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Wyszukujesz frazę "height distribution" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Struktura naturalnego drzewostanu buczyny karpackiej w Tatrach na tle naturalnych buczyn z innych masywów Karpat
Structure of natural stand of a carpathian beech forest in the Tatra mountains compared with natural beech stands from other parts of the Carpathian
Autorzy:
Szwagrzyk, J.
Sułowski, W.
Skrzydłowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1018691.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Tatry
Karpaty
lesnictwo
drzewostany naturalne
struktura drzewostanu
buczyna karpacka
canopy stratification
diameter distribution
height distribution
mixed temperate forests
natural stands
Opis:
The aim of this study was to compare the structure of newly found remnant of natural beech forest in Suchy Żleb in the Tatra mountains with the structure of natural tree stands in other parts of the Carpathians. In the sample plot of the size of 1 ha the stand basal area amounted to 36.7 m2; of that, 42.7% was beech, 37.4% silver fir, 19.8% Norway spruce, and 0.1% sycamore maple. In the units of volume silver fir was the most important tree in the stand (47%), while the share of beech was only 33%; the total wood volume of live trees was equal to 446.8 m3/ha. Tree number was equal to 442, among them 327 beeches, 73 silver firs and 41 Norway spruces. Number of snags was 26, and their volume 26.16 m3. Total amount of coarse woody debris was 159 m3 per hectare. Sub−canopy layer was dominated by beech, the middle layer of tree stand was a mixture of all three species, and the highest canopy layer consisted only of spruce and fir. The analyzed stand had biomass accumulation slightly below the average for the natural mixed beech forests of the Carpathians, probably because of selective tree cutting in the past. Because Suchy Żleb is the only remnant of natural stand in the montane zone of the Tatra mountains, it is very valuable as an object for comparisons with natural beech stands growing in other ranges of the Carpathians.
Źródło:
Sylwan; 2006, 150, 09; 3-15
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urządzanie lasu w Polsce po drugiej wojnie światowej w świetle źródłowych publikacji Sylwana. Część III. Regulacja i planowanie w gospodarstwie leśnym
Forest management in Poland after the Second World War in the light of source publications from 'Sylwan' journal. Part III. Regulation and planning in forest enterprise
Autorzy:
Magnuski, K.
Jaszczak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1013144.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
okres powojenny
historia
Polska
planowanie
uzytkowanie lasu
lesnictwo
regulacja uzytkowania rebnego
uzytkowanie rebne
urzadzanie lasu
stand structure
diameter distribution
height distribution
common yew
nature protection
Opis:
The paper presents the stand structure in the "Zdroje" common yew nature reserve in Szczecin. In 2006 the stand was built by 1848 trees that belonged to 14 species. Scots pine was the most numerous species (1067 trees). There were also 533 common yews. The other species were represented by 1−76 specimens. The diameter structure of six the most important species as well as the height structure of a common yew were analysed. Changes in the height structure of a common yew over 28 years were presented as well. No natural regeneration of common yew was observed.
Źródło:
Sylwan; 2008, 152, 08; 3-16
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura drzewostanu w rezerwacie cisowym "Zdroje" w Szczecinie
Stand structure in the 'Zdroje' common yew nature reserve in Szczecin
Autorzy:
Friedrich, S.
Powiązania:
https://bibliotekanauki.pl/articles/1013127.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Taxus baccata
struktura populacji
populacje roslin
rezerwaty przyrody
wysokosc drzew
struktura grubosci
grubosc
struktura wysokosci
lesnictwo
cis
struktura drzewostanu
rezerwat Zdroje
stand structure
diameter distribution
height distribution
common yew
nature protection
Opis:
The paper presents the stand structure in the "Zdroje" common yew nature reserve in Szczecin. In 2006 the stand was built by 1848 trees that belonged to 14 species. Scots pine was the most numerous species (1067 trees). There were also 533 common yews. The other species were represented by 1−76 specimens. The diameter structure of six the most important species as well as the height structure of a common yew were analysed. Changes in the height structure of a common yew over 28 years were presented as well. No natural regeneration of common yew was observed.
Źródło:
Sylwan; 2008, 152, 08; 25-34
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena przydatności wybranych funkcji do modelowania rozkładu pierśnic w drzewostanach olszy czarnej (Alnus glutinosa (L.) Gaertn.)
Evaluation of usefulness of selected functions for modeling distribution of breast height diameter in black alder stands (Alnus glutinosa (L.) Gaertn.)
Autorzy:
Orzeł, S.
Pogoda, P.
Ochał, W.
Powiązania:
https://bibliotekanauki.pl/articles/988989.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany olszowe
struktura grubosci
olsza czarna
Alnus glutinosa
piersnice drzew
rozklad piersnic
rozklad teoretyczny
aproksymacja
modelowanie
funkcja gestosci prawdopodobienstwa
test Kolmogorowa-Smirnowa
diameter at breast height
diameter distribution
probability density function
kolmogorov−smirnov test
Opis:
We evaluated the usefulness of ten theoretical probability density functions for the approximation of the breast height diameter distributions in managed alder stands growing in the western part of the Sandomierz Basin (southern Poland). The study material consisted of measurement results for 22,530 alders obtained for 844 circular sample plots, established in 163 stands aged 6−89. In the area of particular stands, from 2 to 10 age−dependent circular sample plots sized 0.01−0.10 ha were systematically arranged. We evaluated the following theoretical probability distributions: normal (N), double normal (P−N), Johnson SB (J), Weibull (W), beta (B), Burr (Bu), gamma (G), log−normal (L−N), log−logistic (L−L) and Birnbaum−Saunders (B−S). Additionally the usefulness of the W, B, Bu, G, L−N, L−L and B−S distributions with omitted location parameter was tested. The goodness−of−fit of each probability density function was assessed based on the Kolmogorov−Smirnov statistic, the root mean square error and ranks established on their basis. It was found that DBH distribution of majority stands is characterized by right−sided asymmetry and negative kurtosis. It was showed that the best distribution for the breast height diameter structure approximation of alder stands is the Johnson SB (J) distribution. To describe the frequency of thickness, normal (N) and log−logistic (L−L) distribution should not be used. Elimination of location parameter significantly affects usefulness of probability density functions to modeling empirical distributions of breast height diameter. Gamma and Burr distributions with omitted location parameter gave the best results in description the frequency of breast height diameter. In certain situations, these distributions can also be used to describe the structure of breast height diameter of alder stands.
Źródło:
Sylwan; 2017, 161, 02; 101-113
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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