Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 95

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 5 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  bor sosnowy
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 5 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Fragmenta Faunistica
|
1993
|
tom 36
|
nr 01
5-11
The paper discusses the major aims and the scope of studies of animal communities inhabiting pine forests in Poland. The studies were earned out by the Institute of Zoology of the Polish Academy of Sciences in the years 1986-1990. They are a continuation of a broader research programme concerned with the structure of fauna communities of the most common habitat types in Poland, including both natural habitats and those transformed by man.
Multidirectional hypothesis of the secondary succession of fauna is considered. It contains five types of succession: creative, stabilising, rise-and-fall, regressive and restorative. The verification of these hypotheses during pine forest development is based on changes in the number of species, their abundance, the structure of the taxocoenes, actual and potential species diversity. 27 taxons (families or orders) with 1247 species occurring in Białowieża primeval pine forest served as a material for comparisons. They represent all main trophic types of the fauna: phytophages, predators, parasites and saprophages among invertebrates, and also birds and mammals. After the clear cutting of trees, no empty place appears with regard to fauna, which is the richest at this stage. The multidirectional character of the succession of fauna is predominant. Many indices decrease their values in the mature forest. Ecosystem stability is ensured by the better adapted forms while the potential diversity is not fully realised.
Paper presents some geobotanical and soil research, which are carried out in pine forest, situated in the five geographical regions of Poland (Wielkopolska, Bory Tucholskie, Puszcza Biała, Puszcza Białowieska and Roztocze). The aim of the study was to make a phytosociological diagnosis, estimation of soil condition and analysis of phytocenoses for zoocenological purposes. Studied plant communities arc represented by two regional association: Leucobryo-Pinetum and Peucedano-Pinetum and two types of soil: podzolic and rusty soil belonging to the podzolic earthe. Physical and chemical soil properties, phytosociological data, as well as results of floristic composition of different regeneration stage of pine forest are presented.
The paper contains a description of the area of study and methods of collecting material in pine canopies in the Berezinsky Biosphere Reserve. The results of earlier studies by Byelorussian zoologists, who cut pine branches to collect, have been compared to the Moericke's pitfall traps method. The considerable d: (Terences in abundance observed suggest that in order to obtain a relatively accurate picture of tree canopy fauna both methods should be used on a complementary basis.
A research on the nematofauna of Vaccinia myrtilli-Pinetwn pine forests has been done in four forest areas located in different zoogeographical regions of Poland. Species composition, constancy, density and dominance structure of Nematoda communities have been analysed. 49 Nematoda species have been identified. 5 of which were not previously recorded in Poland.
The structure of Enchytraeidae communities of Leucobryo-Pinetum and Peucedano-Pinetum pine forests was analysed. One community-type was registered. Differences in species composition and dominance structure related to regional phytosociological diversity and limiting influence of anthropogenous pressure on community density were observed.
The earthworms occurrence in pine forests was analyzed. The communities of earthworms in studied areas are characterized by poor species composition and low density. D. octaedra was the dominant.
Species composition, abundance and variations of dominance structure of communities of spiders Inhabiting tree canopies have been studied in forest stands of different ages situated in pine forest sites belonging to two regional associations: the subcontinental pine forest (Puszcza Białowieska, Puszcza Biała) and the suboceanic pine forest (Bory Tucholskie). The study has revealed that the greatest differences in both species composition and abundance of spider communities are associated with the age of the forest stand. The following species were most frequent and abundant in the tree canopy spider communities studied: Atea Sturmi, Euryclubiona subsultans, Theridion tinctum, Hellophanus dubius.
A decrease in the degree of age differentiation of forests stands in Puszcza Białowieska is accompanied by a 50-60% reduction in the number of species of zoophages or sucking and chewing phytophages and a 10-25% reduction in the number of xylo- and cambiophages. The preservation of age differentiation favours the development of useful fauna with an inconsiderable increase in the number of secondary pest species. With the age of the stands becoming uniform (the forest getting older), faunal diversity is usually reduced, while the degree of its utilisation in the organisation of the forest zoocenosis is increased.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 5 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.