Plant Unique identifier for each plant (n = 591). Microcosm Unique identifier for each microcosm (n = 24). P.treat Phosphorus treatment (n = 4 levels). Myc.treat Mycorrhizal treatment (AM = inoculated with AM fungus; NM = non-mycorrhizal control). Species Plant species (ACACEL = Acacia celastrifolia; BOSAQU = Bossieae aquifolium; EUCMAR = Eucalyptus marginata; HAKUND = Hakea undulata; PHYCAL = Phyllanthus calycinus). Position Of plant in microcosm; letters for columns and numbers for rows. Root.biomass Of plant roots in grams; excluding weight of any detatched roots. Shoot.biomass Of plant shoots in grams. Total.biomass Of plant in grams; excluding weight of any detatched roots. SR.ratio Root to shoot ratio of each plant. Myc.score Visual estimate of mycorrhizal colonisation of plant roots where 0 = no colonisation, 1 = very low colonisation, 2 = low colonisation, 3 = moderate colonisation, 4 = high colonisation, and 5 = very high colonisation. NS = not scored. Microcosm.biomass Summed weight in grams of all plants in microcosm including detatched roots. Relative.biomass Total.biomass as a percentage of Microcosm.biomass. Nodules Number of nodules for nitrogen-fixing plants. NA = not assessed. Clusters Number of cluster roots for Hakea undulata. NA = not assessed.