Wyniki wyszukiwania - Biblioteka Nauki

1

Contemporary habitat and floristic changes in the Sudeten Mts.

100%

Fabiszewski J. , Brej T.

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nr 3

2

Effect of ecological factors on the zonation of wetland vegetation

100%

Hrivnak R.

Acta Societatis Botanicorum Poloniae

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2005

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tom 74

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nr 1

EN

The influence of some ecological factors to aquatic and marsh vegetation was studied during 1998-2000. Three basic vegetation units (Caricetum buekii, Typhetum latifoliae and Ceratophylletum submersi) and three transitional communities were defined in the belt transect, which was established along the moisture gradient. The content of available soil nutrients in individual vegetation types differed only in case of the Ceratophyllum submersum community, where a higher magnesium and nitrogen content accumulated due to specific environmental conditions. Water and marsh vegetation is usually characterised by a pronounced spatial and temporal dynamics. In the studied area, its zonation was dependent from the terrain morphology, and both depth and duration of floods. The fluctuation of ground and surface water table during a three-year period caused changes in the occurrence and cover of several species (e.g. Carex buekii, Typha latifolia, aquatic macrophytes). Pronounced changes in the cover of some species occurred even within a single vegetation season due to the long-term sink of water table below the ground surface.

3

Contemporary floristic changes in the Karkonosze Mts

100%

Fabiszewski J. , Wojtun B.

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tom 70

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nr 3

4

The relative abundance and importance of some grass species in the weed flora in cultivated fields in the Wysoczyzna Siedlecka [Central Poland]

80%

Skrzyczynska J. , Ciosek M. T.

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nr 2

5

Przekształcenia flory roślin naczyniowych Uroczyska Szczawin po 35. latach (Polska Środkowa)

70%

Daraz I. , Grzelak P. , Zielinska K. , Grzelak A.

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tom 07

EN

The vascular flora of the Szczawin forest complex was studied from 2007 to 2011. The results were compared to those of a previous study carried out from 1971 to 1976. The Szczawin forest complex is located north-east of Zgierz in central Poland. It contains the Grądy nad Moszczenicą nature reserve, which was established to preserve the oak-hornbeam forests with their rare protected plant species. There have been large changes in the 35 years since the first study. Currently, 307 plant species are found in the area. However, only 68% of the species found in the first study were found again in the second study. Of 22 protected species found in the first study, only 10 were found in the second. The share of alien species has also increased. With regards to native species, the share of non-forest native species has increased.

6

Trwałość i plonowanie traw pastewnych w fenologicznie zróżnicowanych mieszankach łąkowych

61%

Wrobel B. , Jankowska-Huflejt H. , Zastawny J.

Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin

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2003

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tom 225

53-64

PL

Badania prowadzono w latach 1990–1998 w Falentach na glebie mineralnej o odczynie obojętnym. Doświadczenie założono w układzie podbloków z dwoma czynnikami: mieszanka (4 typy fenologiczne) i nawożenie (3 poziomy nawożenia azotem: 120, 180 i 240 kg/ha, na tle jednolitego nawożenia P i K). Komponentami poszczególnych mieszanek były: Dactylis glomerata L., Festuca arundinacea Schreb., F. pratensis Huds., Arrhenatherum elatius (L.) P.B., Phleum pratense L., Bromus inermis Leyss., Poa pratensis L., F. rubra L. i Trifolium pratense L. Najlepiej średnio w całym okresie plonowała mieszanka średnio wczesna (12,2 t s.m. z ha), nieco słabiej mieszanka późna (11,6 t s.m. z ha) i średnio późna (11,3 t s.m. z ha), najsłabiej zaś mieszanka wczesna (10,8 t/ha). Największe plony, bo około 20 t s.m. z ha, uzyskano w pierwszym roku badań. W następnych latach obserwowano systematyczny spadek plonowania aż do poziomu 6–7 t s.m. z ha (lata 1997–1998) niezależnie od poziomu nawożenia azotem. Udział gatunków i odmian w mieszankach odbiegał od założonego przy wysiewie. W 9. roku użytkowania w mieszance wczesnej dominowała wiechlina łąkowa (ponad 40%). Licznym gatunkiem w mieszance średnio późnej (30,1%) i w mieszance późnej (44,6%) była stokłosa bezostna, a w mieszance średnio wczesnej kostrzewa trzcinowa (41,7%). Stwierdzono całkowity zanik koniczyny łąkowej i jednocześnie pojawianie się gatunków obcych traw i ziół, w tym w dużych ilościach mniszka lekarskiego.

EN

During the years 1990–1998 a plot experiment was carried out at Falenty on mineral soil. The experiment was established in split-plot design with two factors: grass mixture (4 phenological types) and fertilization (3 levels of N fertilization: 120, 180 and 240 kg/ha with stable P and K fertilization). The components of mixtures were: Dactylis glomerata L., Festuca arundinacea Schreb., F. pratensis Huds., Arrhenatherum elatius (L.) P.B., Phleum pratense L., Bromus inermis Leyss., Poa pratensis L., F. rubra L. and Trifolium pratense L. The highestyields of DM for the whole period were observed in case of the moderate early mixture (12,2 t ha-1), a bit lower for the late mixture (11,6 t ha-1) and the moderate late mixture (11,3 t ha-1). The lowest yields were in case of an early mixture (10,8 t ha-1). The highest yields, about 20 t of DM per ha, were obtained in the first year of study. In the next years systematic decrease of yielding was observed to the level of 6–7 t DM per ha (1997–1998), independently on the level of N fertilisation. The share of grass species and their varieties in the mixtures differed from the structure established at sowing. In the 9th year of utilisation meadow grass (Poa pratensis L.) dominated in the early mixture (over 40%). Next frequent species was smooth brome-grass (Bromus inermis Leyss.): 31,1% in the moderate late mixture and 44,6% in the late mixture. In the moderate early mixture numerous plants of F. arundinacea (41,7%) were observed. A total retirement of red clover (Trifolium pratense L.) from a sward was stated together with appearance of strange species of grasses and herbs, including large amounts of Taraxacum officinale Web.