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    Wyświetlanie 1-6 z 6
    Tytuł:
    Zwiększenie efektywności inwentaryzacji lasu metodą losowania warstwowego
    Improving effectiveness of forest inventory by stratified sampling
    Autorzy:
    Banaś, J.
    Drozd, M.
    Zięba, S.
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/986979.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    inwentaryzacja lasu
    losowanie warstwowe
    poprawa efektywnosci
    sampling design
    inventory precision
    stratified sampling
    Opis:
    The purpose of the stratification is to group stands basing on the homogeneity of the measured feature. During periodic forest inventory in Poland, strata are created on the basis of age and the main species in stand within the boundary of forest district. In this work an improvement of distinguishing the strata during the forest inventory is presented. Three variants are considered: (1) distinguishing homogeneous strata in boundary of the whole forest district, not separately in forest subdistricts, (2) splitting species−aged strata into homogeneous substrata with respect to site quality, and (3) dividing strata of stands in the regeneration class with respect to stand density. Study was conducted in four mountain forest districts located in the Kłodzko Basin (SW Poland). Total area of these stands amounted to 43,052 ha, where 6,648 sample plots were established during the periodic inventory. ANOVA was used to test significance of the differences in tree volume and to assess variability reducing in distinguished substrata. Results indicated that in stands with age up to 70 years mean volume of trees on the sample plot does not differ significantly between sites, but in older stands difference was significant. Dividing age−species strata of stands older than 70 years into substrata according to site conditions influenced reduction of volume variability from 10 to 57% in newly created substrata. Dividing strata consisted of stands in regeneration class according to stand density index allowed to decrease the volume variability from 9 to 20%. Mean volume of trees in stands on similar sites does no differ significantly between subdistricts in the same forest district. Strata distinguished within the whole forest district are bigger and represented by more sample plots than on the subdistrict level, which significantly reduced standard error of volume and improved effectiveness of stratification in forest inventory.
    Źródło:
    Sylwan; 2017, 161, 10; 804-811
    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:
    Ocena funkcjonowania modeli ryzyka uszkodzenia drzewostanów przez wiatr w górach na przykładzie Tatrzańskiego Parku Narodowego
    Assessment of the risk models of the wind damage to the stands in the mountains - the Tatra National Park case study
    Autorzy:
    Zięba, S.
    Doleżuchowicz, M.
    Banaś, J.
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989579.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    wiatry
    huragany
    szkody w lesie
    szkody od wiatru
    uszkodzenia drzewostanow
    modele ryzyka uszkodzenia
    Tatrzanski Park Narodowy
    norway spruce
    damaged from the wind
    mountain forests
    forestry planning
    regional planning
    Opis:
    The paper assesses the performance of the risk models of the wind damage to the mountain forest stands located in the Tatra National Park (southern Poland). The models assume that the forest susceptibility to the damage from the wind depends on the characteristics of stands, their location and frequency of the occurrence of damage in the past. According to the methodology we built 5 variants of models, which take into account the following attributes: various stand features, forest type, regional factor of the damage to the the trees, thickness scrap, subversive and deadwood from the stand in the last 10 years, characteristics of the terrain: exhibition, slope inclination and altitude above sea level. The model output is a classification of the stand susceptibility to the wind damage expressed by a number between 0 and 3 (0.5 interval). The suitability of each variant was tested by comparing the in−class rate as well as the area and growing stock of undamaged and damaged stands. In this study we rated 2908 stands with a total area of 15,386.05 ha. Taking into account the risk class, it is possible to develop the appropriate procedures in order to limit the damage. The analysis conducted for the forests of the Tatra National Park showed high compliance of the developed risk models with the damages arising by the wind. This is confirmed by a particularly high proportion of damaged forest stands included in the class of high risk. Their fraction ranged from 43.8% (WR1) to 92.4% (WR5). Considering the position and stands characteristics the greatest damage arose at an altitude of 950 to 1000 m (70.2%) and the exposures NW, N and NE (60.2%).
    Źródło:
    Sylwan; 2016, 160, 05; 378-387
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany bieżącego przyrostu miąższości wybranych drzewostanów jodłowych Leśnego Zakładu Doświadczalnego w Krynicy w latach 1971-2011
    Changes of the current annual volume increment in selected fir stands in the Forest Experimental Station in Krynica in 1971-2011
    Autorzy:
    Banaś, J.
    Bujoczek, L.
    Drozd, M.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/994912.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    LZD Krynica
    drzewostany jodlowe
    przyrost miazszosci
    przyrost biezacy miazszosci
    current increment
    silver fir
    poland
    Opis:
    The paper describes the changes in the current annual volume increment of fir stands in the Forest Experimental Station in Krynica in 1971−2011. The research material are the results of five−fold measurements of stands on 238 control sample plots using an inventory and control method based on the statistical and mathematical system. On average, current annual volume increment in the 1970s amounted to 6.10 m³/ha/year, while in the 1980s to 8.46 m³/ha/year, in 1990s to 10.52 m³/ha/year and to 13.42 m³/ha/year in the last decade (2001−2011).
    Źródło:
    Sylwan; 2012, 156, 12; 908-913
    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
      Wyświetlanie 1-6 z 6

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