Vegetation analysis and allelopathy of strilis oat (Avena sterilis L.) under natural rangeland and cultivated lands

Avena sp. is a major weed threat cereal cropping and there is a need to the ecological knowledge to provide principles for facilitates their management tactics. The autoecology of strilis oat (Avena sterilis L.) into four localities natural rangelands and cultivated lands at El-Jabal Al-Akhdar, Libya were investigated. The demography studies in the cultivated sites revealed 274 specimens belonging to 15 species, within 15 genera and 6 families (wheat) and 252 specimens for 21 species that belonging to 17 genera and 6 families (barley) respectively. The description analysis in rangelands were reported approximately 185 specimens belonging to 14 species within 14 genera and 5 families (Wadi El-Mashel) and 185 specimens that belonging to 17 species within 16 genera and 5 families (Wedi El-Mienisry). The variation between the cultivated and rangelands sites have higher species richness, species evenness, diversity indexes, and homogeneity with smooth rank abundance plots. However, barley and Wedi El-Mienisry communities were more diverse than wheat and Wadi El Mashel. The correlation analysis between main filed density (MFD) of A. sterilis and diversity was strong negative. The phytotoxicity of A. sterilis water extracts was higher in wheat than barley under experiment conditions, while subterranean parts pose significant allelopathic effects than other parts that affect plant assemblages, communities and explained the lower yield of wheat and barley crops.