Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  turzyca
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
EN
Using multiple classification approach to examine plant traits response to grazing and fencing (as without access to grazing) is rare. Here we used multiple classification approach to examine plant diversity, productivity and species traits response to grazing and fencing over a three-year period on the eastern part of the Qing-Hai Tibetan Plateau. The results showed that most common species response to the fence was poorly noticeable. The fencing meadows compared to those under long-term free grazing are characterized by significantly higher total species richness, but species richness declined with sampling years gradually, regardless of grazing or fencing. The correlation showed that species richness was negatively associated with mean annual temperature significantly, suggesting that abiotic factors (e.g. annual temperature) could also play important roles in driving species richness in this subalpine meadow. Total aboveground biomass was not associated with mean annual temperature and rainfall. The fencing meadow demonstrated higher community aboveground biomass relative to the grazing ones, especially the abundance of legume and graminoids increased, while the proportions of sedge decreased, suggested that grazing disturbance favours the increase of reproductive success of sedge (e.g. Kobresia humilis) in this subalpine meadow. Growth form-based analyses combined with canopy height categories should be recommended to reveal general rules and mechanisms relating to grazing.
PL
Trawy ozdobne i turzyce powinny na dobre zagościć w miastach. Warto im się przyjrzeć bliżej i dobrze je wykorzystać.
EN
Grass is an important part of the contemporary architecture of urban spaces. This research was conducted in 2009–2013 in Rzeszów to estimate the surface area of grass lawns, planted ornamental grasses, and other grasses planted and maintained by the Management of Urban Greenery for their decorative value at various locations. Grasses account for approximately 40% of the total green areas in Rzeszów with the highest proportion along roadways. The botanical compositions are dominated by perennial ryegrass (Lolium perenne), red fescue (Festuca rubra) and smooth meadow-grass (Poa pratensis). A total of 11 grass species were catalogued in the compositions along roadways, strips of urban greenery, parks and the Rzeszów White Garden, among which the most popular were blue fescue, sea lyme grass and Chinese silver grass. Ornamental grasses like blue fescue (Fesatuca cinerea), hakone grass (Hakonechloa macra), and sedge (Carex sp.) are the most complementary additions to trees and shrubbery. Other varieties of taller grasses include sea lyme grass (Leymus arenarius), reed mannagrass (Glyceria maxima), and Chinese silver grass (Miscanthus sinensis). These plants feature decorative leaves, inflorescences, and circular and semi-circular shapes. Floristic compositions also have additional decorative elements such as statues, gravel or stones.
PL
Współcześnie w architekturze przestrzeni miejskiej ważne miejsce zajmuje roślinność trawiasta. W latach 2009–2013 w Rzeszowie zostały przeprowadzone badania mające na celu przedstawienie powierzchni trawiastych i nasadzeń z traw ozdobnych urządzanych i pielęgnowanych przez Zarząd Zieleni Miejskiej z uwzględnieniem ich lokalizacji oraz walorów dekoracyjnych. W ogólnej powierzchni terenów zieleni Rzeszowa powierzchnie trawiaste stanowią około 40%, w tym największą zajmują w pasach drogowych. W składzie botanicznym dominują życica trwała (Lolium perenne), kostrzewa czerwona (Festuca rubra) i wiechlina łąkowa (Poa pratensis). Wśród roślinności dekoracyjnej występującej w pasach drogowych, zieleńcach oraz parkach i białym ogrodzie zinwentaryzowano 11 gatunków traw ozdobnych, w tym do najpopularniejszych zaliczono kostrzewę siną, wydmuchrzycę piaskową oraz miskant chiński. Trawy ozdobne w założeniach zieleni stanowią najczęściej efektowne wypełnienie między drzewami i krzewami (kostrzewa sina (Fesatuca cinerea), hakonechloa wysmukła (Hakonechloa macra), turzyce (Carex sp.) lub z uwagi na swoją wysokość były roślinami dominującymi (wydmuchrzyca piaskowa (Leymus arenarius), manna mielec (Glyceria maxima), miskant chiński (Miscanthus sinensis). Rośliny te charakteryzowały się dekoracyjnymi liśćmi i kwiatostanami oraz przybierały koliste i półkoliste kształty. Niejednokrotnie uzupełnieniem kompozycji są elementy ozdobne, np. rzeźby, żwir, kamienie.
EN
Mowing may lead to substantial modification of the spatial structure of phytocenoses and plant populations. An important factor contributing to such modification may be the vicinity of a forest. The aim of this work is to explain how the patterns of the spatial structure of sedge meadows patches change under the influence of annual mowing and how the proximity of a forest affects these changes. The research was conducted in the years 1985-2000 in the south-west part of the Białowieża National Park (NE Poland) Study fields were located in Caricetum acutiformis community, neighbouring ash-alder floodplain forest Fraxino-Alnetum. Three experimental plots and three respective control ones (5 x 5m) were established at the forest boundary (0 m), at a distance of 50 m and 100 m from the forest. Annual mowing conducted for 15 years caused an increase in meadow plants coverage in all mown plots. The spreading of two rush species was also observed - Calamagrostis canescens in patches lying inthe distance of 100 m from the forest edge, and Phragmites australis in the ecotonal zone. The most important changes in a spatial distribution of floristic richness were noticed in mown patches located at the greatest distance from the boundary of the forest. Mowing caused strengthening of the mosaic pattern naturally occurring within patches and changed their structure from "coarsegrained" to "fine-grained" one. Permanent management of sedge meadows caused an increase in a spatial diversity in the first 10 years in all patches, irrespective of their location. After 15 years of management a simplification of the spatial structure occurred. The spatial structure of the clonal species population (Lythrum salicaria, Lysimachia vulgaris) was characterized by relative stability only in the first 5 years of mowing and only in the quadrates located far from the forest. Response of plants of unitary type of growth to management was different - annual mowing caused substantial changes in the distribution of Cirsium palustre individuals in the plots located far from the forest while individuals of Cirsium rivulare in the ecotone remained constantly in their locations. It was found that it can be caused by the presence of clump sedges which may have a greater impact on population structure of that species than mowing.
5
EN
The reported study evaluated the feasibility of rhizosphereenhanced phytoremediation in the removal of nitroglycerin (NG), as applied in commercial smokeless powder (SP), from soil. Double base smokeless powder was applied to soil mesocosms at rates of 0, 1, 5 and 10% (w/w). The mesocosms were seeded with oats (Avena sativa) or planted with live sedge plants (Carex vulpinoidea). Composted biosolids (20% w/w) were used as a soil treatment. Mesocosms were sampled at 7, 14, 30, and 60 days after initial planting. Determination of residual soil NG was performed using gas chromatography with an electron capture detector. Both plant species were capable of modest NG uptake (146.0 and 87.5mg·kg-1 for sedge and oat, respectively at the 10% SP rate). Only modest quantities of NG removal were accounted for by abiotic processes such as soil sorption. Soil bacterial numbers remained relatively constant regardless of rate of SP application. Microbial activity in the plant rhizosphere was concluded to be the major contributor to NG solubilization and decomposition. Addition of composted biosolids to soil imparted a positive effect in NG decomposition and/or removal from soil. Additional study is needed to determine long-term decomposition of smokeless powder and subsequent NG reactions in soil.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.