (tab. 3). In areas with a high probability of damage to stands group cut should be limited, and in spruce stands – totally abandoned. Time regimes should also be established applying the group cutting by shortening the period of reconstruction of the entire forest stand.
    Źródło:
    Sylwan; 2015, 159, 01; 3-12
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ czynników otoczenia na przeżywanie i ubywanie drzewostanów w klasach wieku w przerębowo−zrębowym sposobie zagospodarowania
    The impact of natural and economic factors on the survival and decline of stands in age classes in selection-clear cutting system of forest economy
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012947.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    gospodarstwa przerebowo-zrebowe
    klasy wieku
    kleski zywiolowe
    czynniki biotyczne
    proces ubywania
    lesnictwo
    czynniki decyzyjne
    czynniki abiotyczne
    urzadzanie lasu
    czynniki losowe
    proces przezywania
    factors of the natural and economic environment
    harvest plan
    survival and removal of stands
    age class
    partial cutting system
    Opis:
    The impact of natural and economic factors on the survival and decline of stands by age class was examined in 30 forest stands under a selection−clear cutting system. The results point to economic reasons, particularly a forester's decisions, as factors restraining or allowing unscheduled final cuts. Regeneration of stands is often initiated by unscheduled cuts, particularly by incidental sanitation felling. No final felling is performed in stands under regeneration with scheduled cuts concurrently restrained.
    Źródło:
    Sylwan; 2008, 152, 04; 30-37
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ warunków siedliskowych na zróżnicowanie wysokości dębu na gniazdach
    Effect of habitat conditions on the variation of oak height in the gaps
    Autorzy:
    Andrzejczyk, T.
    Bolibok, L.
    Buraczyk, W.
    Drozdowski, S.
    Szeligowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/991003.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    rebnie zupelne gniazdowe
    hodowla lasu
    odnowienia lasu
    odnowienia na gniazdach
    drzewa lesne
    dab szypulkowy
    Quercus robur
    wzrost roslin
    warunki siedliska
    siedliska lesne
    bor mieszany swiezy
    las mieszany swiezy
    las swiezy
    pedunculate oak
    clear−cut gap
    plantations
    forest regeneration
    patch cutting system
    Opis:
    The paper presents the study on the height of 10−12−year−old pedunculate oak regeneration in clear−cut gaps in three fertility variants: mezotrophic of poorer productivity (fresh mixed coniferous forest – BMśw), mezotrophic of higher productivity (fresh mixed deciduous forest – LMśw) and eutrophic (fresh deciduous forest – Lśw). BMśw and LMśw were represented by two locations: Gostynin (G) and Parczew (P), while Lśw – by one: Czarna Białostocka (CzB). We analysed the variation of oak height in the patches along the north−south (N−S) and east−west (E−W) gap axes. In each location 3−5 gaps were selected and measurements taken on three transects along the N−S axis located in the western (W), central (C) and eastern (E) part. Significant differences in oak height were found along the N−S axis. Oaks in the BMśw and LMśw habitats in the south−central part, and those in the Lśw habitat in the centre−northern part of the patch were the highest. The height growth of oaks on sandy soils (BMśw, LMśw) was found to be limited by moisture deficit, while on loamy soils (Lśw) – by light deficiency. The differences in oak height along the E−W axis were smaller and less apparent, indicating a tendency towards the reduction of their height growth in the central part of the gap.
    Źródło:
    Sylwan; 2014, 158, 06; 404-413
    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 1-9 z 9

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