Table S1.

Summary statistics for phylotype richness and the relative abundances of major phyla (mean ≥ 2%) from the three microbial groups

Statistic	Mean	SD	Min	Max
Fungal richness	105	14	78	134
Archaeal richness	17	5	7	26
Bacterial richness	3,533	442	2,560	4,410
Relative abundances
Fungal phyla
Ascomycota	0.558	0.122	0.306	0.809
Basidiomycota	0.134	0.054	0.037	0.262
Glomeromycota	0.034	0.024	0.002	0.072
Zygomycota	0.169	0.124	0.010	0.465
Unclassified fungi	0.097	0.044	0.039	0.245
Archaeal phyla
Crenarchaeota	0.922	0.066	0.769	0.994
Euryarchaeota	0.043	0.047	0.002	0.181
[Parvarchaeota]	0.033	0.035	0.000	0.121
Bacterial phyla
Acidobacteria	0.203	0.059	0.130	0.379
Actinobacteria	0.112	0.044	0.058	0.227
Bacteroidetes	0.105	0.041	0.031	0.202
Chloroflexi	0.036	0.021	0.016	0.106
Firmicutes	0.033	0.019	0.003	0.070
Planctomycetes	0.043	0.012	0.023	0.074
Proteobacteria	0.205	0.041	0.114	0.274
Verrucomicrobia	0.182	0.092	0.036	0.433

Values were calculated from all samples, including those from nutrient-treated plots. Bacterial, archaeal, and fungal samples were rarefied to 18,000; 100; and 485 sequences, respectively.