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Wyświetlanie 1-3 z 3
Tytuł:
Kwietnica okazała Protaetia speciosissima (Scopoli, 1786) (Coleoptera: Scarabaeidae) – chroniony gatunek saproksyliczny drzewostanów dębowych w Polsce
Flower chafer Protaetia speciosissima (Scopoli, 1786) (Coleoptera: Scarabaeidae) – protected saproxylic species of oak stands in Poland
Autorzy:
Plewa, R.
Hilszczański, J.
Jaworski, T.
Tarwacki, G.
Powiązania:
https://bibliotekanauki.pl/articles/1312844.pdf
Data publikacji:
2014
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
entomologia lesna
drzewostany debowe
owady saproksyliczne
gatunki chronione
kwietnica okazala
Protaetia speciosissima
wystepowanie
saproxylic beetles
oak stand
forest strata
yellow pan traps
vertical distribution
Opis:
The paper presents the results of our studies on the preferences of the flower chafer, Protaetia speciosissima (Scopoli, 1786). The studies were carried out in 2009-2010 in the Forest Districts of Hajnówka, Krotoszyn, Łochów, Piñczów, and Puławy, located in various regions of Poland. Barrier traps consisting of a Moericke's trap and a Malaise's trap combined with a barrier of fine net were used to collect beetles. Traps were installed at two heights in over 100 years old oak stands, with the upper level in the canopy layer (mean height of 20.5 m) and the lower level adjacent to the tree trunk (mean height of 4,5 m). During two-year study, we collected a total of 328 specimens of P. speciosissima, 299 from the upper- and 29 from the lower forest layer. Thus, we confirmed strong preferences of the adult of P. speciosissima for the canopy layer in oak stands. Furthermore, our observations on phenology indicate that the second half of June and all of July are the months with the highest population density of P. speciosissima. This paper also proposes modes of action for conservation of the species.
Źródło:
Leśne Prace Badawcze; 2014, 75, 3; 225-229
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czy naturalne procesy ekologiczne w juwenilnej fazie rozwoju drzewostanu założonego sztucznie różnicują jego strukturę przestrzenną?
Do natural processes at the juvenile stage of stand development differentiate the spatial structure of trees in artificially established forest stands?
Autorzy:
Szmyt, J.
Korzeniewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1317220.pdf
Data publikacji:
2014
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
ekologia lasu
drzewostany sosnowe
drzewostany debowe
wiezba poczatkowa
procesy ekologiczne
wydzielanie sie drzew
drzewa lesne
sosna
dab
rozmieszczenie drzew w przestrzeni
piersnice drzew
wysokosc drzew
dlugosc korony
spatial indices
forest diversity
self-thinning
managed forests
Opis:
Structural diversity is one of the most interesting phenomena that have been studied by forest ecologists and practitioners. Amongst the different characteristics of forest structure, spatial diversity of trees and their attributes seem to be very important. The more spatially structured a population is, the higher its diversity in terms of size and species richness. Because most forests in Europe are managed and were artificially established, they are subjected to conversion processes turning them into more complex systems. The approach presented here aims at elucidating whether natural processes, such as self-thinning, can cause the self-differentiation of spatial structure in artificially planted stands. Our analyses focused on untended Scots pine and pedunculate oak stands in the juvenile phase of development and were based on spatially explicit structural indices for positioning and size differentiation (diameter, total height and crown length). The obtained results indicate that live trees were dispersed more or less regularly. Unlike the anglebased index, which mostly indicated randomness in tree location, a distance-based index showed clear regularity. We also found that the distribution of tree attributes auto-correlates to tree location as indicated by significantly lower index values compared to values resulting from random reassignment of the examined attributes. This low degree of spatial differentiation is further confirmed by the distribution of indices in differentiation classes. Our results allow us to conclude that, in the case of light demanding species (pine and oak), natural processes do not increase spatial diversity of the stand, although, both species showed a certain degree of deviation in this respect.
Źródło:
Leśne Prace Badawcze; 2014, 75, 2; 171-179
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poziom chlorofilu a i b w liściach krzewów podszytowych w grabowo-dębowych lasach lasostepu Ukrainy Zachodniej
The content of chlorophyll a and chlorophyll b in leaves of undergrowth species in hornbeam-oak forest stands of the forest-steppe zone in Western Ukraine
Autorzy:
Zaika, V.
Bondarenko, T.
Powiązania:
https://bibliotekanauki.pl/articles/1292298.pdf
Data publikacji:
2018
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewostany grabowo-debowe
podszyt
krzewy
liscie
chlorofil a
chlorofil b
poziom chlorofilu
lasostep
Ukraina Zachodnia
shrubs
plastid pigments
chlorophyll a
chlorophyll b
hornbeam-oak forest stands
forest-steppe zone of western
Ukraine
Opis:
In this study, the biosynthesis of the plastid pigments chlorophyll a and b was examined for the most common shrubs in hornbeam-oak forest stands of the Western forest-steppe zone of Ukraine. The characteristics of the pigments’ biosynthesis were determined in terms of plant species, vegetation period and growth conditions (under canopy cover and out in the open). The gathered data on the changes of the pigment complex with respect to the examined variables confirms the sensitivity of plastid pigment biosynthesis to environmental factors.
Źródło:
Leśne Prace Badawcze; 2018, 79, 1
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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