The physical and chemical characters of soil,the density and coverage and age-class structure of T.mongolica population in different habitats were analyzed.Besides,the change in antioxidant system of T.mongolica in different growth stages and habitats were studied.Results are showed as follows:(1)There is a significant difference in density,coverage and age-class structure of T.mongolica population in different habitats.The habitats of low mountain,upland and hill are beneficial to seedling renewal,and the ...