نبذة مختصرة : Desertification was determined as land degradation in arid, semi-arid, and dry sub-humid areas resulting from various factors, including climatic variations and human activities, in other words, it is a reduction in land productivity. Thus, vegetation cover and its dynamic, reflecting land productivity, can be accepted as a representation of land degradation and desertification. Vegetation degradation in arid and semi-arid land has been exposed by community change including changes in species composition and reduction in projective cover, aboveground biomass, and species diversity. However, vegetation degradation varies in natural zones and land use types. In this research, we aimed to determine vegetation degradation in Bornuur soum, Tuv province based on vegetation projected cover, species composition, and diversity. As a result of vegetation surveys at a total of 13 sites throughout the territory and vegetation map, 50.1 percent of the total territory is very strong, 9.1 percent strong, 0.8 percent moderate, and 40 percent in light degradation, separately. Vegetation degradation mainly occurs in plain, small hills, mounds, and lower slopes of high mountains, their valleys, and river valleys or meadows. Community composition was profoundly changed in this area, such as community major species were invaded by digression species including Artemisia frigida, Artemisia adamsii, Carex duriuscula, Potentilla acaulis, Convolvulus ammanii, adapting and predominating at degraded land. The main factors that lead to degradation were agricultural activities, overgrazing and local travel, especially, its effects on the northwest part of the territory like steppe and mountain steppe in Nart, Arangat, Dund Us, and river valleys of Boroo, SHavart, Shivert, Sujigt. [ABSTRACT FROM AUTHOR]
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