期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2007
卷号：18
期号：4
页码：234-239
DOI：10.1684/sec.2007.0107
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Mohamed Tarhouni , Farah Ben Salem , Azaiez Ouled Belgacem , Belgacem Henchi , Mohamed Neffati Institut des régions arides (Ira), Laboratoire d’écologie pastorale, 4119 Médenine, Tunisie, Faculté des sciences, Campus universitaire, 2092 Tunis Tunisie Key words: animal pressure, arid zone, floristic composition, grazing, rangelands, Tunisian steppe, watering point DOI : 10.1684/sec.2007.0107 Page(s) : 234-9 Published in: 2007 Neighbourhoods of wells can provide the best context for studying the effects of animal pressure on floristic cortege. We used seasonal monitoring of flora richness for three years in our study. Jaccard’s index was calculated in the more humid seasons (spring 2004 and 2006). This study was carried out along transects radiating around three wells located in the communal rangelands of El Ouara, pre-Saharan Tunisia. The main results show: i) seasonal drought affects floristic richness more than animal activity; ii) the annual/perennial ratio is more strongly influenced by seasonal drought; and iii) Jaccard’s index shows that the disturbance of the arid Tunisian steppes can enhance their floristic homogenization.
关键词：animal pressure; arid zone; floristic composition; grazing; rangelands; Tunisian steppe; watering point
