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On the northern limits of woody plant species in the Lower Amur Basin, USSR Far East

A. P. Nechaev, Olavi Luukkanen and A. A. Nechaev
Annales Botanici Fennici
Vol. 16, No. 1 (1979), pp. 65-75
Stable URL: http://www.jstor.org/stable/23725208
Page Count: 11
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On the northern limits of woody plant species in the Lower Amur Basin, USSR Far East
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Abstract

The occurrence of 50 woody plant species of the temperate zone was studied at 10 fixed localities along an almost 1000-km-long section of the Lower Amur Basin from the southwest to the northeast. The northern limits of distribution of these nemoral species were found to form four distinct concentrations, which corresponded to boundaries of the bioclimatic vegetation zones suggested for East Asia by L. Hämet-Ahti and her coworkers in earlier Finnish investigations. The present work gives a detailed description of these boundary areas and a proposal for the delimitation of the northern temperate, hemiboreal, and southern boreal subzones in the Lower Amur Basin. To a great extent, the boundaries of the vegetation zones seem to coincide with mountain ranges surrounding the river basin. The present study suggests that more attention should be directed to preserving the now endangered northernmost nemoral associations. For conservation purposes two new nature parks of the zapovednik category are needed.

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