Floristic characteristics of habitats in the Upper Dlinnaya River (Northern Koryakia, North-Eastern Asia)

摘要

The north-eastern part of the Koryak Highland belongs to the tall "stlanik" ("elfin wood" of creeping trees or tall shrubs, mostly of Pinus pumila and Alnus fruticosa) subzone which corresponds to the subalpine belt of the North-Eastern Asian high-elevation areas, but as to the zonal position is a part of Asian Beringia in Russia. The distribution of vascular plants by habitats and their geographical and ecological characteristics are given. A total of 21 types of habitats were revealed in the upper reaches of the Dlinnaya River. Moderately moist and moderately dry types of habitats predominate, whereas moist and wet ones occur infrequently. The analysis of plant distribution by landscape elements has shown that the most of hypoarctic, arctic boreal and boreal species are concentrated in river valleys and lower parts of the subalpine belt, where more than half of all the species of the area are represented. The greatest number of boreal elements are present in the Dlinnaya River valley, and hypoarctic species prevail in the subalpine belt. Arctic-alpine species are distributed more evenly within the landscape, but prevail in the alpine belt. A brief review of vegetation of the area belonging to the Siberian-Far-Eastern stlanik subzone is given.