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Wyświetlanie 1-15 z 18
Tytuł:
Uproszczony model rozkładu pierśnic jednowiekowych niepielęgnowanych drzewostanów sosnowych (Pinus sylvestris L.)
Simplified model of diameter distribution for even-aged unthinned Scots pine (Pinus sylvestris L.) stands
Autorzy:
Jagiełło, R.
Beker, C.
Powiązania:
https://bibliotekanauki.pl/articles/986956.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
sosna zwyczajna
Pinus sylvestris
drzewostany sosnowe
drzewostany jednowiekowe
drzewostany niepielegnowane
rozklad piersnic
rozklad uproszczony
rozklad gamma
diameter distribution
gamma poisson
scots pine
unthinned stand
Opis:
Although modelling of the diameter at the breast height (DBH) distributions has long history, theoretical discrete distributions have not so far been used for this purpose. In this study we use measurements covering 25 years (six inventories) without silvicultural influence on 14 even−aged Scots pine (Pinus sylvestris L.) stands to develop the DBH distribution models. Analysed stands are located in Murowana Goślina Forest Experimental Station (W Poland). The objective of the study was to elaborate the most simplified model that applies stand variables easy to assess and uncomplicated theoretical distribution. We employed two−parameter Gamma Poisson (GP) distribution and compared it to Weibull (W) and Sb Johnson (SbJ) ones. When maximum likelihood estimation (MLE) was used, GP gave similar results to W and both were slightly worse than SbJ. We found that both DBH standard deviation and stand density have substantial impact for model bias when above distributions used. Stepwise regression analysis was used for obtaining linear equations for parameter prediction of GP distribution. Then, GP model was simplified by removing standard deviation of DBH (SDD) from equation for overdispersion parameter. Results showed slight increase in mean of error values (i.e. modified Reynolds e index and root mean square error) for simplified model (SGP) compared with those for model including SDD, but differences in means were insignificant. Minimal and mean DBH represent enough variability of diameter distribution to obtain appropriate model based on Gamma Poisson distribution. Error was only 5% greater from four−parameter SbJ (MLE) distribution with similar range: 8.2−28.8% against 5.1−25.5% for SGP and SbJ respectively. The presented model can be used in many branches of forestry for more accurate calculation of stand level variables, when additional allometric equations employed, for instance assimilation apparatus volume or below− and aboveground biomass.
Źródło:
Sylwan; 2017, 161, 10; 822-830
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiana struktury biosocjalnej w niepielęgnowanych drzewostanach sosnowych
Changes in the biosocial structure of unthinned Scots pine stands
Autorzy:
Beker, C.
Powiązania:
https://bibliotekanauki.pl/articles/1015657.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
drzewostany niepielegnowane
klasy Krafta
sosna zwyczajna
lesnictwo
Pinus sylvestris
drzewa lesne
kraft's classification
scots pine stands
pinus sylvestris l.
Opis:
The paper presents research results on the changes in the biosocial structure in unthinned Scots pine stands. Measurement data comes from 14 permanent research plots, encompassing proportionally the tree stands of 2nd to 5th age classes.
Źródło:
Sylwan; 2008, 152, 05; 44-51
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wlasciwe liczby ksztaltu strzal przy roznych ilorazach L/n w drzewostanach sosnowych
Autorzy:
Beker, C.
Powiązania:
https://bibliotekanauki.pl/articles/823192.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
dendrometria
sosna
lesnictwo
zmiennosc
wlasciwa liczba ksztaltu strzaly
drzewa lesne
Źródło:
Sylwan; 2000, 144, 10; 95-106
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika naturalnego wydzielania się drzew w drzewostanach sosnowych
Dynamics of natural supression of trees in pine stands
Autorzy:
Beker, C.
Powiązania:
https://bibliotekanauki.pl/articles/1022659.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
lesnictwo
wydzielanie sie drzew
pine stands
pinus sylvestris l.
standing dead trees
dynamics
thinning grade
Opis:
This paper presents research results on the dynamics of natural suppression of trees in pine stands. Measurement data come from 14 permanent research plots, encompassing proportionally the tree stands of 2nd to 5th age classes.
Źródło:
Sylwan; 2005, 149, 12; 45-52
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Związek pomiędzy biologiczną i matematyczną wysokością górną w drzewostanach sosnowych
The relation between biological and mathematical top height in Scots pine stands
Autorzy:
Beker, C.
Powiązania:
https://bibliotekanauki.pl/articles/1013386.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
wysokosc gorna
sosna zwyczajna
lesnictwo
urzadzanie lasu
Pinus sylvestris
drzewa lesne
top height
pine stands
pinus sylvestris l.
Opis:
The paper presents study on the relationship between biological and mathematical top height in Scots pine stands. Measurement data come from 14 permanent research plots encompassing proportionally tree stands of IInd to Vth age classes.
Źródło:
Sylwan; 2008, 152, 11; 40-46
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ typu siedliskowego lasu na wielkość i masę igieł opadających w ciągu roku w 30-letnich drzewostanach sosnowych
Impact of the forest habitat type on the size and mass of the annual needles fall in 30-year-old Scots pine stands
Autorzy:
Turski, M.
Beker, C.
Jaszczak, R.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/979218.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
sosna zwyczajna
Pinus sylvestris
czynniki siedliska
typy siedliskowe lasu
leśnictwo
opad igieł
needles fall
mass and size
forest habitat
Opis:
The article presents the size and weight of needles in 30−year−old Scots pine stands over one year with regard to the site conditions in which they grow (fresh mixed coniferous and fresh coniferous habitats). Two rectangular 1−hectare sample plots, which differed from one another only with the habitat type, were set up in Maszewo forestry in the Cybinka Forest District (western Poland). The plots were divided into 100 one−acre subplots, which were ascribed numbers from 1 to 100. In order to pick 10 plots a random number generator was used. The middle of the chosen plot became the central point of the 1−acre circular sample plots, where the measurements of all diameters at breast height and the height of every fifth tree were taken. Moreover, it was also the place where a square needle collection container (20 cm high, 1 m2 area) was located. The empty containers were placed in both experimental plots on 1st August 2017 and they were emptied on the first day of each month, throughout the entire year. The entire material was dried at the temperature of 65°C with an induced air flow. The needle mass was measured with the accuracy up to 0.001 g. Out of the samples collected each month, 300 needles were chosen at random in order to measure their length (after they were scanned with WinFOLIA program the size of each individual needle was established). Throughout the entire year, on fresh coniferous habitat the mass of the fallen needles was 2.8203 t/ha and it was by over 20% higher than it was determined for the fresh coniferous habitat. The lowest mass of the needle fall in each stand was in January, and the greatest in September on the fresh coniferous habitat, whereas in October on the fresh mixed coniferous habitat. In both of these cases, it was more than a half of the needle mass for the entire year. The average length of the fallen needles was in each month smaller on the fresh coniferous habitat and the differences between the analyzed stands were significant. The difference was the smallest (3.3%) in May, while the greatest (18.8%) in February. Moreover, significant differences in the length of the needles in the particular months in both types of stands were observed. The coefficient of variation for the needles length on the fresh mixed coniferous habitat ranged from 17.4 to 22.8%, whereas on the other habitat it varied between 14.2 and 21.6%. The mean of the coefficients of variation for the particular months was lower by 2.0% and for fresh coniferous habitat it reached 18.25%.
Źródło:
Sylwan; 2020, 164, 02; 118-126
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wysokość górna w drzewostanach sosnowych
Top height in pine stands
Autorzy:
Beker, C.
Powiązania:
https://bibliotekanauki.pl/articles/973178.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
Pinus
dendrometria
sosna
wysokość górna
leśnictwo
wysokość przeciętna
drzewa leśne
top height
average height
pine stands
Pinus sylvestris L.
Opis:
This paper presents study on the change with age of top height and the relationship between average height and top height in pine stands. Measurement data come from 14 permanent research plots, encompassing proportionally the tree stands of IInd to Vth age class.
Źródło:
Sylwan; 2007, 151, 03; 36-42
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena zgodności rozkładów empirycznych pierśnic drzewostanów bukowych różnych klas wieku z wybranymi rozkładami teoretycznymi
Goodness of fit evaluation of the breast height diameter distributions of beech stands differing in age with selected theoretical distributions
Autorzy:
Jagiełło, R.
Beker, C.
Jagodziński, A.M.
Powiązania:
https://bibliotekanauki.pl/articles/989389.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany bukowe
klasy wieku
buk zwyczajny
Fagus sylvatica
piersnice drzew
rozklad empiryczny
rozklad teoretyczny
ocena zgodnosci
diameter distribution
finite mixture distribution
beech stand
fagus sylvatica
Opis:
Modelling is one of the basic activities in the field of biological sciences. The main purpose of modelling is to illustrate relationships and phenomena of biological objects (and traits describing them) and present reality as close as it is possible with expected range of error. In the paper we presented results of approximation of the selected theoretical distributions, i.e. singular (normal, log−normal, gamma, two− and three−parameter Weibull, Johnsons SB) and finite mixture (normal, log−normal, gamma and Weibull) to tree diameter distributions in beech stands (Fagus sylvatica L.). The main aim of the study was to evaluate goodness of fit of selected distributions, prove legitimacy of using mixture distributions in even−aged, single−species beech stands and find the best distribution of model diameter distribution in a whole production cycle of this kind of stands. The study was conducted in 32 sample plots located in north−western Poland in stands at the age between 9 and 140. For the evaluation χ² test, a modified error index (e) and a root mean square error (RMSE) were used. We found that the RMSE and e are related in most cases with stand density. Mean values of used indicators show that finite mixture distributions are better in comparison to singular distributions. The best fitted distributions were Johnsons SB and mixture of gamma ones. Range of error index expressed with number of trees per hectare ranges 16.5−32.8% and 7.7−27.0% for this distributions, respectively. Conversely the worst results were obtained by fitting two−parameter Weibull distribution both in singular and mixture. Future diameter distribution model based on the probability distribution should be based on Johnson SB or 3−parameter Weibull distribution from singular ones or gamma from finite mixture. In case of age class apportionment unequivocal the best result were obtained with Johnson SB and partially with mixture gamma distributions.
Źródło:
Sylwan; 2016, 160, 02; 107-119
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena stanu zagrożenia środowiska leśnego Puszczy Zielonka przez zanieczyszczenia powietrza atmosferycznego w latach 1992-2006
Assessment of the threat to the forest environment in the Zielonka Primeval Forest from air pollution in 1992-2006
Autorzy:
Beker, C.
Sienkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1009732.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
zagrozenia lasu
drzewostany sosnowe
Puszcza Zielonka
monitoring techniczny
dwutlenek siarki
lasy
pyly
lesnictwo
zanieczyszczenia powietrza
imisja zanieczyszczen
emission
so2 imission
dust fail
scots pine stands
Opis:
Since 1992, the Forest Management Department in cooperation with the Forestry Natural Foundation Department of the University of Life Sciences in Poznań have been regularly monitoring the levels of sulphur compound and dust emissions in the Zielonka Primeval Forest at observation points distributed on 14 permanent study sites located in pine stands in age classes II−V. This paper presents an assessment of the threat posed to the forest environment on the basis of changes in the industrial emission level over the past fifteen years in this area of special value for nature. In 1993, the area was included in the "Puszcza Zielonka" Landscape Park.
Źródło:
Sylwan; 2009, 153, 07; 451-456
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wydajność aparatu asymilacyjnego sosny zwyczajnej (Pinus sylvestris L.) różnych klas wieku
Productivity of the assimilation apparatus of Scots pine (Pinus sylvestris L.) in various age classes
Autorzy:
Turski, M.
Beker, C.
Jaszczak, R.
Powiązania:
https://bibliotekanauki.pl/articles/989700.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
klasy wieku
klasy Krafta
drzewa lesne
sosna zwyczajna
Pinus sylvestris
aparat asymilacyjny
wydajnosc aparatu asymilacyjnego
volume of leaved twigs
productivity of assimilating apparatus
age classes
kraft's classes
Opis:
Productivity of the assimilating apparatus is commonly defined as an increment in volume, most typically of the stem or trunk, per unit of crown size. In this paper the productivity of the assimilating organ (CPtwn1) is calculated as a quotient of the average annual increment in stem volume from a 5−year period (iv1) and the volume of twigs with needles (twnv), determined by xylometry methods (fluid displacement method). The experimental material comprised measurements taken on 200 Scots pines (Pinus sylvestris L.) in 8 pure pine stands growing in western Poland (tab. 1). Using the calculated sizes of assimilating apparatus, their arithmetic means and coefficients of variation were calculated for each stand (tab. 2, 3). Additionally, mean crown productivity within each Kraft's class comprising the dominant trees (classes 1, 2 and 3) as well as in the dominated trees (classes 4 and 5) were determined. The strength of the relationship between CPtwn1 and diameter at breast height (d1.3), height (h) and volume of leaved twigs (twnv) was calculated (tab. 4). Moreover, a two−way analysis of variance was conducted to assess the statistical significance of the effect of age of the stand and biosocial class of tree position in the stand (within the dominant trees and the dominated trees) on productivity of the assimilating apparatus. Mean productivity of analysed Scots pine crowns takes the highest values in the youngest stand (0.60 m³), while the lowest – in the oldest stand (0.34 m³). In the youngest, 25−year old pine stand, mean productivity of the assimilating apparatus in trees forming the dominated trees is by 124% greater than that of trees forming the dominant trees. An opposite situation is found in the oldest, 93−year−old stand, where mean productivity of the dominant trees is over 1.5 greater than that recorded in the dominated trees. Statistically significant effect of the stand age on productivity of the assimilating apparatus was observed (tab. 5). However, affiliation of a tree to the dominant or dominated trees does not result in such an effect. On the other hand, there is an interaction between age of the stand and its affiliation to the Kraft's classes. This means that the affiliation of trees to the dominant trees or the dominated trees and its effect on mean productivity of the assimilating apparatus depend on the age of stand.
Źródło:
Sylwan; 2015, 159, 01; 36-44
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Retrospektywna analiza wzrostu i przyrostu drzew w 30−letnim drzewostanie jodły kalifornijskiej (Abies concolor Eng.)
Retrospective analysis of growth and increment of trees in 30−years−old stand of white fir (Abies concolor Eng.)
Autorzy:
Beker, C.
Flieger, K.
Turski, M.
Powiązania:
https://bibliotekanauki.pl/articles/994778.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
sosna kalifornijska
Abies concolor
wzrost roslin
dynamika wzrostu
przyrost wysokosci
przyrost piersnicowego pola przekroju
przyrost miazszosci
white fir
growth
height
breast height diameter
basal area
volume
Opis:
The paper presents the results of the retrospective research on the height and diameter growth of trees in a 30−year−old white fir (Abies concolor Eng.) stand growing in the mixed broadleaved forest habitat in the Forest Experimental Station in Siemianice. The research concerned the volume and functionally related parameters including height, diameter at breast height and basal area.
Źródło:
Sylwan; 2012, 156, 12; 902-907
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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