The impact of anthopic action and aridiy on the pastoral production in the Stipa tenacissima L.steppes of Algeria | Impact de l'action anthropique et de l'aridité sur la production des pâturages des steppes de Stipa tenacissima L. en Algérie
2005
Kadi-Hanifi, H.(Faculty of Biological Sciences, Sciences and Technology Houari Boumediène University, Algiers, (Algeria). Ecology and Environment Laboratory) | Sadji, A. | Amghar, F.
The current state of the steppe rangelands came as a result of precarious environment constraints (climatic and edaphic aridity) and of an old and increasingly intense anthropic exploitation. To assess the pastoral production of the alfa steppes, a matrix of 183 groups and 499 species collected in all the Stipa tenacissima (alfa) formations of Algeria, was subjected to factorial analyses of the correspondences combined with ascending hierarchical ranges. The latter were conducted by the following two methods; a quantative method, consisting of cutting the vegetation and assessing its energy value and a qualitative and simpler method, which gives a pastoral value to a group starting from the coefficient values assigned to each species as well as their relative frequencies. From the pastoral analysis, we observe that the pastoral value of the various alfa groups has no correlation with the rainfall. The pasture intensity inhibits the beneficial effect of the rainfall.
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Эту запись предоставил Mediterranean Agronomic Institute of Bari