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ECO-PEDOLOGICAL CONDITIONS OF THE CNIDIUM DUBIUM (SCHKUHR) THELL. SPECIES IN A BIOTOPE FROM BRAŞOV DEPRESSION

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Author(s): N. Bacaintan | M. Danciu | G. Zagreanu | Antonela Petreanu | A. Indreica

Journal: Soil Forming Factors and Processes from the Temperate Zone
ISSN 1582-4616

Volume: 7;
Issue: 1;
Start page: 63;
Date: 2008;
Original page

Keywords: Cnidium dubium | Cnidio-Deschampsietum | pelosol | gleyed soil

ABSTRACT
Cnidium dubium (Schkuhr) Thell. is an endangered, relict plant. In Romania, its presence is rare. That is why, probably, its ecological, chorological and cenological features are not very well-known. While we were carrying out a soil survey in the Ozun village (Covasna county), we tried to enrich our understanding of the ecology of the Cnidium dubium and we analysed a biotope where this species is very well represented (Cnidio-Deschampsietum association, Passarge 1960). The biotope is situated in the central area of Braşov Depression (2150 m south from the edge of the Ozun village, 350 m east from the Râul Negru), at the altitude of 508 m. The characteristic soil (soil profile 12, Ozun) is pelosol brunic-cambic-aluvicstagnic (SRTS 2003), equivalent with Endostagnic Fluvic Cambisol (Eutric, Clayic) (WRB 2007). In The Romanian System of Soil Taxonomy (SRTS 2003) the pelosol is a newly introduced soil type. It assembles texture species which belonged to other soil types (in previous classifications), i.e. the species rich in clay, dominant unswelling, at least within the first 100 cm. The eco-pedological conditions of the Cnidium dubium species from the Ozun village site can be synthesized as follows: horizontal surface (alluvial plain, non inundating by overflow), with pelosol affected by powerful surface (temporary) water logging and moderate phreatic water logging, with moderate seasonal variation of moisture content (without a very long stagnation of water in spring and without pronounced dryness in summer and the beginning of autumn), with high trophicity (extremely high reserve of humus within the first 50 cm, moderate base saturation within the first 30 cm), in a temperate continental climate, chilly – humid, with a hidroclimatic balance mildly exceeding.
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