FLORISTIC COMPOSITION AND PHYTOSOCIOLOGY OF LOW LAND ECOSYSTEMS OF VARANASIP.N. DongreAbstract Knowledge of component species is a pre-requisite in order to study plant communities flourishing in different types of ecosystems. In the present study phytosociological analysis of low land plant communities of Varanasi was carried out at two low land sites namely Site 1 representing crop ecosystem and Site II representing waste land ecosystem. Soils of the two sites differed from each other in physico-chemical properties. In all 32 species were recorded from both the study sites. Total number of species occurring at the two sites was 21 and 25, respectively. Out of these 14 species were common to both sites. Number of species restricted exclusively to Site 1 and II was 7 and 10, respectively. The number of species decreased from rainy to winter season. Ammonia baccifera L. occupied greater areas of the study sites in comparison to other species. The species exhibited more than 80 per cent frequency at both the sites. It also exhibited greater value of IVI in comparison to other species reflecting its high competitive ability. Presence of aggressive root system and very dense patches of flat leaves causing suppression of growth of nearby vegetation may be accounted as possible reasons for the dominance of Ammonia baccifera in low lands of Varanasi.
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