Abstract
Spatial-temporal structure and coenotic diversity of dry steppes of Eastern Mongolia was identified by analyzing characteristics of naturally occurring vegetation connection to the regional landscape structure. Different types of combinations of plant communities (phytocoenochores) were determined in the vegetation structure of the Eastern Steppe Station Tumén-Tsogt (in Sukhebator district). Temporal dynamics of steppe ecosystems was defined from the studies of steppe cover fluctuations in 2008. The coenotic role of eight annual plant species that form synusiae in the steppe communities was shown through analysis of species constancy, projective cover, and activity. Knowledge about the trend of successions and the manifestation of fluctuations in vegetation cover is necessary for the development of science-based system of management options to maintain the number and abundance of different plant groups in plant communities. Monitoring the state of natural ecosystems has a major scientific and practical importance, since steppe ecosystems are the basic component of the pasture’s resources of the country.
Highlights
Spatial-temporal structure and coenotic diversity of dry steppes of Eastern Mongolia was identified by analyzing characteristics of naturally occurring vegetation connection to the regional landscape structure
In 2008, in practically all communities of the dry-steppe of the Eastern Mongolian steppe biome, significant changes in their organization have been studied. These changes were manifested by strong development of synusiae of annual species and changes in the composition of dominants, structure, products, and physiognomy of the steppe communities
Such stages of steppe ecosystem development represent cyclical changes and relate to the fluctuations caused by changes in climatic parameters in the current and previous years
Summary
Spatial-temporal structure and coenotic diversity of dry steppes of Eastern Mongolia was identified by analyzing characteristics of naturally occurring vegetation connection to the regional landscape structure. The natural invariants of steppe ecosystems have certain average characteristics that determine their primary structure and relative stability to the impact factors Indigenous communities and their varying components represent a single dynamic system. In 2008, in practically all communities of the dry-steppe of the Eastern Mongolian steppe biome, significant changes in their organization have been studied These changes were manifested by strong development of synusiae of annual species and changes in the composition of dominants, structure, products, and physiognomy of the steppe communities. Such stages of steppe ecosystem development represent cyclical changes and relate to the fluctuations caused by changes in climatic parameters (volume and regime of rainfall) in the current and previous years. Climatic conditions of 2008 established as a result of this precipitation promoted the development of annual species that prevailed in herb cover in many types of steppes at the Station
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