TY CONF TI STABILITY MODELING PASTURE ECOSYSTEMS KW mathematical modeling KW pasture ecosystems KW stability of solutions KW differential equations KW Gershgorin circles JO CONTEMPORARY CHALLENGES AND TOPICAL ISSUES OF BIODIVERSITY AND SUSTAINABILITY OF PLANT COMMUNITIES AU Salugin, A.N. AU Melikhova, E.V. AU Korneeva, E.A. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov