Alpine Steppe Vegetation Patterns in the Koyondu Valley, Kyrgyz Republic

Abstract

As a part of an ecological research project on wild animals, alpine steppe vegetation in the Koyondu Valley, the Sarychat-Ertash State Reserve, in the northern Tian Shan Mountains of the Kyrgyz Republic was surveyed. Horses and sheep were kept as livestock, while wildlife such as Marco Polo sheep (argali) and wolves also inhabited the region. Information regarding wildlife, weather conditions and the livelihood of human inhabitants within the region was scarce and difficult to obtain. In May 2011, 21 releve plots from 5 types of vegetational physiognomy were established at elevations ranging from ca. 3,400 to 3,600 m. In each plot, coverage, sociability and height of each plant species were measured. As a result, vegetation physiognomy of type IV plots (grassland with accumulated detritus) proved to have by far the greatest coverage and v-values of all physiognomy types. Seven varieties of plant community (A1 to A4 and B1 to B3) were recognized based on differing combinations of 4 differential plant species. Varieties of plant community did not exactly correspond to types of vegetation physiognomy, and type IV plots displayed the most variability. Distribution patterns of each community in relation to elevation and slope direction appeared similar on both the left (facing southwest) and right (facing northeast) banks of the valley, but exceptions were observed more frequently on the left bank than the right. When v-value was plotted against the total number of plant species present, the majority of plots fell within a successive transition. Type IV plots, however, were out of this transition and possessed exceptionally abundant vegetation.