Arable area 1 Bacteria 1 Biospherics 1 Co-occurrence network 1 Co-occurrence networks 1 Community assembly 1 Large-scales 1 Medicinal plants 1 Microbiota 1 Null model 1 Panax notoginseng 1 Plants (botany) 1 Putative functions 1 Rare biosphere 1 Rare taxa 1 Rhizobiales 1 Rhizosphere effect 1 Rhizosphere effects 1 Soils 1 Topology 1 assembly rule 1 bacterium 1 biosphere 1 coexistence 1 dispersal 1 medicinal plant 1 natural selection 1 rhizobacterium 1 rhizosphere 1