Flooding patterns and variations in the composition and successional trends of riparian vegetation in the upper and lower Red Deer River in southern Alberta, Canada. were studied in order to establish which flood regimes were most important in the regeneration and maintenance of riparian vegetation communities. with a particular focus on riparian poplars. The dominant riparian tree in the upper river is Populus balsamfleru with some Picea gluuca and in the lower river Populics deltoides (the plains cottonwood). Dendrochronological studies of the poplars along the river show that major periods of regeneration correspond with major flood events during the record period. Extensive cottonwood regeneration occurred in the period 19W20. corresponding with a series of floods. some as high as the I in 100-year event. In addition, just
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