Caractéristiques édaphiques des groupements steppiques à Stipa tenacissima L.

الملخص EN

The upper platue of the Algerian country is considered as a part of the steppe area of the south west Oranean area.

This area falls under the influence of the semi arid climate.

The present investigation was unertaken to study the soil types and composants of in the upper platue in relation to the steppe plant groups of Stipa tenacissima L.

The edaphologic results of soil show - A high percentage elements.

- A high of calcaire total, - A structure particular who dominante on profiles whole, - The soils depth of field are brown.

In a edaphologic perspective, the different principal component analyses (ACP) demonstrated that the most important edaphic parameters for plant diversity is in relation with lithologie