Estimated number of observed OTUs (at 97% similarity), richness, diversity, and coverage (n = 3, mean±SE)^* of soil for each site.

n = number of replicates of each site *Different lowercase letters indicate statistically significant differences (P<0.05) between soil sites according to Duncan's test at P<0.05. OTUs, operational taxonomic units; Coverage, Good's nonparametric coverage estimator; ACE, abundance-based coverage estimator; Shannon, nonparametric Shannon diversity index; Simpson, nonparametric Simpson diversity index. Sites are designated by recovery time (years) or as undisturbed reference (UND). Estimated number of observed OTUs (at 97% similarity), richness, diversity, and coverage (n = 3, mean±SE)* of soil for each site.