Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 12

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Mid-forest meadows have a high natural value, due to preserving unique meadow and ecotone biotopes, similar to the natural state. Due to their dissimilarity, they also had a considerable effect on the functioning of forest ecosystems they border. The aim of the study conducted in 2006-2010 in the Bukówka river valley was to assess the natural values of mid-forest meadows with the Oświt method [2000] based on 140 phytosociological records, to estimate the economic value by evaluating dry matter yield and to calculate the fodder value of sward. Richness and floristic diversity of mid-forest meadows was observed, resulting mainly from the mosaic character of habitats and intensity of use. The studied communities from the classes Phragmitetea, Potametea, Lemnetea, as well as Molinio-Arrhenatheretea generally presented a poor quality, due to a very late time of cutting and excessive moisture of most habitats.
Phytosociological and habitat studies of rush communities were conducted in the Noteć Bystra and Noteć Leniwa river valley in the years 2010–2014. These communities are of varied nature value and form valuable ecosystems of high landscape value. Their development, floristic diversity, nature and agricultural value are connected primarily with their moisture content, resulting from the habitat mosaic and land use intensity. The calculated floristic diversity index (H’) ranged from 1.2 to 2.7, while valuation results provided by the method proposed by Oświt showed that communities with moderately high and high nature value predominate in the area. Most examined communities are of poor and mediocre economic and utility value, as evidenced by the calculated fodder value score FVS=1.7–4.1.
The aim of this study was to determine floristic diversity, the chemical composition, nature value and energy value of selected sedge communities in view of habitat conditions in the Noteć valley. This study was based on a total of 46 relevés prepared according to Braun-Blanquet. The identified communities were represented by common plant associations, both natural or semi-natural. They comprised mainly vegetation of meadows excluded from agricultural use, on fresh and partly moist and very moist soils, of weak acid and neutral reaction. Analysed communities had moderate or high nature value. Sedges and Cyperaceae predominated in their structure, with the greatest share of Caricetum lasiocarpae (76%) and the lowest share of Caricetum distichae (44.6%). No Fabaceae were reported in any of the two plant associations, while herds were found in all associations. The greatest higher heating value and lower heating value were found for communities with Carex lasiocarpa and Carex disticha.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 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.