TABLE 1.

Site characteristics and OTUs for 29 soil samples from four geographically distinct sites

SiteSampleaDepth (m)ZoneTotal organic C concn (mg g−1)Total no. of OTUsNo. of unique OTUs
Abbott’s Pit, VirginiaAb-20.05Surface4.08695665
Ab-41.57Vadose1.835240
Ab-53.25Capillary fringe8136
Ab-104.04Saturated0.2725285
Dover Air Force Base, DelawareDH-00.07Surface4.75906891
DH-11.8Vadose0.33196172
DH-38.0bSaturated0.5817865
D1-10.05Surface4.51396355
D1-46.0cSaturated0.8422089
D1-87.5cSaturated0.5121865
DB-00.16Surface4.42920886
DB-11.8Vadose1.1717644
DB-48.0bSaturated0.5122342
DB-58.1bSaturated0.5116174
Kellogg Biological Station, MichiganW-10.04Surface12.8h599551
W-20.15Surface12.8h697685
WF-10.04Surface12.8h209192
WF-20.15Surface12.8h321312
Cannelton, MichiganH17-10.15dSurface340127119
H17-20.46dVadose300165155
H17-31.1eSaturated2509172
J19-10.15fSurface190271258
J19-20.46fVadose420272224
J19-31.1fVadose750378303
O22-10.15fSurface380166153
O22-20.46fVadose300218210
O22-31.1eVadose50310295
O22-41.4eSaturated30181179
M24-10.15gSurface38400392
  • a Most samples were 5-g samples; the only exceptions were the subsurface samples from Abbott’s Pit and Dover Air Force Base, which were 10-g samples.

  • b Sample with intermediate level of chloroethenes (>2 mg/liter).

  • c Sample with high level of chloroethenes (>3 mg/liter).

  • d Sample with high chromium level (>200,000 mg/kg).

  • e Sample with low chromium level (700 to 10,000 mg/kg)

  • f Sample with intermediate chromium level (13,000 to 32,000 mg/kg).

  • g Control sample with approximately 90 mg of chromium per kg.

  • h Average value for the site.