To reveal the relationship between molecular variation,gene flow and the habitats,RAPD markers were used to study the molecular ecology of Caragana spp.populations in Maowusu sandy grassland.Estimated by Shannon phenotypic diversity index from RAPD data,it was found that 82 4% of molecular variation existed within the populations while 17 6% of which among populations.The genetic different coefficient and genetic distance between populations of C.korshinskii and of C.intermedia ...