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    Wyświetlanie 1-4 z 4
    Tytuł:
    Trwałość lasów miejskich na przykładzie "Lasu Wolskiego" w Krakowie
    Urban forests stability on the example of "Las Wolski" in Cracow
    Autorzy:
    Zygmunt, R.
    Banas, J.
    Zieba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/882483.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Tematy:
    lesnictwo
    lasy miejskie
    zasoby drzewne
    podrost
    trwalosc lasu
    Las Wolski
    Krakow
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2014, 16, 2A[39]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Inwentaryzacja martwego drewna statystyczną metodą reprezentacyjną z zastosowaniem warstw gatunkowo-wiekowych
    Inventory of deadwood by the means of a statistical representative sampling method using species-age layers
    Autorzy:
    Bujoczek, L.
    Bujoczek, M.
    Banaś, J.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989002.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drewno martwe
    miazszosc drewna
    zasoby drzewne
    szacowanie zasobow
    metody statystyczne
    typy siedliskowe lasu
    gatunki panujace
    wiek drzewostanu
    coarse woody debris
    snags
    measurements
    accuracy
    Opis:
    According to the current forest management manual, deadwood volume should be evaluated on 10% of sampling plots, located in different species−age layers, which are used for determining stand volume in a given forest unit. Sampling plot size differs depending on tree stand age and ranges from 0.005 to 0.05 ha. The results are reported for the entire forest district and by forest site type. The objective of the study was to analyze the accuracy of deadwood volume estimations in the light of the guidelines stipulated in the forest management manual and to find the ways to improve the obtained results. Deadwood volume was measured on 2752 sample plots used to determine stand volume and the mean value calculated on that basis was 5.4 m³/ha. Subsequently, 30 random draws of sampling plots were performed. Estimates based on randomly selected pools consisting of 10% of sampling plots ranged from 3.5 to 8.6 m³/ha. Subsequently, another 10% of sampling plots were randomly drawn and added to the previous ones. The results for 20% of sampling plots were 4.5−7.0 m³/ha, for 30% – 4.3−6.4 m³/ha, for 40% – 4.6−6.4 m³/ha and for 50% – 4.7−6.0 m³/ha. In the next step, 225 sampling plots located in reserves and special zones around the nests of protected species were discarded. The mean volume of deadwood computed for the managed forest areas alone (2527 sample plots) was 4.7 m³/ha. The random drawing procedure was repeated to give the following results: 3.6−6.8 m³/ha for 10% of sampling plots; 3.8−5.8 m³/ha for 20%; 3.9−5.3 m³/ha for 30%; 4.2−5.3 m³/ha for 40%; and 4.2−5.1 m³/ha for 50% of sampling plots. The categorization of the randomly selected sampling plots by forest site type in most cases yielded results significantly differed from the values computed based on all sampling plots. It was found that estimates based on 10% of sampling plots may diverge considerably from true values due to the uneven distribution of deadwood. In particular, managed and unmanaged forest areas should not be combined due to the high differences in the volume of deadwood between them. If a relatively low number of sampling plots is used, it seems advisable to report results only for the forest division as a whole, without a breakdown into site types. Satisfactory estimates for the different forest sites types would require much more work. The use of a greater number of sampling plots than specified in the forest management manual seems to be a fundamental prerequisite for improving the accuracy of deadwood volume estimates.
    Źródło:
    Sylwan; 2017, 161, 02; 114-123
    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
      Wyświetlanie 1-4 z 4

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