Appendix A. Detailed description of the study sites and of the experimental set up.

Detailed description of the study sites and of the experimental set up

Appendix B. Results of soil analyses conducted on soil samples from both origins before and after sterilization.

Results of soil analyses conducted on soil samples from both origins before and after sterilization

Appendix A. Individual plant shoot and root biomass responses to soil feedback and herbivory.

Individual plant shoot and root biomass responses to soil feedback and herbivory

Biomass data of early and mid successioinal plant species in monoculture and mixture as influenced by plant-soil feedback

Data were collected in the greenhouse two-stage (conditioining & feedback) biodiversity experiment in Wageningen, the Netherlands. Abbreviated headlines are as follows: "stage"=succession stage;"species"=plant species (including ten early succesional plant species and ten mid successional plant species);"soil"including conditioned soil and unconditioned soil;"monoculture"=biomass production in monoculture(g pot-1);"mixture1""=biomass production in plant community assemblage1(g pot-1);"mixture2""=biomass production in plant community assemblage2(g pot-1);"mixture3""=biomass production in plant community assemblage3(g pot-1);"mixture4""=biomass production in plant community assemblage4(g pot-1);"mixture5""=biomass production in plant community assemblage5(g pot-1)

Rare bacteria affect plant performance data

Rare bacteria affect plant performance dat

Plant species used in experiments.

1<p>Nomenclature according to Van der Meijden <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0031596#pone.0031596-VanderMeijden1" target="_blank">[80]</a>.</p>2<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0031596#pone.0031596-Tamis2" target="_blank">[69]</a>.</p>3<p>Native to the Netherlands.</p>4<p>recently <i>Senecio jacobaea</i> has been renamed as <i>Jacobaea vulgaris</i><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0031596#pone.0031596-Pelser1" target="_blank">[81]</a>.</p

Mean cumulative soil respiration.

<p>(± SE). Measured in flasks with litter from exotic (filled circles) and native plant species (open circles) for <i>Artemisia</i> (a), <i>Rorippa</i> (b), and <i>Senecio</i> (c).</p

Repeated-measure ANOVA for soil respiration.

<p>Litter from exotic versus native plant species (named Origin) of three genera (<i>Artemisia, Rorippa</i> and <i>Senecio</i>) were compared.</p

Linear model testing effect of inoculation and farm on shoot biomass of <i>Triticum aestivum</i> in the conditioning phase.

<p>Linear model testing effect of inoculation and farm on shoot biomass of <i>Triticum aestivum</i> in the conditioning phase.</p

Effect of proportion of donor soil added on total plant community biomass.

<p>Soil was mixed in a proportion of 1∶1 or 1∶5 donor∶receptor soil. Significance between proportions within donor soil origin: ns = non significant, (*) <i>P</i> = 0.05, ** <i>P</i><0.01, *** <i>P</i><0.001.</p