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    Wyświetlanie 1-11 z 11
    Tytuł:
    Ocena udzialu czesci skladowych wzoru na przyrost miazszosci drzew stojacych na przykladzie strzal sosny
    Autorzy:
    Orzel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/810769.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Pinus
    dendrometria
    wzory dendrometryczne
    sosna
    przyrost miazszosci
    lesnictwo
    drzewa lesne
    Źródło:
    Sylwan; 1999, 143, 11; 47-55
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Współzależność między niektórymi cechami dendrometrycznymi drzewa kształtującymi się pod wpływem warunków zewnętrznych
    Vzaimozavisimost mezhdu nekotorymi dendrometricheskimi priznakami dereva, formirujushhimisja pod vlijaniem vneshnikh uslovijj
    Correlation between some dendrometrie features of tree formed under the influence of external conditions
    Autorzy:
    Orzel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/824242.pdf
    Data publikacji:
    1989
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    przyrost drzew
    przyrost grubosci
    straty
    czynniki zewnetrzne
    Źródło:
    Sylwan; 1989, 133, 06
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomasa sześcioletnich sosen wyrosłych z mikoryzowanych i niemikoryzowanych sadzonek
    The biomass of 6-years-old pines grown from mycorrhized and non-mycorrhized seedling
    Autorzy:
    Orzeł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011861.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wzrost roslin
    sadzonki niemikoryzowane
    wysokosc
    cechy biometryczne
    sadzonki mikoryzowane
    sosna zwyczajna
    lesnictwo
    biomasa
    grubosc podstawy drzewa
    Pinus sylvestris
    drzewa lesne
    scots pine
    seedling
    controlled mycorrhization
    biomass
    empirical equations
    Opis:
    The research focuses on the effect of controlled mycorrhization of seedlings on growth parameters (height and diameter at the base) and biomass of Scots pine growing in two 6−year−old experimental plantations. Empirical equations were developed for the distinguished biomass fractions whose construction was based on a general formula for the allometric function.
    Źródło:
    Sylwan; 2009, 153, 04; 274-280
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intensywność przyrostu miąższości świerka z Beskidów Zachodnich
    The rate of volume growth in the Beskid Zachodni spruce
    Autorzy:
    Orzeł, S.
    Maruszewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1016309.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    Beskidy Zachodnie
    wiek drzewostanu
    intensywnosc przyrostu miazszosci
    swierk
    Picea
    wysokosc nad poziomem morza
    drzewostany swierkowe
    przyrost miazszosci
    lesnictwo
    drzewa lesne
    spruce
    volume growth rate
    position of trees above sea level
    correlation coefficient
    Opis:
    The research material including the results of a full analysis of 171 spruce stems, selected from among 57 stands growing at altitudes of 600−1,200 m a.s.l. indicated a significant impact of the position of a stand above sea level on volume growth rate and age of its culmination. Of the three properties dbh, height and basal area growth explain the greatest range of variability of growth rate (from 75% to 91.1%). Equations developed on the basis of the above mentioned properties allow determining the values for growth rates with the mean error of 7.17−13.97%.
    Źródło:
    Sylwan; 2007, 151, 01; 41-50
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przyrost grubosci na stosunkowych wysokosciach sosen wzrastajacych w roznych strefach przemyslowego zagrozenia
    Autorzy:
    Orzel, S
    Forgiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/816831.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    strefy przemyslowego zagrozenia
    drzewostany sosnowe
    przyrost grubosci
    sosna zwyczajna
    lesnictwo
    przyrost wzgledny grubosci
    Pinus sylvestris
    drzewa lesne
    Źródło:
    Sylwan; 2001, 145, 02; 49-59
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Szerokość pasma jądrowego estymatora rozkładu pierśnic w drzewostanach olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej
    Bandwidth of kernel estimator of DBH distribution in black alder (Alnus glutinosa (L.) Gaertn.) stands from west part of the Sandomierz Basin
    Autorzy:
    Pogoda, P.
    Ochał, W.
    Orzeł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/985919.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    piersnice drzew
    rozklad piersnic
    estymacja
    estymatory jadrowe nieparametryczne
    kernel estimator
    bandwidth
    dbh structure
    black alder
    Opis:
    Set of ‘nonparametric’ methods, that don’t make a priori assumption about functional form of empirical distribution was developed as an alternative to the parametric distribution modeling. The kernel estimators are one of such methods, that can be used to describe the frequency of data representing for example DBH records. Kernel smoothing requires the choice of weighting function and bandwidth also called as smoothing parameter or window. The lack of comprehensive analysis on the applicability of particular bandwidth selection methods to model DBH structure gave an impulse to present investigation aimed at determining value and variability of smoothing parameter in black alder stands. The optimal bandwidth was obtained according to six different variants of plug−in method proposed by Altman and Léger. Presented investigations were based on DBH measurements collected in 163 managed black alder stands aged from 6 to 89 years, growing in the west part of the Sandomierz Basin (S Poland). We measured in total 22,530 black alders, from 48 to 359 in individual stand. Stands were characterized by: age, quadratic mean diameter, basal area, mean height, Reineke’s stand density index and standard deviation of DBH. Smoothing parameter was obtained by means of plug−in method with the pilot bandwidth selected by: Silverman’s rule of thumb (nrd0), Scott’s method (nrd), unbiased cross−validation (ucv), biased cross−validation (bcv), method of Sheather and Jones (sj) and one−stage method of Wand and Jones (onestage). The bandwidth was first obtained to real data, then to 100 bootstrap samples of 5, 10, 15 ... and 100 trees from each stand. Smoothing parameters were characterized by mean and variance. Relationship between values of smoothing parameter and stand characteristics was determined. Finally the influence of sample size on value and variability of bandwidth was assessed. Value and variability of smoothing parameter in black alder stands are determined by stand age, sample size and method of bandwidth choice. There is a close relationship between bandwidth and the mean height (r from 0.75 to 0.83), quadratic mean diameter (r from 0.79 to 0.88) and standard deviation of DBH (r from 0.84 to 0.93). Potentially these stand features can be used to predict smoothing parameter values. Minor changes of bandwidth for samples containing above 50 trees together with persistence of standard error give an objective grounds for defining optimal number of diameters, that are necessary to kernel estimation of DBH distribution.
    Źródło:
    Sylwan; 2018, 162, 05; 411-421
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stała krzywa wysokości dla olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej
    Generalized height-diameter model for black alder (Alnus glutinosa (L.) Gaertn.) in the western part of the Sandomierz Basin
    Autorzy:
    Orzeł, S.
    Pogoda, P.
    Ochał, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/991312.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    piersnice drzew
    wysokosc drzew
    stale krzywe wysokosci
    Kotlina Sandomierska
    alder stands
    height−diameter curve
    local uniform height curve
    the sandomierz basin
    Opis:
    The study shows that the accuracy of tree height approximation by means of investigated functions is not modified by the age or site conditions of the analysed alder stands. The widest range of tree height variability was explained by Schnute (M5) function. Higher values of adjusted coefficient of determination (R²adj) are usually obtained when the height of black alder stands in the western part of the Sandomierz Basin is determined with M2 height−diameter curve.
    Źródło:
    Sylwan; 2014, 158, 11; 840-849
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określania świeżej masy strzał jodły na podstawie przeliczników wagowo-objętościowych
    Accuracy of estimation silver fir stem mass on the basis of volume to weight conversion factors
    Autorzy:
    Ochal, W.
    Wertz, B.
    Grabczyński, S.
    Orzeł, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/985798.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    jodla pospolita
    Abies alba
    biomasa drzewna
    masa strzaly drzew
    biomasa swieza
    szacowanie biomasy
    wspolczynniki wagowo-objetosciowe
    gestosc drewna
    abies alba
    wood density
    stem biomass
    biomass estimation
    Opis:
    The paper describes the accuracy of estimation of silver fir stem fresh mass on the basis of volume to weight conversion factor, derived from samples, collected from few different places along the stem. The research material contained 13 sample trees selected from homogenous 70−years old stand, situated in mountainous area of the Beskid Sądecki in Polish part of the Carpathians (S Poland). Volume over the bark of sample trees was calculated with section−wise method and the whole stem fresh biomass was directly weighted. For each sample tree three stem discs were collected at 1/6, 1/2 and 5/6 of tree height, their weight and volume were precisely determined and the biomass conversion factors (equivalent of stem density) were calculated. The assessment of the accuracy of whole fresh stem biomass was conducted according to five variants: for the biomass conversion factors derived from each individual stem disc (lower, middle or upper), from weighted mean density and on the basis of the constructed mixed model, where relative height and diameter were treated as fixed effects and influence of individual trees was included as a random term. The volume of sample fir stems ranged from 0.15 to 2.22 m3, while their fresh biomass varied between 138.1 and 1896.7 kg. Obtained results show that variation of the density was higher within stems than between them (coefficient of variation amounted to 8.4% i 3.3% respectively). The average density increased along stem, from 835.6 kg/m3 for lower part (1/6H) to 986.8 kg/m3 for the upper part (5/6H). Estimating the biomass on the basis of just lower stem disc resulted in the average relative error equal to –5.8%, while for middle stem disc the error was +1.2%, and for upper disc +11.3%. The use of conversion factors derived from weighted average density of all three stem discs resulted in average bias equal to –1,7% with standard error 1,0%. Despite the presence of mean bias of –2.3%, the constructed density model gave the most precise estimation of the stem biomass (standard error 0.7%), which indicates the reasons for its further improvements and usage.
    Źródło:
    Sylwan; 2018, 162, 04; 277-287
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność stałych krzywych wysokości dla drzewostanów olszy czarnej (Alnus glutinosa (L.) Gaertn.)
    Accuracy of the uniform height curves for black alder (Alnus glutinosa (L.) Gaertn.) stands
    Autorzy:
    Ochał, W.
    Orzeł, S.
    Siudak, K.
    Zamyślewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989648.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewostany olszowe
    drzewa lesne
    olsza czarna
    Alnus glutinosa
    piersnice drzew
    wysokosc drzew
    stale krzywe wysokosci
    h−d relationship
    uniform height curve
    forest inventory
    black alder
    Opis:
    The study presents the assessment of the accuracy of two generalized height−diameter models, such as skwB [Bruchwald et al. 2001] and skwO [Orzeł et al. 2014], developed in Poland for black alder (Alnus glutinosa (L.) Gaertn.) stands. Verification of these models was conducted on empirical material that was collected in 127 alder stands located in the western part of Sandomierz Basin (southern Poland). Selected alder stands aged 6−89 years, while average breast height diameter ranged from 4.5 to 43.0 cm and average height from 6.3 to 32.7 m. The stand density varied from 222 to 4360 trees/ha. The accuracy assessment for uniform height−diameter curves was based on the analysis of single tree absolute error distributions. Synthetic indicators of goodness−of−fit, such as: average and standard errors, coefficients of variation and determination were calculated based on absolute errors. The final evaluation of the compared uniform height−diameter models results from the structure of the goodness−of−fit measures that was observed within all analyzed stands and within age classes of 20 years. The efficiency of uniform height−diameter models was also compared with stand height−diameter curve, which was developed based on the Näslund function. General height−diameter models overestimated height in alder stands on average from 0.26 (1.67) to 0.19 m (1.39%), based on skwB and skwO models, respectively. Bias depended on the age of stand and decreases from almost 3% in I age class to nearly 0.5% in IV and V age class. For both analyzed models, a positive systematic error was observed for the standardized breast height diameter. Bias in estimating the height of single stand depended on the accuracy of stand height estimations. In case of estimation based on the measurements of three trees height, bias in single stand can range from –13% to +14%. Due to the range and nature of observed systematic errors, uniform height curves should be applied to groups of stands that have different age and breast height diameter structure, as it allows for partial reduction of the error.
    Źródło:
    Sylwan; 2016, 160, 08; 635-646
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alokacja nadziemnej biomasy u sosen zajmujących różne pozycje biosocjalne w drzewostanie
    Aboveground biomass allocation in Scots pines of different biosocial positions in the stand
    Autorzy:
    Ochał, W.
    Grabczyński, S.
    Orzeł, S.
    Wertz, B.
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/991636.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    pozycja biosocjalna drzew
    sosna zwyczajna
    Pinus sylvestris
    biomasa nadziemna
    alokacja biomasy
    scots pine
    aboveground biomass
    biomass allocation
    biosocial class
    Opis:
    The aim of this study was to assess the impact of the biosocial position occupied by the tree on the amount and structure of the biomass produced. The empirical material was measurements of biomass for 63 pines (21 for each of the I, II, and III Kraft classes). The total aboveground biomass of the trees was calculated as sum of following fractions: stem wood, stem bark, living branches, dead branches, shoots, needles and cones. It has been found that with a decrease of biosocial position of tree the share of a stem increases while share of branches in the overall biomass of the tree decreases. On the other hand biosocial position does not affect significantly the share of needles, dead branches and cones.
    Źródło:
    Sylwan; 2013, 157, 10; 737-746
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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