Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Nitrate reductase activity in chosen mosses: a case of study in skalny colliery waste tip / Aktywność reduktazy azotanowej u wybranych mchów na przykładzie hałdy powęglowej skalny

100%

Krywult M. , Salachna A. , Chmura D. , Żarnowiec J.

Chemistry-Didactics-Ecology-Metrology

2013

tom 18

nr 1-2

61-68

Two species of mosses in relation to nitrogen metabolism were examined. This subject is little known in this group of plant. Investigations of nitrate reductase activity in green tissues of Brachythecium rutabulum (Hedw.) Schimp. and Atrichum undulatum (Hedw.) P.Beauv. were performed. The study was conducted in two localities: heavy contaminated waste tip Skalny located in Upper Silesia, and Blonia City Park in Bielsko-Biala which place was chosen as a control area. For both species high activity of the enzyme was detected. The nitrate reductase activity varied between 99 to 9093 nmol per g dry mass per hour for B. rutabulum and 265 to 5135 nmol per g d.m. per hour of nitrite synthesized for A. undulatum respectively on Skalny waste tip. In the control area the results varied between 747 to 1077 for B. rutabulum and 171 to 518 nmol per g d.m. per hour of nitrite synthesized for A. undulatum, respectively. The differences were statistically significant only between the two species but not between habitats probably due to high dispersion and small amount of replications. The levels of nitrate and nitrite in stream water in both areas were also measured. In the Skalny waste tip there were high and reached 1.66 mg · dm-3 of nitrite and 65 mg · dm-3 of nitrate, respectively. In the control area these amounts were lower and reach zero level for nitrite and 4.5 mg · dm-3 of nitrate, respectively.

Dwa gatunki mchów badano pod kątem asymilacji azotu. To zagadnienie jest mało poznane u tej grupy roślin. Przeprowadzono badania aktywności reduktazy azotanowej w zielonych tkankach Brachythecium rutabulum (Hedw.) Schimp. i Atrichum undulatum (Hedw.) P.Beauv. Badania zostały wykonane w dwóch miejscach: na hałdzie powęglowej Skalny na Górnym Śląsku i w parku w dzielnicy Błonia w Bielsku-Białej, które zostało wybrane jako miejsce kontrolne. Dla obu gatunków stwierdzono wysoką aktywność enzymu. Aktywność reduktazy azotanowej wahała się od 99 do 9093 nmol na g suchej masy na godzinę dla B. rutabulum i 265 do 5135 nmol na g suchej masy na godzinę azotynu syntetyzowanego u A. undulatum na hałdzie Skalny. W miejscu kontrolnym wyniki wahały się od 747 do 1077 dla B. rutabulum i 171 do 518 nmol na g sm/h u A. undulatum. Różnice były statystycznie znaczące tylko pomiędzy gatunkami, ale nie pomiędzy typem siedliska prawdopodobnie ze względu na wysoką dyspersję i małą liczbę powtórzeń. Zmierzono także poziom azotanów i azotynów w strumieniu wody w obu miejscach. Na hałdzie Skalny zawartość była wysoka i osiągnęła odpowiednio: 1,66 mg dm-3 azotynu oraz 65 mg dm-3 azotanu. W miejscu kontrolnym wartości te były niższe i osiągnęły odpowiednio poziom zerowy dla azotynów i 4,5 mg dm-3 dla azotanu.

Dendroflora wybranych parków miejskich w Bielsku-Białej

63%

Pietraszko E. , Żarnowiec J. , Klama H. , Adamaszek M. , Kozak M. , Kóska M. , Owczarz S. , Sawa M.

Polish Journal of Materials and Environmental Engineering

2023

tom 6(26)

13-24

Parks are undoubtedly areas of great natural value to the city, mainly due to the ecosystem services and ecological functions they provide. An important component of every park is its forest stand. In this paper, the study of dendroflora were conducted in seven parks of Bielsko-Biała. The parks were created in the 19th century. They are located mainly in the central part of the city. This paper presents the results of the study on the species composition as well as the quantity of each species in the parks. Furthermore, basic dendrometric characters such as tree height and circumference at the breast height were also analyzed. A total of 615 trees belonging to 32 species from 21 genus and 12 families were found in parks. There was a dominance of deciduous trees (28 species) over conifers (5). The largest number of examined trees was in Strzegowski Park, and the smallest in Park at Komorowicka Street. In turn, the largest number of species was in Słowacki Park, and the smallest in the Park near to Zipser villa. In addition, the presence of 144 specimens with monumental dimensions was indicated. Most of the park trees had dimensions in the range of 200–300 cm in terms of circumference at the breast height and height in the interval 20–30 m. Typical trees that occur in the natural forest communities of Poland were noted in the parks. These include: oaks, beeches, ash trees, hornbeams, alders, maples or lindens. Some of them are often selected for planting in parks and avenues. Of the 32 tree species, 10 were most numerous: Tilia cordata, T. platyphyllos, Acer platanoides, A. pseudoplatanus, A. saccharinum, Fraxinus excelsior, Alnus glutinosa, Carpinus betulus, Aesculus hippocastanum and Quercus robur. Among examined species, alien invasive species (Robinia pseudoacacia and Quercus rubra) were noted. They are classified as medium invasive plants. In this paper the authors pointed out the parameters that can affect the number of trees included in the study, for example: minimum circumference at the breast height, park area, age of the forest stand and local condition. Therefore, further research regarding the dendroflora in parks of Bielsko-Biała should be expanded with additional analyses, especially to determinate full species composition and changes in the stand.