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Wyświetlanie 1-3 z 3
Tytuł:
Struktura wieku i zagrożenie zgnilizną drewna starych drzewostanów sosnowych
The age structure and the wood rot of old pine stands
Autorzy:
Bernadzki, E.
Powiązania:
https://bibliotekanauki.pl/articles/1026722.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
Pinus
zgnilizna drewna
drzewostany stare
sosna
struktura wiekowa
lesnictwo
drzewa lesne
pine
regeneration period
two−generation stand
multi−generation stand
wood rot
Opis:
In 31 oldest pine stands situated in central and eastern Poland the age within one stand ranged between 8 and 155, on average 10−40 years. These were the stands characterised with the continuity of the regeneration process, but also two−generation stands in which the generation gap between the two generations was 60−120 years. Multi−generation stands were uncommon and the regeneration process had a „wavy pattern”. The likelihood of wood rot occurrence in trees at the age of 200 years as calculated on the basis of a 690−tree sample (age between 84 and 235 years) is 60% on average, and on more fertile sites it exceeds 70%.
Źródło:
Sylwan; 2003, 147, 05; 3-12
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie wieku, płci oraz masy ciała zajęcy w warunkach niskiego zagęszczenia na Wyżynie Lubelskiej
Diversity of age, gender, and body mass of hares living in low density in the Lublin Upland
Autorzy:
Flis, M.
Powiązania:
https://bibliotekanauki.pl/articles/989783.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lowiectwo
zwierzeta lowne
zajace
masa ciala
struktura populacji
struktura wiekowa
struktura plciowa
Wyzyna Lubelska
brown hare
body mass
population structure
lublin upland
Opis:
The analysis of population density indicators and hunting exploitation of brown hare (Lepus europaeus) in the Lublin Upland (eastern Poland) hunting club indicates that these parameters reached low and very low level resulting in the reduction or suspension of hunting acquisition. Analysis of body weight of obtained hares indicates that despite the low density of the species, it does not differ significantly from the value of this parameter in other regions of the country at different levels of population density. Thus, achieved results are confirmation that the population density index does not determine hare body weight. Statistically significant differences in body weight in the group of juveniles and adults regardless of gender were found, and there were no clear and statistically significant differences between males and females, both in the group of juveniles and adults (tab.). Analysis of the age and gender structure among obtained hares (fig. 2 and 3) shows a clear dominance of adult animals, both males and females. These results confirm that in spite of the low population density, the estimated possibilities of the reproductive potential are high, and the cause of a population decline and continued low density are the factors from the outside of the population.
Źródło:
Sylwan; 2015, 159, 07; 579-585
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda określania średniego wieku gospodarstwa w przerębowo-zrębowym sposobie zagospodarowania lasu
Method of assessment average age of forest range in shelter wood cutting system
Autorzy:
Banaś, J.
Zięba, S.
Bujoczek, L.
Zygmunt, R.
Drozd, M.
Powiązania:
https://bibliotekanauki.pl/articles/989920.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
gospodarstwa lesne
gospodarstwa przerebowo-zrebowe
drzewostany
struktura drzewostanu
struktura wiekowa
klasy wieku
sredni wiek drzewostanu
wiek odnowienia
odnowienia podokapowe
age class structure
average age of stands
regeneration class
upgrowth
Opis:
The study describes a new method of assessing the average age of the forest range with significant share of stands in the regeneration class. In proposed method, average age of stands in regeneration layer is calculated as a mean age of tree layer as well as layer of upgrowth, recruitment and saplings weighed by these layers fraction. Example of calculation of average age was performed for 7 ranges located in Kotlina Kłodzka (SW Poland) with total area of 48 653 ha. Average age of stands calculated by proposed method vary from 62 to 73 years and is lower in comparison to average age calculating according to current regulations from 5 to 14 years. Proposed method of calculation the average age of stands in shelter wood cutting system takes into account composed structure of stands in regeneration period by using age and share of all trees generation in stand.
Źródło:
Sylwan; 2015, 159, 09; 732-739
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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