[Economic typology and evaluation of grassland vegetation condition]
Meerovskij, A.S. | Tribis, V.P.(Belarus Research Inst. for Land Reclamation and Grassland, Minsk (Belarus))
A vatiant of complex estimate and economic typology of perennial grass vegetation is developed. It differs by objectivity, evidence and logical concordance based on the following four basic parameters: species frequency, group composition, heterogeneity of plant species composition of meadows vegetation and disturbance of grass stand. Species frequency in meadow herbage is estimated on a number of representative registration plots (1/2m2) and then is classified on the basis of "gold section" gradation (Fibonacci numbers). Typological constructions are made on the basis of group composition of vegetation estimated by atomic weight or coverage by appropriate groups and displayed with the help of trinar coordinate system. Modified Sorensen index is used for estimation of vegetation species heterogeneity centers within a field. A special scale has been developed for quantitative estimation of the disturbance degree of grossland cover of a field for eye definition of free from plants area (trampling of vegetation cover by hoofs of agricultural animals, technical damage of grassy cover, erosion spots accompanied by vegetation cover damage, absence of vegetation owing to unfaourable growing conditions)
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