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    Wyświetlanie 1-6 z 6
    Tytuł:
    Model optymalizacji struktury sortymentowej pozyskiwanego drewna w przedsiębiorstwie leśnym
    Model optimalizacii sortimentnojj struktury zagotovlivaemojj drevesiny v lesnom prodprijatii
    Optimalization model of assortment structure of forest interprice
    Autorzy:
    Klapec, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/816882.pdf
    Data publikacji:
    1988
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    nadlesnictwa
    pozyskiwanie drewna
    struktura sortymentowa
    optymalizacja
    Źródło:
    Sylwan; 1988, 132, 05
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody określania struktury sortymentowej drzewostanów i ich wstępna ocena
    Autorzy:
    Bruchwald, A.
    Kłapeć, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1022044.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    struktura sortymentowa
    drzewostany
    miazszosc drzewostanow
    lesnictwo
    struktura drzewostanu
    assortment structure
    volume measurement methods
    analysis of methods
    Opis:
    Assortment volume determination in the forest district can be carried out with three methods based on individual tree, whole stand, and management division. The paper presents detailed characteristic and opportunity of the practical use of these methods. The authors conclude that application of the particular method depends on assumed aim and required accuracy.
    Źródło:
    Sylwan; 2005, 149, 10; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza porównawcza struktury sortymentowej drewna po stronie planu oraz jego wykonania na poziomie nadleśnictwa
    Comparative analysis of timber assortment structure in the logging plan and its realisation at the level of the forest district
    Autorzy:
    Bruchwald, A.
    Kłapeć, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018507.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    struktura sortymentowa
    nadlesnictwa
    plan pozyskiwania drewna
    drewno okragle
    lesnictwo
    szacunek brakarski
    pozyskiwanie drewna
    assortment structure
    database use
    logging plans
    Opis:
    Attempts to apply the proper method of grading estimations that would result in working out a good logging plan have been made for many years. Comparison of share of assortment groups in annual logging plan with its realisation usually shows significant differences. Presented research results from 3 forest districts prove the need of working out a new planning method that would widely utilise data on logging realisation which exist in computer databases of forest districts.
    Źródło:
    Sylwan; 2006, 150, 05; 24-29
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany struktury sortymentowej drzewostanów sosnowych I bonitacji w Nadleśnictwie Pisz
    Changes of assortment structure of Scots pine stands of Ist site index class in Pisz Forest District
    Autorzy:
    Lewandowska, M.
    Stępień, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/991719.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Nadlesnictwo Pisz
    drzewostany sosnowe
    drzewostany I bonitacji
    struktura sortymentowa
    wiek drzewostanu
    sortymenty drewna
    assortment structure
    aging process
    changes
    homologous series of stands
    Opis:
    In spite of the growing importance of the protective and social functions of forests, their productive function, including production of raw wood with a diversified assortment structure, is still prominent. Changes in the assortment structure depend to a large extent on tree species, habitat conditions and intensity of tending treatments. However, for the temporal organization of forest management, it is essential to recognize the dynamics of these changes in relation to stand age. The paper contains an analysis of quantitative and qualitative changes in the assortment structure of the Ist site index pine stands in the Wilcze Bagno Forest Compartment (Pisz Forest District), depending on the length of the primary production of standing timber. Data from 10 forest stands similar in terms of habitat, stand density and anagement treatments were taken for analysis. These stands form a homologous series ranging in age between 40 and 130 years.
    Źródło:
    Sylwan; 2013, 157, 06; 412-418
    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:
    Rynek drzewnego surowca brzozowego w Polsce w latach 2008-2012
    Silver birch timber market in Poland in 2008-2012
    Autorzy:
    Lachowicz, H.
    Wysocka-Fijorek, E.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989465.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    brzoza brodawkowata
    Betula pendula
    surowce drzewne
    drewno brzozowe
    struktura sortymentowa
    podaz
    ceny
    rynek drzewny
    analiza rynku
    lata 2008-2012
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    silver birch
    timber market
    sales of timber
    wood prices
    Opis:
    The article presents an analysis of the birch market in Poland in 2008−2012, including the acquisition (supply) of birch wood, the income structure, prices of birch wood, the structure of birch wood recipients and the volume of purchased timber. The necessary materials were obtained from the Forest Data Bank (BDL) and the State Forests Information System (SILP). The S2 wood assortment representing more than 54% of all assortment groups is most often harvested in Poland. Next come M1 representing 14%, as well as S4 and WC – each with share slightly exceeding 11%. The vast majority of the harvested and handled birch wood is in the group of medium−sized assortments S representing 66%, and in the group of small−sized assortments M representing 14%. Birch wood classified as large−sized W totals 20%. Similarly, timber assortments from group S2 also generate the largest portion of revenues (over 50% of total revenues from birch wood sales). High fluctuations in the prices of certain groups of birch wood assortments constitute a significant problem from the point of view of both the State Forests and wood consumers. A possible reduction in the supply of wood of this species in the future may deepen this phenomenon. Average sales prices of birch wood on the Polish market are lower than the prices obtained by timber producers in the neighbouring countries. The price differences in favour of foreign timber producers reach up to 20% and relate to roundwood in different quality and size classes. The exceptionally high technical quality of birch wood in our country does not translate to higher prices per cubic meter of raw timber in the domestic turnover. The sharp increase in the demand for a special type of fibres for the manufacture of many products characterized by exceptional strength (i.e. products from polymers) and textiles with special insulating properties, as well as the production of certain grades of paper and board, will stimulate the consumption of birch wood in the future.
    Źródło:
    Sylwan; 2016, 160, 12; 971-980
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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