The River as a Factor of Plant Distribution

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Abstract
The vegetation in river valleys of the eastern part of the Eurasian continent which are annually flooded to a depth of some 8 m. displays a great and constant difference between the inundated and non-inundated portions. There are many spp. growing only in the parts of the valleys inundated in spring or, on the other hand, only in the non-inundated parts; thus we have 2 primary zones or belts quite distinct in their vegetation and not entirely coinciding with river terraces or with soil belts. There are parallel spp. replacing one another in the several belts and zones just as there are in the several plant associations[long dash]"ecological series" of spp. In different latitudes and climates plants may change their habitats, and thus compensate for their lack of physiological adaptability, which is not so great as is generally supposed. In the same locality spp. and communities of more northern or more southern type exist side by side, ranging from desert vegetation to that of the northern swamps or tundra, each with its characteristic spp., microclimate, soil conditions and even landscape.

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