Functional structure and stability of vegetation communities in upland-ravine habitat types

The article is devoted to the estimation of functional structure and stability vegetation communities in upland- ravine habitat in the south part of Volga right bank in Saratov region. A standard distributions of plants species (geometric rows and MacArthur), corresponding to the experimental one, and their comparison with the help of normalized Shannon index were applied. Different groups of stability were established and its ecological interpretation was performed.