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Wyszukujesz frazę "las naturalny" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Dynamika naturalnych faz rozwojowych drzewostanów w Białowieskim Parku Narodowym
Dynamics of the natural development phases of stands in the Bialowieski National Park
Autorzy:
Miścicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/1008733.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
parki narodowe
Bialowieski Park Narodowy
drzewostany
las naturalny
fazy rozwojowe
zasobnosc drzewostanu
zageszczenie drzew
odnowienia lasu
przyrost miazszosci
przyrost biezacy
dynamika drzewostanu
natural forest
regeneration
sample plot
standing volume
change
Opis:
The aim of the research was to determine the current changes occurring in the natural forest using the classification based on the natural phases of stand development. The oldest part of the Białowieski National Park, formerly known as the Strict Reserve, was the object of the study. Material was collected from temporary sample plots (460 ones both in 1995 and 2005) and 160 permanent sample plots (in the years 2000, 2002 and 2004). Leibundgut’s classification was used to determine the natural development phases. All of them occurred in the Białowieski National Park in variable proportions, and this structure changed during the study period. They differed in terms of standing volume, tree density, total tree height of regeneration, current volume increment, losses and changes in standing volume. The regeneration of stands preceded in four different ways – in open areas, under the overstory of reduced closure, in small gaps or continuously when replacing separate dead trees.
Źródło:
Sylwan; 2012, 156, 08; 616-626
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lasy falowe, czyli o niezamierzonym lecz nieprzypadkowym podobieństwie pomiędzy rębnią Wagnera i lasami naturalnymi
Wave forests – not intended but not accidental similarity between Wagners Blendersaumschlag silvicultural system and natural forests
Autorzy:
Bolibok, J.
Powiązania:
https://bibliotekanauki.pl/articles/1035857.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany
rebnie brzegowo-smugowe
odnowienia lasu
hodowla lasu
inicjowanie odnowien
lasy falowe
las naturalny
struktura przestrzenna
lesnictwo
wave forest
wave−regenerated forests
shimagare forest
wagner's blendersaumschlag silvicultural system
natural forests
Opis:
A characteristic spatial structure of natural forests called „wave forest” or „Shimagare forest” is very similar to structure which is shaped by silvicultural system invented by Christopher Wagner. This review presents regions of occurrence, mechanisms of arising and maintenance of mentioned natural forests and compares them with theory and praxis of Wagner's Blendersaumschlag.
Źródło:
Sylwan; 2003, 147, 10; 16-24
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognoza rozwoju drzewostanów lasu naturalnego z wykorzystaniem modelu według klas wymiarów
Forecast of the development of natural forest resources using a size-class growth model
Autorzy:
Gazda, A.
Miscicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/972934.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany
buk zwyczajny
Fagus sylvatica
Abies alba
modele wzrostu
las naturalny
prognozowanie rozwoju
Roztocze
leśnictwo
Bukowa Góra
jodła pospolita
model wzrostu według klas wymiarów
silver fir
increment
mortality
Roztoczański National Park
European beech
Opis:
The size−class growth model is an empirical model applicable for the prediction of the dynamics of natural forest growth. It is based on the following assumptions: (1) changes in the forest condition are determined on the basis of the sum of the changes that take place in individual size classes, (2) the trees in a given class are represented by single average tree, (3) the calculation of the future tree density distribution in size classes (fig. 1) is the main element of the prediction, and (4) the future tree density distribution is estimated on the basis of the initial structure, actual growth and mortality of trees in individual size classes. The aim of the research was to develop a size−class growth model to be used for the preparation of a medium−term forecast of natural forest dynamics. The study site is located on the Bukowa Góra Mt in the Roztoczański National Park (SE Poland). For the analyses we took all uneven−aged stands (128 ha in total) composed mostly of silver fir and European beech. The material was collected on 65 permanent sample plots every five years in the period 1991−2011. Trees with the breast height diameter (DBH)8 cm were measured on each sample plot (500 m2), while smaller trees – on three smaller concentric plots. We calculated, separately for fir and beech, the relationship between the mortality of trees and their diameter (fig. 2), the relationship between the diameter increment of trees and their DBH (figs. 3−4), the rate of saplings (h=0.3−1.3 m) growth into the first DBH class (DBH=0.1−1.9 cm). On the basis of these data, we elaborated a size−class growth model that we used to predict the development of timber resources (trees with DBH 8 cm) at 10−year intervals in the period 2001− −2041. In 2011, the predicted average standing volume was lower than the one actually measured. The forecast indicated an increase in the average standing volume (fig. 5), a reduction in the volume of ingrowth (fig. 6), an increase in the proportion of beech in the standing volume and ingrowth (figs. 5 and 7) and the maintenance of a similar density structure (fig. 8) throughout the period 2001−2041. The low accuracy of the prediction after 10 years (in 2011) was caused by the difference between the predicted and actual values of tree growth and mortality in the period 2001−2011.
Źródło:
Sylwan; 2016, 160, 03; 207-218
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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