Author: Russia) Mezhregionalʹnai︠a︡ nauchno-prakticheskai︠a︡ konferent︠s︡ii︠a︡ "Problemy prirodopolʹzovanii︠a︡ i sokhranenii︠a︡ bioraznoobrazii︠a︡ v uslovii︠a︡kh opustynivanii︠a︡" (2000 Volgograd