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63. Roztocký Háj - Tiché údolí (Roztoky Grove - Quiet Valley) Nature Reserve (RP) |
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The valley of the Únětický potok brook and adjacent slopes and plateaux
in the respective cadastres. Cadasters: Roztoky nr. Prague (district Prague-West),
Suchdol and Prague 6. Area: 114.2343 ha. Elevation: 195 - 300 m above sea
level. Established by the Ordinance of the Ministry of Education No. IX-357-2-51
of August 10, 1951, the Ordinance of the Ministry of Education No. 100.988/51
of September 9, 1951, and the Ordinance of the Ministry of Culture of the
Czech Republic No. 14 200/88 of November 29, 1988.
Protection of the general character of the landscape, indigenous flora,
minor fauna and geological formations.
The bedrock consists of Proterozoic rocks with the prevalence of greywackes,
siltstones and shales and a powerful strip of lydites (silicites in the
west. There are also veins of porphyric and basalt rocks. Loamy and stony
screes, deluvium, loess with rankers and brown earths on top, relics of
tropic weathering. Dispersed boulders below lyditeridges.
Large woods with alternating cow-wheat oak and hornbeam, woodrush oak,
heather oak and hornbeam and maple woods. The formerly mown valley meadows
change spontaneously into alder woods. The northern bare slopes used to
be covered with large heaths which receded after forestation. Similarly
the acidophilous rocky steppes and sandy areas on southern slopes are becoming
overgrown with shrubs - hawthorn, dog rose, blackthorn and in succession
sequence with ash and oak trees. The number of important species includes
Corydalis pumila in oak and hornbeam wood, Alyssum montanum on the prophyrite
vein, Biscutella varia on the diabase vein, and Corynephorus canescens
and Helichrysum arenarium on sandy terraces.
The wood is partly natural and continuous (testified to by the presence
of Acalles comutatus), partly artificial, including alien wood species
(false acacia, red oak, and others). This is reflected also in invertebrate
fauna: typical and significant species can be found in natural parts of
the forest only. The number of ground beetles includes e.g. Amara nitida,
Poecilus virens, Pterostichus burmeisteri and Abax ovalis, the number of
phytophagous leaf beetles e.g. Clytra quadripunctata, Cryptocephalus marginatus,
Phylotreta ochripes and Aphtona cyanella, the snout beetles the terricolous
Brachysomus echinatus, Trachodes hispidus. The oaks host Polydrusus marginatus
and Curculio pellitus, the hazel Curculio nucum, the elm Magdalis armigera,
the scots pine Polydrusus impar and others. Plectophloeus erichsoni erichsoni
from the Pselaphidae family was found here. The butterfly species include
e.g. the swallow-tail (Papilio machaon) and the scarce swallowtail (Iphiclides
podalirius), the small tortoiseshell (Aglais urticae) and the garden tiger
(Arctia caja). The gastropods are represented by Perforatella bidentata.
Numerous vertebrate specis, especially birds. Nesting site of the green
and the grey woodpeckers and the wryneck. There are about 50 species of
passerines including the icterine warbler, the serin, the bullfinch, the
goldfinch and the yellow-hammer. Some 20 mammal species. However, the suslik
and the hamster have disappeared.
The better part of the area (over 100 ha) is covered with mixed woods
at present with the prevalence of oaks (42.5%), pines (21.4%), hornbeams
(10.9%) and birches (7.7%). The admixture of the red oak propagates intensively
by shoots. Inadequate wood species planted after the Second World War devastated
completely some valuable areas, such as the area covered with Filipendula
ulmaria below the Kozí hřbety ridge.
The forest was influenced anthropically as early as in the prehistorc
time. There is a Hallstatt mound burial ground on the plateau. The slopes
were used as pastures and subjected to secondary forestation only at the
beginning of the 20th century. The area is threatened by heavy tourist
traffic (from the nearby city). Forest management conforms with the approved
forest management plan. Accidental tree felling, hunting, grazing. There
is an educational track through the reserve.
Kubíková (1985), Kubíková, Molíková (1980).
Hollow willow trees along the Únětický potok brook.
Hedgehogs belong to frequent inhabitants of Prague area.
A "Quiet Valley" can be found even in Prague.
The woods in the nature reserve of Roztoky Grove - Quiet Valley consist mostly of leaf trees.
The Únětický Potok Brook has carved its bed mostly in Proterozoic rocks.
The Roztoky Grove - Quiet Valley (PR).
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