Mesic deciduous forest sites containing inhibitor, facilitator, and other tree species (i.e. Quercus rubra).

Most sites were in the Great Smoky Mountains National Park (GSMNP), North Carolina and Tennessee. Other sites were in the Nantahala National Forest (NNF) either west of Otto, NC or around Highlands, NC. Soil samples were collected from around all the tree species except those with the abbreviation ND, no data. Asterisks denote the focal tree species selected for the plant-soil biota interactions experiment. Each of the three inhibitor and facilitator species (in bold) were selected six times from among the pool of sites.