To elucidate the spatial distribution of AM fungi and ecological function of soil factors,we sampled the rhizosphere soil of Ammopiptanthus mongolicus from Alashan and Wulate of Inner Mongolia,China and three pairs of AM fungi primer were used.The study showed that:(1)AM1/NS31 primer could amplify AM fungi more efficiently,and the number of DGGE bands was high.(2)The species composition of AM fungal communities was highly similar in two sites,but the species richness and dominance were different between soi...