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    Tytuł:
    Ceny sprzedaży drewna w użytkowaniu przedrębnym w drzewostanach sosnowych w zależności od ich wieku
    Prices of timber sales in the intermediate harvest in Scots pine stands depending on their age
    Autorzy:
    Mandziuk, A.
    Parzych, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/979471.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    drzewostany sosnowe
    wiek drzewostanu
    uzytkowanie przedrebne
    surowce drzewne
    drewno
    sortymenty drewna
    ceny sprzedazy
    site class index
    timber price
    assortments
    intermediate harvest
    Opis:
    The research concerned the implementation of tasks in the field of harvesting timber in 2008−2012 in pure pine stands aged 10−140. Numerical data from the SILP database were used for calculating the average price of timber in the intermediate harvest. The data on the volume harvested covered late cleaning, early thinning and late thinning. The assortment structure concerned the following groups of large− (WA0, WA1, WB0, WB1, WC0, WC1 and WD), medium− (S10, S11, S2A, S2B, S3A, S3B and S4) as well as small−sized (M1 and M2) assortment groups. The data on the size and value of wood assortments sold across the country concerned the year 2011 and were used to calculate the average price of wood in age subclasses according to the site quality described with site index class. Subsequently, for each site quality class polynomial equations of the trend line was determined and average timber price for each age subclass was calculated for small−, medium− and large−sized assortments. The analysis showed that S2 is the most frequently harvested assortment in the intermediate cuts in Scots pine stands, whose share depending on the site quality class is at the level of 65.7−72.7% of total harvest. The share of small−sized assortments decreases with age in all site quality classes. The opposite tendency is seen for large−sized assortments, whose share decreases with the deterioration of the site quality. Fraction of medium−sized assortments reaches its peak at the age of ca 45 in IA site index class and the shift in the peak with age is associated with the deterioration of the site quality. The higher the site quality, the higher the prices of assortments in the intermediate harvest. This trend occurs in all age subclasses.
    Źródło:
    Sylwan; 2019, 163, 11; 883-891
    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:
    Wpływ zasobności drzewostanów sosnowych na ustalanie ekonomicznego wieku dojrzałości rębnej
    Impact of Scots pine stand growing stock on determining the optimal economic rotation age
    Autorzy:
    Parzych, S.
    Mandziuk, A.
    Wysocka-Fijorek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/986601.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    gospodarka lesna
    drzewostany sosnowe
    zasobnosc drzewostanu
    wiek dojrzalosci rebnej
    optymalizacja
    klasy bonitacji
    timber price
    rotation age
    optimization methods timber production
    site class index
    Opis:
    The stand volume is one of the forest inventory characteristic determined during the field work aimed at planning operations in the tree stands. Determining the optimal rotation age is an important decision issue in the forest management. In turn, the key factor that determines the choice of the method for determining the rotation age of the tree stands is the production target. Depending on the rotation age, a specific structure of quantity, quality and dimensions of particular timber assortments is obtained. It seems reasonable that the economic rotation age is one of the main criteria taken into account when planning forest management in tree stands or forest district. The aim of the paper is to assess the impact of growing stock on determining the rotation age of Scots pine stands in particular site index classes. We compared the tabular (i.e. based on data from yield tables) and real (i.e. based on data from the Information System of the State Forests) volume of pine stands. The analysis was based on the forest description data, the amount of the harvested timber and economic data: timber price as well as the costs of harvesting, skidding and production of assortments. The optimal economic rotation age was determined as the point of intersection of the curve describing the average and current increment of the value of Scots pine stands. The research showed that the rotation age of stands is related to the site index class and whether real or tabular results are analysed. The optimal rotation age for Scots pine tree stands is lower in the real data model from 10 to 23 years from that calculated on the basis of tabular data.
    Źródło:
    Sylwan; 2018, 162, 08; 671-678
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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