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Wyszukujesz frazę "tree stability" wg kryterium: Wszystkie pola


Wyświetlanie 1-3 z 3
Tytuł:
Wskaźniki stabilności drzew w drzewostanach sosnowych uszkodzonych przez wiatr
Indices of tree stability in Scots pine stands damaged by wind
Autorzy:
Jelonek, T.
Walkowiak, R.
Jakubowski, M.
Tomczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/993204.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
uszkodzenia drzew
wiatry
drzewa lesne
sosna zwyczajna
Pinus sylvestris
stabilnosc
smuklosc drzew
srodek ciezkosci
dlugosc korony
objetosc korony
scots pine
stability
wind
damage
Opis:
The aim of the study was to determine the effect of selected tree stability indices described by individual biometric characteristics on the formation of their wind resistance. The analysis of tree stability was based on easily measurable tree traits, such as height, breast height diameter, crown parameters as well as the centre of gravity and slenderness factor. Investigations were conducted in wind−damaged Scots pine stands, where a total of over 600 trees were measured, of which almost 40% specimens were wind−broken. Results indicate that a significant role in the modification of tree stability is played by the slenderness factor, the location of the centre of gravity and crown parameters. Most of the analysed traits are strongly cross−correlated. However, these are slenderness and crown length that describe tree stability the best.
Źródło:
Sylwan; 2013, 157, 05; 323-329
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka wybranych cech morfologicznych drzew w dojrzałych drzewostanach sosnowych eksponowanych na działanie wiatru
Characteristics of selected morphological traits of trees in mature pine stands exposed to the action of wind
Autorzy:
Tomczak, A.
Jelonek, T.
Pazdrowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/990957.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
wiatry
drzewa lesne
sosna zwyczajna
Pinus sylvestris
stabilnosc
cechy morfologiczne
piersnice drzew
wysokosc drzew
wysokosc osadzenia korony
srednica korony
dlugosc korony
wind
tree stability
biometry
scots pine
Opis:
The paper presents variability in morphological traits of trees in mature Scots pine stands exposed to wind. The analysed parameters included breast height diameter, tree height and length, diameter, lateral area and crown base area. Except for the crown base area and crown diameter, values of the other traits increased with an increase in the distance from the edge of the stand. Crown diameter in trees with average exposure to wind was smaller than diameters of trees growing on the edge of the stand (strong exposure) and within the stand (weak exposure).
Źródło:
Sylwan; 2014, 158, 03; 183-191
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekologiczne konsekwencje hodowli drzew w różnym zagęszczeniu III. Stabilność drzewostanu, fitoklimat i różnorodność biologiczna
Ecological consequences of silviculture at variable stand densities. III. Stand stability, phytoclimate and biodiversity
Autorzy:
Jagodziński, A.M.
Oleksyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1011879.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wiezba drzew
zageszczenie poczatkowe
drzewostany
roznorodnosc biologiczna
mikroklimat
lesnictwo
ekologia lasu
stabilnosc drzewostanu
zageszczenie roslin
stand density
spacing
tree competition
forest ecology
stand stability
microclimate
biodiversity
review
Opis:
The main goal of this review was to characterize ecological consequences of growing trees at variable stand densities. We analyzed the influence of stand density on its mechanical and biological stability, diversity and biomass of understory plants and microclimate conditions (e.g. temperature, humidity, light, etc.). Higher stand density results in higher susceptibility to wind and snow damage, due to changes in height to diameter ratio (tree slenderness). The mechanical stability of stands may be promoted by silvicultural activities such as light thinning applied before growth stagnation. In addition, the reduction of stand density during stand development may increase biomass allocation to coarse roots that stabilize trees in the soil. High tree density may increase stand susceptibility to pathogens and insects and thus increase tree mortality. Trees growing at higher density (with higher intraspecific competition) may allocate less assimilates for defense against herbivorous insects and pathogens. The effect of tree density on stability of multi−species stands is inconclusive, since such studies were only occasionally undertaken. Since tree density influences light conditions (mainly before canopy closure), there is a negative relationship between stand density and herbaceous species diversity and biomass. Based on the published data, we summarized consequences of silviculture at different stand densities and proposed future directions of research needed to fill the gaps in current knowledge. Understanding the long−term ecological consequences of variable stand densities is essential for development of sustainable and stable forest ecosystems.
Źródło:
Sylwan; 2009, 153, 04; 219-230
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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