Temat: floristic change - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effect of ecological factors on the zonation of wetland vegetation
Autorzy:: Hrivnak, R
Tematy:: vegetation zonation
wetland
wetland vegetation
vegetation change
floristic change
hydrology
zonation
species-environment relationship; Pokaż więcej
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/58846.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Changes in the structure and floristic composition of the limestone grasslands after cutting trees and shrubs and mowing
Autorzy:: Baba, W
Tematy:: cutting tree
restoration
structure
floristic composition
limestone grassland
biodiversity
change
tree
nature conservation
secondary succession
species mobility
shrub; Pokaż więcej
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/57458.pdf Link otwiera się w nowym oknie
Opis:: The calcareous grasslands belong to the species-rich plant communities in Poland. Most of them are of anthropogenic origin and they need specific management (i.e. periodical cutting suckers of trees and shrubs, grazing or mowing) in order to protect their floristic diversity. Many of calcareous grasslands have been overgrown by shrubs as a result of cessation of traditional management. The aim of this study was to compare the structure and dynamics of xerothermic hazel shrub patches, which were undergoing secondary succession with patches where different management practices aiming at restoration of species-rich limestone grassland were applied. The managed plots had a significantly higher species richness than the control one. However, they strongly differed in their floristic composition from well-preserved limestone grasslands. There were also significant differences observed between both the managed plots. Too intensive management, particularly frequent mowing of herbs resulted in expansion of grass species such as Brachypodium pinnatum and Calamagrostis arundinacea and caused a sharp decline in species richness. The species composition and turnover rate strongly depended on succesional stage (soil layer thickness) of plots at the start of the experiment. The deeper was the soil, the higher was the rate of species turnover and the smaller was the share of xerothermic and thermophilous species. The last mentioned group was dominated by species with a persistent seed bank in the soil, frequently colonizing anthropogenic habitats.
Dostawca treści:: Biblioteka Nauki

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