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Wyszukujesz frazę "oak tree" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Dynamika powstawania pęknięć i listew mrozowych na wybranych drzewach w parkach Poznania
Autorzy:
Dziurzyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1022019.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
parki miejskie
uszkodzenia drzew
listwy mrozowe
platan
Platanus
pekniecia mrozowe
Poznan
Quercus
dab
drzewa
frost crack
frost rib
plane−tree
oak
Opis:
Detailed measurements of the frost crack width were made in selected trees during two subsequent winter seasons. Also frost ribs were measured. Such individual approach to generally known phenomenon of frost cracks enables its better understanding.
Źródło:
Sylwan; 2005, 149, 06; 40-44
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola sójki (Garrulus glandarius) w inicjowaniu przemian sukcesyjnych zbiorowisk leśnych z udziałem dębu (Quercus sp.)
Role of jay (Garrulus glandarius) in initializing successional changes in forest communities with the participation of oak (Quercus sp.)
Autorzy:
Olszewski, A.
Brzeziecki, B.
Powiązania:
https://bibliotekanauki.pl/articles/980357.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
zbiorowiska lesne
sukcesja roslin
dab
Quercus
zoochoria
sojka
Garrulus glandarius
acorn
jay
oak
ornitochory
seed dispersal
stand heterogeneity
tree succession
zoochory
Opis:
The ability of spatial expansion and conquering of new locations, suitable for growth, is one of the most important properties enabling different plant species (including forest trees) a permanent existence in a constantly changing (in space and in time) environment. In the course of evolution, plants developed several adaptations and mechanisms enabling them to capture new localities appropriate for life. The key role in this process is played by so called propagules, i.e. differently built spores, seeds and fruits. The main sources of forces and major transportation vectors for propagules are such mechanisms as: power of gravity (barochory), wind (anemochory), water (hydrochory), animals (zoochory) and man (antropochory). Among them, in case of tree species producing large seeds, containing bulky amounts of food resources, the most important role is played by zoochory. The special variant of zoochory is ornitochory, i.e. dispersion of plant propagules by birds. One of the best known and documented examples of ornitochory is dispersal of oak acorns by jays (Garrulus glandarius). The contemporary research shows that during a vegetation period one single bird is able to deposit even several thousends of acorns within the area of 10 to 100 ha. The dispersal distance in case of acorns distributed by jays is variable and depends on several factors, first of all, climatic conditions and degree of environmental heterogeneity. On average, acorns are distributed within a distance of several hundred meters from seed trees; sometimes they are disseminated at a distance of several (4−8, maximum 20) kilometers. As a rule, only a part of deposited acorns is uncovered and consumed by birds, thus at least some of them can germinate and produce new oak seedlings. It was also recently demonstrated that jays preferably put down acorns under the stand canopies composed by tree species other than oak, for instance, under Scots pine trees. Under favourable conditions, this initiates natural successional processes and leads to a significant conversion of tree stand composition. Considering a large scale and commonness of this phenomenon, it deserves an interest and attention, not in the case of natural forests only, but in the case of managed forests as well, in which the quasi−natural, successional processes, initiated by jays, can considerably contribute to a greater compositional and structural diversity of tree stands.
Źródło:
Sylwan; 2019, 163, 06; 479-88
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określanie wieku starych dębów
Estimation of the age of old oak trees
Autorzy:
Ufnalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1013012.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wiek drzew
okreslanie wieku
srednie przyrosty roczne
drzewa stare
Quercus
lesnictwo
dab
przyrosty roczne
drzewa lesne
quercus robur
quercus petraea
old oak trees
tree age
age estimation
Opis:
The age of old trees is often estimated only on the basis of trunk thickness. A more detailed method for estimation of the age of old oak trees is presented here, depending on species and environmental conditions. For oak trees growing singly or at forest edges, the mean annual ring width is over 2 mm, while in the forest interior ca. 1 mm for Quercus petraea, and 1.2−2.5 mm for Q. robur, depending on site fertility.
Źródło:
Sylwan; 2008, 152, 10; 36-40
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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