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    Wyświetlanie 1-9 z 9
    Tytuł:
    Wartość zasobów drzewnych wybranych drzewostanów bukowych i jodłowych w Beskidach
    Timber value of selected beech and fir stands in the Beskidy Mountains
    Autorzy:
    Zygmunt, R.
    Banas, J.
    Bujoczek, L.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/985876.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Beskidy
    drzewostany bukowe
    drzewostany jodlowe
    zasobnosc drzewostanu
    System Informatyczny Lasow Panstwowych
    zasoby drzewne
    wartosc pieniezna
    wartosc sprzedazy
    wartosc lasu
    monetary value tariff
    inventory of wood resources
    Opis:
    The paper presents assessment of the value of selected beech and fir stands by the classic method and using the value tariff in two ways. The aim of the work was to verify the suitability of the local tariff method based on the SILP forest database for the valuation of timber resources in forests. The measurements were carried out in the Beskidy Mountains (southern Poland). The reference sales value of the beech and fir stands with the growing stock from 61 to 643 m3/ha ranged from 6,307 to 102,438 PLN/ha. The average value of stands is about 45,000 PLN/ha and the standard deviation around 20,000 PLN/ha, with an average volume of 340 m3/ha and standard deviation of 140 m3/ha. The monetary value of the uneven−aged fir and beech stands calculated by the mean of the local tariff of value (method 1) was different from the values calculated either basing on the traditional method or on the method 2. However, the difference was on average 11% when it came to the previous, and about 2.2% when for the latter method. Almost 50% of the stands were valuated using the second method with an error of ±2.5%, the maximum extreme negative error being –14% and the maximum extreme positive error being +11%. As soon as the calculation process were automatised, the present method to obtain the local monetary value tariff of forest resources could become a practical tool in the process of forest resources valuation for the needs of the State Forests and as such it could replace the so−far used stand value tables.
    Źródło:
    Sylwan; 2018, 162, 09; 718-726
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Taryfa wartości pieniężnej zasobów drzewnych na pniu utworzona z wykorzystaniem baz danych o lasach
    Monetary value tariff of timber calculated using databases of forests
    Autorzy:
    Zygmunt, R.
    Banaś, J.
    Bujoczek, L.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989008.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany
    zasoby drzewne
    zasoby drzewne na pniu
    wycena
    wartosc pieniezna
    System Informatyczny Lasow Panstwowych
    inwentaryzacja zasobow drzewnych
    timber valuation
    monetary value
    inventory of wood resources
    Opis:
    This paper presents the method worked out to assess the value of growing stock in an exemplary forest district basing on the stand−level data available from the forest inventory databases. The method was designed for European beech and silver fir growing in the Polish part of the Carpathian Mountains. Sample data includes 28 stands, where quality classes of wood were assessed for 18,000 trees altogether. Beech and fir timber prices from the transactions made in 2010−2012 and harvesting/processing costs were also included in the analysis. The proposed tariff consists of calculating the growing stock value basing on taxation features of the stands, which are described in the forest management plan as well as on local wood stock prices. The local tariffs of wood stock prices for beech and fir were calculated as a set of functions, where the diameter at breast height (DBH) is the descriptive variable. The local tariff for beech with DBH in the range of 7−22.5 cm equals approximately 89.6 PLN/m³, while for DBH in the range of 22.5−50.9 cm is described by the equation: y=–0.011·DBH²+1.9539·DBH+51,305. The local tariff for fir wood with DBH in the range of 7−18 cm amounts approximately to 99 PLN/m³, while for DBH in the range of 18−54.2 cm is described by the equation: y=0.0027·DBH³–0.3555·DBH²+15.992·DBH–80.186. The initial verification of the valuation results obtained by means of this method turned out to be positive. As the next stage, the presented method should be verified for the same stands with use of several methods, e.g. quality classes of wood and calculating the value of the cut wood and calculating valuation errors.
    Źródło:
    Sylwan; 2017, 161, 02; 91-100
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określenia zasobności na poziomie warstw gatunkowo-wiekowych w obrębowej metodzie inwentaryzacji
    Accuracy of volume determination on the level of age-species layers in the stratified sampling method
    Autorzy:
    Banaś, J.
    Drozd, M.
    Bujoczek, L.
    Zięba, S.
    Zygmunt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/986687.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    powierzchnie probne
    forest inventory
    stratification
    standard error
    sample plot
    variability coefficient
    lesnictwo
    drzewostany swierkowe
    warstwy gatunkowo-wiekowe
    inwentaryzacja lasu
    zasobnosc drzewostanu
    miazszosc drzewostanow
    metoda obrebowa
    dokladnosc pomiaru
    Opis:
    Statistical representative method of inventory based on stratified sampling is used for elaborate forest management plans in Poland. Strata are created according to the dominant tree species and age of stands. First stratum include stands with age from 21 to 30 years and the interval in the next strata is 10 years. Sample plot size depends on stand age and varies from 0.005 to 0.05 ha. According to the allocation pattern number of samples is proportional to age and total area of stands in a stratum. Diversification of number and size of sample plots has a profound influence of inventory precision in an age classes. The aim of the study is to analyse the accuracy of the stand volume determination on the level of age−species strata. Research was conducted based on the data obtained from periodic forest inventory in seven mountainous forest subdistricts located in the Kłodzko Basin (SW Poland). Norway spruce stands with total area of 39,935.45 ha and 6102 sample plots were chosen for analysis. Sampling fraction, mean number and volume of trees on a sample plot, coefficient of volume variability and standard error of volume were calculated for each stratum in analyzed forest subdistricts. Sample plots with size of 0.005 ha established in young stands (21−30 years) are characterized by small number of trees (4.3−7.6 in average) and the highest coefficient of volume variability (93%). Additionally, because of low age of stands, the number of plots is also small (18 on average), which influences the low precision of volume inventory in this stratum. Standard error of volume was on the mean level of 23% in the youngest age stratum and decreased with age of stands to 5% in the stands of 41−71 years and below this level in the strata with the older stands. Increasing the plot size in the youngest stratum will be effective way to improve accuracy of forest inventory in the method based on stratified sampling.
    Źródło:
    Sylwan; 2017, 161, 09; 715-722
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda określania średniego wieku gospodarstwa w przerębowo-zrębowym sposobie zagospodarowania lasu
    Method of assessment average age of forest range in shelter wood cutting system
    Autorzy:
    Banaś, J.
    Zięba, S.
    Bujoczek, L.
    Zygmunt, R.
    Drozd, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989920.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    gospodarstwa lesne
    gospodarstwa przerebowo-zrebowe
    drzewostany
    struktura drzewostanu
    struktura wiekowa
    klasy wieku
    sredni wiek drzewostanu
    wiek odnowienia
    odnowienia podokapowe
    age class structure
    average age of stands
    regeneration class
    upgrowth
    Opis:
    The study describes a new method of assessing the average age of the forest range with significant share of stands in the regeneration class. In proposed method, average age of stands in regeneration layer is calculated as a mean age of tree layer as well as layer of upgrowth, recruitment and saplings weighed by these layers fraction. Example of calculation of average age was performed for 7 ranges located in Kotlina Kłodzka (SW Poland) with total area of 48 653 ha. Average age of stands calculated by proposed method vary from 62 to 73 years and is lower in comparison to average age calculating according to current regulations from 5 to 14 years. Proposed method of calculation the average age of stands in shelter wood cutting system takes into account composed structure of stands in regeneration period by using age and share of all trees generation in stand.
    Źródło:
    Sylwan; 2015, 159, 09; 732-739
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planowanie hodowlane w drzewostanach jodłowych o złożonej strukturze z wykorzystaniem metody BDq w Nadleśnictwie Zagnańsk
    Silvicultural planning in complex structures of silver fir by means of the BDq method in Zagnańsk Forest District
    Autorzy:
    Drozdowski, S.
    Bielak, K.
    Buraczyk, W.
    Gawron, L.
    Jaros, R.
    Żybura, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/990985.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    drzewostany jodlowe
    jodla pospolita
    Abies alba
    planowanie hodowlane
    struktura drzewostanu
    ksztaltowanie struktury
    metoda BDq
    close−to−nature silviculture
    complex stand structure
    multifunctional forestry
    silver fir
    silvicultural planning
    Opis:
    The paper deals with problems concerning silvicultural planning in silver fir stands in Zagnańsk Forest District (central Poland) that are characterized by complex structure. Based on a detailed inventory using 98 permanent circular sample plots in four control units the BDq method was employed for determining the future silvicultural activities of the current forest management cycle. The equilibrium model is based on diameter distributions and has the following parameters: B=35 m²/ha; D=63 cm and q−factor=1.28.
    Źródło:
    Sylwan; 2014, 158, 09; 651-660
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wzory empiryczne do określania suchej biomasy nadziemnej części drzew i ich komponentów
    Empirical formulae for determination of the dry biomass of aboveground parts of the tree
    Autorzy:
    Zasada, M.
    Bronisz, K.
    Bijak, S.
    Wojtan, R.
    Tomusiak, R.
    Dudek, A.
    Michalak, K.
    Wróblewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013519.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    obliczenia
    sosna zwyczajna
    lesnictwo
    biomasa
    czesci nadziemne
    wzory empiryczne
    Pinus sylvestris
    drzewa lesne
    dry biomass
    allometric equations
    scots pine
    carbon sequestration
    Opis:
    The paper presents empirical equations elaborated to determine dry biomass of Scots pine trees and their parts. Basing on the relationships between dry biomass of different tree parts and tree characteristics, various forms of commonly used non−linear biomass equations were examined. To assure additive character of biomass equations, seemingly unrelated regression was used for the final model fitting.
    Źródło:
    Sylwan; 2008, 152, 03; 27-39
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Współczynniki przeliczeniowe suchej biomasy drzew i ich części dla sosny pospolitej (Pinus sylvestris L.) w zachodniej Polsce
    Trees and their components biomass expansion factors for Scots pine (Pinus sylvestris L.) of western Poland
    Autorzy:
    Wojtan, R.
    Tomusiak, R.
    Zasada, M.
    Dudek, A.
    Michalak, K.
    Wróblewski, L.
    Bijak, S.
    Bronisz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/973910.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    biomass expansion factors
    Polska
    Lubuskie forest
    Scots pine
    lesnictwo
    dendrometria
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    biomasa sucha
    wspolczynniki przeliczeniowe
    Opis:
    Paper presents trees and their components biomass expansion factors for Scots pine growing in the Lubuskie Forest (western Poland). Elaborated formulae enable to determine aboveground biomass of Scots pine trees and stands basing on stem or merchantable wood volume.
    Źródło:
    Sylwan; 2011, 155, 04; 236-243
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomasa aparatu asymilacyjnego w drzewostanach sosnowych zachodniej Polski
    Biomass of assimilation apparatus in Scots pine stands of western Poland
    Autorzy:
    Bronisz, K.
    Bronisz, A.
    Zasada, M.
    Bijak, S.
    Wojtan, R.
    Tomusiak, R.
    Dudek, A.
    Michalak, K.
    Wróblewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009587.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    Polska Zachodnia
    sosna zwyczajna
    lesnictwo
    biomasa
    aparat asymilacyjny
    Pinus sylvestris
    biomass
    assimilation apparatus
    empirical formulae
    scots pine
    Opis:
    The paper presents empirical formulae for determination of dry and wet biomass of assimilation apparatus in Scots pine stands of western Poland. Analyzed equations were verified using relative percentage error. Influence of site conditions and different elements on accuracy of analyzed equations were also investigated.
    Źródło:
    Sylwan; 2009, 153, 11; 758-767
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tabele wiekowe dla drzew z wczesnosukcesyjnych drzewostanów brzozy brodawkowatej (Betula pendula Roth) na gruntach porolnych
    Age tables for silver birch (Betula pendula Roth) trees for early succession stands on abandoned agricultural lands
    Autorzy:
    Tomusiak, R.
    Ludwisiak, L.
    Bronisz, K.
    Baran, E.
    Bronisz, A.
    Wojtan, R.
    Bijak, S.
    Czajkowski, M.
    Zasada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991194.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    grunty porolne
    sukcesja wtorna
    drzewostany brzozowe
    brzoza brodawkowata
    Betula pendula
    cechy biometryczne
    wiek drzew
    age tables
    silver birch
    early succession
    abandoned agricultural lands
    age models
    Opis:
    The paper presents the tables for indirect determination of the age of silver birch (Betula pendula Roth) trees basing on easy to measure dendrometric parameters. We elaborated empirical formulae that enable determination of tree age using total tree height, breast height diameter and stump diameter as the predictors. Data was collected in 40 pure silver birch stands growing on former farmlands in Mazowsze region (central Poland). Sample material consisted of data from the stem analyses of 200 trees and measurements of 600 stumps. Obtained equations explain 70−86% of the age variability. The best fit was achieved for joint use of total tree height and breast height diameter as the independent variables.
    Źródło:
    Sylwan; 2014, 158, 08; 579-589
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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