Soil microbial functional diversity between rhizosphere and non- rhizosphere of typical plants in the hilly area of southern Nixia Soil microbial biomass C, N, P and basal respiration in rhizosphere soil of typical plants on the Loess Plateau Concentrations of different carbon and nitrogen fractions in rhizosphere and non-rhizosphere soils of typical plant species in mountainous area of southern Ningxia, Northwest China.