Vegetation dynamics on exposed pond bottoms in the Ceskobudejovicka basin (Czech Republic)статья из журнала
Аннотация: The vegetation dynamics on the exposed bottoms of fishponds and
storage ponds were studied. In 20012002, total 42 permanent
plots in 19 storage ponds and 7 plots in 2 nursery fishponds
were established. 445 relevĂSs were recorded using the
Braun-Blanquet method and stored in Czech National
Phytosociological Database in TURBO(VEG). The data from autumn
2001 and the vegetation period of 2002 were analysed using DCA
and CCA methods from the package CANOCO, STATISTICA software
and JUICE 6.1 software. Species lists exported from TURBO(VEG)
served to general description of species richness. The study
attempt to explain the relationship in vegetation cover and
floristic spectrum on one hand and abiotic factors and
management on the other hand. The CCA analysis detected as the
most important variables moisture and the week in which the
data were recorded. These factors influence the basic
vegetation structure and species composition; however, the
variables explained only 2.5 % of variability. The both factors
are partly given by the type of summer drying of the pond, i.
e. by the management. According to the type of summer drying
and optimal phase for vegetation we distinguished spring ponds
(the storage ponds and nursery fishponds) and summer ponds. The
nursery fishponds are only shortly dried in AprilJune.
Therefore there occur especially annual species with extremely
short live cycle, e. g. Coleanthus subtilis. Thermophilous
species, germinating not before June, and plants with longer
live cycle are eliminated. The spring storage ponds are dried
from December or early spring during the whole vegetation
period. They are characterised by a high amount of perennial
species, e. g. Juncus articulatus and Equisetum palustre. In
the summer storage ponds, dried mostly for 24 months in summer
and early autumn, thermophilous annual species, such as
Lindernia dubia are supported. Besides the summer drying, in
the storage ponds there are used other management practices, e.
g. herbicide spraying, mowing, liming etc. However, these
practices can exclude some species from the total species
spectrum or from the individual ponds, on the other hand, they
have positive influence for development of other species. For
example herbicides and mowing reduce total cover and
competition of some perennial species which support surviving
of annuals in the vegetation. The diversity of the storage
ponds environment is considerably higher than in the fishponds
and this is reflected in the species richness. In 17 relevĂSs
from fishponds total 24 plant species were found, in 17
comparable relevĂSs from storage ponds there were recorded 64
species.
Год издания: 2005
Авторы: Kateřina umberová, Viera Horáková, Zdeňka Lososová
Издательство: Gebrüder Borntraeger Verlagsbuchhandlung
Источник: Phytocoenologia
Ключевые слова: Botany and Plant Ecology Studies, Bryophyte Studies and Records
Открытый доступ: closed
Том: 35
Выпуск: 2-3
Страницы: 421–448