Original paper

Die Einwirkung einiger Umweltfaktoren des Donaudeltas auf die Abgrenzung des Lebensraumes von Schilf-, Rohrkolben- und Seggengesellschaften

[Interaction of some environment factors in the Danube Delta on the delimitation of the vital space occupied by the reed, mace reed and sedge cenoses]

Roman, Traian; Roman, Liliana; Raduca, Constantin; Molnar, Augustin

Abstract

The paper shows that the space occupied by the three cenoses in the reed plots in the Danube Delta is determined by the local environment conditions, of which the type of soil, the pH of the horizons and the variation of the water layer depth on the land contour lines play a major part. The paper also shows that, according to these conditions: - the mace reed is strictly dependent upon the type of soil and the pH of the horizons (peat-humiferous and humiferous-oozy with a pH from acid to slightly acid), is dependent upon the water presence at least at the soil surface level, and is indifferent to the water layer depth (up to 200 cm depth) and the light and temperature variations; - the reed is strictly dependent upon the water presence on the soil, and is dependent upon the water layer depth (up to 100 cm), the pH of the horizons (neutral to moderately alkaline) and the light and temperature variations; - the sedge is strictly dependent upon the water layer depth (up to 70 cm), is dependent upon the water presence at least at the rhizome level and is indifferent to the type of soil, the pH of the horizons and the temperature variations.

Keywords

environment factorsreedsedgemace reedsoilDanube Delta