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Wyszukujesz frazę "Grabczynski, S." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Przyrost piersnicy drzew w szescdziesiecioletnich drzewostanach swierkowych Beskidow Zachodnich
Autorzy:
Grabczynski, S.
Powiązania:
https://bibliotekanauki.pl/articles/820693.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
dendrometria
Beskidy Zachodnie
drzewostany swierkowe
lesnictwo
piersnice drzew
przyrost drzew
Źródło:
Sylwan; 1998, 142, 09; 13-17
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kształtowanie się przyrostu pierśnicy drzew w drzewostanach świerkowych masywu Skrzyczne w Beskidach Zachodnich
Formation of the dbh increment in spruce stands of the Skrzyczne massif in the Beskidy Mountains
Autorzy:
Grabczyński, S
Powiązania:
https://bibliotekanauki.pl/articles/1019595.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Beskidy Zachodnie
masyw Skrzycznego
wysokosc nad poziomem morza
przyrost piersnicy
drzewostany swierkowe
lasy gorskie
lesnictwo
piersnice drzew
spruce
beskidy zachodnie mountains
dbh increment
height a.s.l.
Opis:
In the study the formation of the dbh increment in spruce stands throughout their whole life in the Skrzyczne massif in the Beskidy Zachodnie Mountains has been presented. This increment can be illustrated by means of an exponential function according to the following formula: Zr=exp(a + b·ln(w)+c·ln2(w)), regardless of the altitude above see level at which trees grow. This altitude however has an effect on the value of function parameters.
Źródło:
Sylwan; 2006, 150, 01; 3-7
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność wzorów empirycznych służących do określania biomasy nadziemnych komponentów drzew olszy czarnej (Alnus glutinosa (L.) Gaertn.)
Accuracy of empirical formulas for determining aboveground biomass of black alder (Alnus glutinosa (L.) Gaertn.)
Autorzy:
Ochał, W.
Socha, J.
Grabczyński, S.
Powiązania:
https://bibliotekanauki.pl/articles/990997.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
olsza czarna
Alnus glutinosa
biomasa
czesci nadziemne
wzory empiryczne
dokladnosc wzorow
black alder
aboveground biomass
accuracy assessment
empirical formulas
poland
Opis:
The study investigated the accuracy of thirty equations formulated in England, Sweden, Turkey, Lithuania and Spain and which aim to determine the aboveground biomass of black alder. The reference constituted of bark, timber, stem, branches and leaves dry biomass of 168 sample trees aged 6−96 from 56 alder stands located in the western part of Kotlina Sandomierska (south−eastern Poland). The analysed formulas, considering local conditions, resulted in biased biomass calculations. The evaluation of such components as leaves, branches, trunk timber or trunk bark is subject to systematic errors larger than a dozen or so per cent, and in certain ranges of breast height diameters − up to even a couple of dozens or a few hundred per cent. Only three out of 30 formulas may be considered useful for estimating aboveground biomass of black alder in Poland.
Źródło:
Sylwan; 2014, 158, 06; 431-442
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:
Modele bonitacyjne dla gatunków lasotwórczych Polski opracowane na podstawie tablic zasobności
Site index models for forest-forming tree species in Poland developed basing on the yield tables
Autorzy:
Socha, J.
Ochał, W.
Grabczyński, S.
Maj, M.
Powiązania:
https://bibliotekanauki.pl/articles/989707.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
gatunki lasotworcze
modele wzrostu
siedliska lesne
modele bonitacyjne
wskazniki bonitacji
site index
site index model
height growth models
Opis:
The objectives of this work was to develop a site index models for main forest−forming tree species in Poland based on data from published yield tables. The research material include growth series of birch, European beech, common oak, red oak, European hornbeam, European ash, Norway maple, small−leaved lime, black alder, trembling aspen, locust, Douglas fir, silver fir, European larch, Scots pine, and Norway spruce. Six algebraic difference models were preliminary selected for the construction of site index model. When selecting a potential models an assumption was made, that the index system should be characterized by good fit to the empirical data, polymorphism, variable asymptotes for different sites and equality of the site index and height at a certain base age. To estimate parameters of individual models all possible combinations among height−age pairs for each tree were used. The selection of the best model was based on fit criteria describing: proportion of variance explained, error range and standard deviation of the residuals. Best fitting model was selected basing on the sum of ranks from individual criteria and for each individual tree species a separate model was selected, which fits the best growth series from the yield tables. For 16 out of 19 species, the best fit statistics were demonstrated by the model developed on the base of the function [2]. Developed models may be used both in forestry practice and forestry research in order to estimate site index for analyzed tree species.
Źródło:
Sylwan; 2015, 159, 08; 639-649
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
Tytuł:
Wpływ wzniesienia nad poziom morza i podłoża geologicznego na produkcyjność siedlisk Beskidu Żywieckiego dla buka
Effect of elevation above sea level and geology on the site productivity for European beech in the Beskid Zywiecki Mountains
Autorzy:
Socha, J.
Ochał, W.
Maj, M.
Grabczyński, S.
Lach, J.
Gruba, P.
Powiązania:
https://bibliotekanauki.pl/articles/991314.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
buk zwyczajny
Fagus sylvatica
wymagania siedliskowe
Beskid Zywiecki
siedliska lesne
produkcyjnosc
wysokosc nad poziomem morza
ekspozycja
nachylenie stoku
bonitacja siedliska
podloze geologiczne
fagus silvatica
site index
parent rock
soil nutrient regime
site productivity
Opis:
The aim of the study was to determine the effect of topography and parent rock as well as selected characteristics of the soils on the site productivity for European beech in the Beskid Żywiecki Mountains (S Poland). The research material consisted of measurements performed on sample plots ranging in size from 0.01 to 0.10 ha located in 50 beech stands aged 40−140 years. Productivity of beech stands was to the greatest extent determined by the elevation above sea level. The site index of beech stands is significantly affected by the type of geological substrate, whereas there was no relationship between productivity and analyzed soil characteristics.
Źródło:
Sylwan; 2014, 158, 11; 850-859
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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