Table 1 Effects of decadal in situ deep-thaw and depth on soil abiotic variables, respiration rates, and bacterial community structure (BCS); association between environmental variables and BCS
From: Long-term in situ permafrost thaw effects on bacterial communities and potential aerobic respiration
Soil chemistry and respiration (ANOVA) | Decadal deep thaw (treatment) | Depth | Treatment:depth | |||
|---|---|---|---|---|---|---|
F | p | F | p | F | p | |
Square-root organic matter content (OMC) | 2.839 | 0.123 | 24.972 | <10 −4 | 0.320 | 0.730 |
pH | 1.365 | 0.270 | 4.847 | 0.019 | 6.797 | 0.006 |
Log ammonium | 0.074 | 0.792 | 0.936 | 0.409 | 3.260 | 0.060 |
Moisture (gravimetric) | 2.012 | 0.187 | 7.795 | 0.003 | 1.126 | 0.344 |
Log bulk respiration (per g dry weight) | 5.254 | 0.045 | 19.764 | <10 −4 | 0.658 | 0.529 |
Log intrinsic respiration (per g OM) | 0.232 | 0.641 | 0.417 | 0.665 | 3.920 | 0.037 |
Q10 (11–21 °C) | 3.360 | 0.097 | 5.770 | 0.011 | 4.101 | 0.032 |
Bacterial community structure (BCS) | Dev | p | Dev | p | Dev | p |
ManyGLM | 1579 | 0.006 | 3711 | 0.001 | 1101 | 0.001 |
Association with BCS (envfit) | PCo1 | PCo2 | R 2 | p | ||
Organic matter content (OMC) | −0.990 | −0.144 | 0.231 | 0.014 | ||
pH | 0.819 | 0.573 | 0.111 | 0.147 | ||
Ammonium | −0.113 | 0.994 | 0.317 | 0.004 | ||
Moisture (gravimetric) | −1.000 | 0.005 | 0.234 | 0.015 | ||
Root density | −0.804 | −0.595 | 0.233 | 0.022 | ||
