Table 3 Random Forest analyses % variances explained and MRM P-values for each SOC decomposition parameter based on the community profile from that depth

From: Tundra microbial community taxa and traits predict decomposition parameters of stable, old soil organic carbon

 Random Forest % Variance explained/ MRM P-values
Fast SOCSlow SOCPassive SOCOther
ProfileDepthf1k1CR1fCR1R1fR1f2k2CR2fCR2R2fR2f3k3CR3fCR3R3fR3Crtotplot
Bacterial/ archaeal (16S)015cm17%/0.8711%/0.00213%/0.8321%/0.52414%/0.96514%/0.71826%/0.8746%/0.17711%/0.434%/0.1932%/0.81237%/0.84825%/0.7054%/0.16469%/0.57838%/0.7269%/0.81633%/0.81556%/0.42114%/n.d.
1525cm28%/0.90615%/0.58%/0.8986%/0.9678%/0.3750%/0.09643%/0.5366%/0.228%/0.0770%/0.58611%/0.40921%/0.4748%/0.3224%/0.77360%/0.34618%/0.4214%/0.05827%/0.57467%/0.0514%/n.d.
3558cm37%/0.54510%/0.60615%/0.5348%/0.1736%/0.03810%/0.51259%/0.824%/0.11555%/0.2157%/0.8959%/0.0388%/0.91758%/0.8732%/0.21258%/0.04221%/0.4183%/0.41918%/0.46262%/0.00214%/n.d.
Fungal (ITS)015cm18%/0.94417%/0.56821%/0.79939%/0.91216%/0.15315%/0.32318%/0.3373%/0.59132%/0.48923%/0.85830%/0.00647%/0.47920%/0.37417%/0.15357%/0.00540%/0.70915%/0.02445%/0.0761%/0.82251%/n.d.
1525cm31%/0.8667%/0.61724%/0.93621%/0.6110%/0.6099%/0.32624%/0.4810%/0.48343%/0.75410%/0.4483%/0.6533%/0.6053%/0.5715%/0.80950%/0.22929%/0.84825%/0.11535%/0.65762%/0.41935%/n.d.
3558cm42%/0.4111%/0.1743%/0.11331%/0.011%/0.8910%/0.12225%/0.4017%/0.17138%/0.0965%/0.02913%/0.20310%/0.08329%/0.5040%/0.96650%/0.7627%/0.3366%/0.11523%/0.60253%/0.30844%/n.d.
Functional (GeoChip)015cm6%/0.89426%/0.39311%/0.71944%/0.5666%/0.77514%/0.59335%/0.18212%/0.79938%/0.15319%/0.92326%/0.19254%/0.27236%/0.12530%/0.47670%/0.75551%/0.1177%/0.95759%/0.83969%/0.06624%/n.d.
1525cm36%/0.7232%/0.75826%/0.65834%/0.0186%/0.25810%/0.02937%/0.0378%/0.73329%/0.0347%/0.29619%/0.07143%/0.99239%/0.05717%/0.00470%/132%/0.9935%/0.7943%/0.41172%/0.18624%/n.d.
3558cm51%/0.1568%/0.9325%/0.81647%/0.065%/0.6889%/0.22150%/0.94614%/0.21757%/0.23610%/0.23140%/0.00425%/0.06752%/0.92341%/0.05564%/0.15635%/0.17528%/0.65736%/0.04369%/0.04423%/n.d.
  1. MRM P-values are from on Bray-Curtis dissimilarities of community profiles related to Euclidian distances of SOC decomposition parameters. Those in bold text have ≥30% variance explained by 16S, ITS, or GeoChip profiles (Random Forest) or P ≤ 0.05 (MRM). Estimated parameters included cumulative CO2 respiration from the fast (CR1), slow (CR2), and passive (CR2), SOC pools and total (CRtot), with the unit of g CO2-C g−1 SOC; percentages of the cumulative CO2 respiration from the decomposition of the fast (fCR1), slow (fCR2), and passive (fCR3) SOC pools; CO2 respiration rates from the decomposition of the fast (R1), slow (R2), and passive (R3) SOC pools with the unit of g CO2-C g−1 SOC day−1; percentages of the respiration rate from the decomposition of the fast (fR1), slow (fR2), and passive (fR3) SOC pools; relative pool sizes of the fast (f1), slow (f2), and passive (f3) SOC pools; and decomposition rate constants of the fast (k1), slow (k2), passive (k3) SOC pools