Abstract
The middle part of one of the largest rivers of Eurasia, the Lena, stretches for a more than 1500 km; the width of its floodplain varies from 5 to 30 km. This floodplain is covered by islands at various stages of development, which are covered by a mosaic of different successional stages. Forests are the terminal stage of succession. Soils are permafrost, ranging from chernozem to saline and alluvial types. Grassland communities are due mainly to the activity of man. Two major ecological factors are responsible for the differentiation: hydrothermic regime (regulated mainly by the altitude above the river) and by soil salinity. Both direct and indirect gradient analyses are used to demonstrate this relation. Species positions along these gradients are given. Two climatically differentiated parts of the floodplain are distinguished. The first steppe-meadow floodplain is characterized by low soil salinity and a more favourable regime of precipitation; the second (meadow-steppe part) by a very dry and continental climate and strong soil salinization up to true sodum-chloride solontchaks.
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Mirkin, B.M., Kononov, K.E., Gogoleva, P.A. et al. The floodplain grasslands of the Middle Lena-river. I. General characteristic and ordination. Folia geobot. phytotax. 27, 225–245 (1992). https://doi.org/10.1007/BF02853016
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DOI: https://doi.org/10.1007/BF02853016