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Wyświetlanie 1-5 z 5
Tytuł:
Zaleznosc miedzy wysokoscia a piersnica w drzewostanach brzozy omszonej [Betula pubescens Ehrh.] w Biebrzanskim Parku Narodowym
Autorzy:
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/818096.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
stale krzywe wysokosci
Betula pubescens
wysokosc drzew
Biebrzanski Park Narodowy
parki narodowe
lesnictwo
piersnice drzew
brzoza omszona
drzewostany brzozowe
Źródło:
Sylwan; 2000, 144, 12; 51-56
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Produkcyjność plantacji wybranych klonów topoli w południowo-wschodnim Kazachstanie
Productivity of the selected poplar cultivars in the plantation conditions in south-eastern Kazakhstan
Autorzy:
Sarsekova, D.N.
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/991006.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa szybkorosnace
topola
klony
wzrost roslin
piersnice drzew
wysokosc drzew
miazszosc drzew
uprawa plantacyjna
plantacje drzew lesnych
produkcyjnosc
Kazachstan
forest productivity
land reclamation
initial spacing
tree stocking
volume increment
Opis:
The topic of forest plantations is particularly important in countries with low forest cover, where the demand for wood is particularly high, such as e.g. Kazakhstan. The main goal of this paper is to present the results of research on the productivity of selected cultivars of poplar: 62027−1 hybrid and Kazakh poplar, grown in various spacings (2,5×1, 3×1,5 and 3×2 m, which translates to stocking of 4000, 2220 and 1667 trees per ha, respectively), and the possibility of their cultivation in the conditions of southeastern Kazakhstan. The conducted experiments confirmed the high production potential of the selected hybrid poplars. The average volume of the individual trees' trunks at the age of 23 years reached 0,4−0,5 m³, the total growing stock can be up to 800−1000 m³/ha and the mean annual increment from 29 to 44 m³/ha. More adapted to the local conditions proved to be hybrids belonging to a section of white poplars. Due to dying tree tops and signs of damage from insects emerging at age exceeding 22−23 years, observed especially in plantations consisting up of hybrids belonging to the black poplars section, plantation rotation should not exceed 20 years. Establishing the poplar plantations using selected varieties is also one of the promising ways for reclamation of the saline soils of south−eastern Kazakhstan. Along with the timber and the possible use of biomass, plantations can be also used as a source of feed and hay for livestock.
Źródło:
Sylwan; 2014, 158, 06; 453-462
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zależność między pierśnicą a cechami koron uzyskanymi z lotniczego skanowania laserowego
Relationship between dbh and crown characteristics derived by airborne laser scanner
Autorzy:
Zasada, M.
Stereńczak, K.
Brach, M.
Powiązania:
https://bibliotekanauki.pl/articles/973712.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lasy
skanowanie laserowe
lidar
korony drzew
pomiary
powierzchnia rzutu korony
piersnicowe pole przekroju
leśnictwo
drzewa leśne
pierśnice drzew
pierśnicowe pole przekroju
airborne laser scanning
dbh
crown parameters
Opis:
The main goal of the study was the determination of the relationship between selected crown parameters derived from automatically processed airborne laser scanning (ALS) data and tree diameter. It has been found that the best set of features for that purpose is crown projection area (CPA) as a predictor and tree basal area (BA) as dependent variable. Two algorithms of crown segmentation (‘growing’ and ‘pouring’) have been analysed. Weibull, exponential and hyperbole functions have been the best for description of the relationship between CPA and BA. The relationship between tree diameter and crown characteristics was significant, but relatively weak. This can be attributed to the fact, that the relationship can be modified by various stand characteristics. Including such variables as tree stocking and crown closure should improve the model significantly.
Źródło:
Sylwan; 2011, 155, 11; 725-735
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uproszczone wzory empiryczne do określania suchej biomasy nadziemnej części drzew i ich komponentów dla sosny zwyczajnej
Simplified empirical formulas to determine the dry biomass of aboveground components of trees for Scots pine
Autorzy:
Bronisz, K.
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/989260.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
sosna zwyczajna
Pinus sylvestris
biomasa nadziemna
obliczenia
wzory empiryczne
wzory uproszczone
piersnice drzew
allometric equation
scots pine
biomass
seemingly unrelated regression
Opis:
So−far developed and published Polish equations for determination of aboveground biomass of Scots pine are based on two predictors: diameter at the breast height (DBH) and tree height. The main goal of the presented study were i) to build the simplified empirical biomass equations that use exclusively DBH as the independent variable, and ii) to compare the obtained results with values from equations based on both predictors (optimal model). The empirical material consisted of biomass data for 90 Scots pines growing on typical habitats in Bory Lubuskie (western Poland). The elaborated equations have a lower accuracy than the optimal ones. The R² value for all biomass components is higher than 0.69, and reaches as much as 0.976 in the case of dry wood biomass. The root mean square error (RMSE) for such components as dry biomass of bark and alive or dead branches and branches with needles is lower for the simplified model. However, for the dry wood biomass the optimal model has lower RMSE value. Because this component has the largest share in the total aboveground tree biomass (AGB), the resulting RMSE for the AGB is lower than for the optimal model. Optimal model is also more accurate when the mean error is considered. The simplified model can be used when there are no height measurement available or there is an anxiety that the use of height−diameter models significantly increases the uncertainty of results.
Źródło:
Sylwan; 2016, 160, 04; 277-283
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie rozkładów pierśnic młodocianych drzewostanów brzozy brodawkowatej na gruntach porolnych za pomocą dwuparametrowego rozkładu Weibulla
Modeling dbh distribution of young silver birch stands on former agricultural lands with the 2-parameter Weibull distribution
Autorzy:
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/991512.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
drzewostany mlode
grunty porolne
drzewostany brzozowe
brzoza brodawkowata
Betula pendula
piersnice drzew
rozklad piersnic
modelowanie
rozklad Weibulla
betula pendula
secondary succession
diameter distribution
weibull
Opis:
The paper presents the diameter distributions of young silver fir stands (Betula pendula Roth.) growing on former agricultural lands described using the 2−parameter Weibull distribution. Various methods of parameters' estimation were tested: maximum likelihood method, method of moments and percentile approach. It was found, that the diameter distributions in such birch stands can have various shapes and forms – from close to the exponential to almost normal. The shape parameter were not affected by the age of the stand, but the scale parameter was strongly correlated with age. The most efficient methods for the tree diameter distribution modeling using the 2−parameter Weibull distribution are the method of moments and the maximum likelihood method. However, the obtained results does not exclude the percentile method, which is relatively simple and can be further modified for obtaining better results.
Źródło:
Sylwan; 2013, 157, 04; 268-277
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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