Table 2.
Summary of studies, including the percentage of studies in which microbial community composition was sensitive to the disturbance, and the average length of studies that found resistant versus sensitive composition
| Disturbance | No. of studies | Percentage of studies sensitive | Average length of study, years ± SD |
P value | |
|---|---|---|---|---|---|
| Resistant | Sensitive | ||||
| CO2 increase | 20 | 60 | 3.3 ± 1.9 | 3.6 ± 1.9 | 0.78 |
| N/P/K fertilization | 38 | 84 | 4.8 ± 4.5 | 8.2 ± 8.7 | 0.17 |
| Temperature | 11 | 82 | 1.1 ± 1.3 | 3.0 ± 5.0 | 0.35 |
| C amendments | 41 | 83 | 0.15 ± 0.09 | 4.9 ± 12.6 | 0.03 |
The P value reported is the result of a t test (assuming unequal variances) between the study times for the resistant versus sensitive studies.