Table 2.
Variations of the relative abundance of genes related to microbial biogeochemical cycling over different weathering times (mean relative abundance >1%).
| Gene function category | Relative abundance % (mean abundance) | HmV and normality | Slope | SE | R 2 | p-param | Adj R2 | p-perm | p-sign |
|---|---|---|---|---|---|---|---|---|---|
| S Cycle | 0.49% (30566) | Null | −2.58E-04 | 1.47E-04 | 0.16 | 0.099 | Null | Null | Null |
| N Cycle | 0.95% (59035) | No, HtV | 8.73E-04 | 3.31E-04 | 0.30 | 0.018* | 0.26 | 0.035 | 0.035* |
| C Cycle | 2.34% (146672) | No, HtV | 1.38E-03 | 3.85E-04 | 0.44 | 0.003** | 0.41 | 0.012 | 0.012* |
| C Fixation | 76.09% (111643) | Null | 1.11E+00 | 5.51E-01 | 0.20 | 0.060 | Null | Null | Null |
| C Degradation | 12.70% (18588) | No, HtV | −1.51E+00 | 4.83E-01 | 0.38 | 0.007** | 0.34 | 0.007 | 0.007** |
| Methane Metabolism | 11.21% (16440) | Null | 3.97E-01 | 3.43E-01 | 0.08 | 0.265 | Null | Null | Null |
| ANRA | 6.65% (3911) | Null | −1.44E-02 | 2.20E-02 | 0.13 | 0.523 | Null | Null | Null |
| DNRA | 4.36% (2592) | Null | 1.29E-02 | 1.20E-02 | 0.12 | 0.302 | Null | Null | Null |
| N Fixation | 0.21% (122) | Null | 1.96E-04 | 4.79E-03 | 0.06 | 0.968 | Null | Null | Null |
| N Transport | 5.10% (2990) | Null | 1.75E-02 | 2.93E-02 | 0.17 | 0.560 | Null | Null | Null |
| Denitrification | 1.39% (804) | Yes | −3.27E-02 | 1.36E-02 | 0.55 | 0.002* | 0.49 | 0.002 | 0.002** |
| Nitrification | 0.65% (368) | Yes | −2.14E-02 | 8.12E-03 | 0.60 | <0.001*** | 0.55 | <0.001 | <0.001*** |
| ONM | 82.14% (48528) | Null | 2.15E-02 | 3.89E-02 | 0.03 | 0.588 | Null | Null | Null |
| ASR | 93.87% (28648) | Yes | 2.16E-02 | 8.26E-03 | 0.30 | 0.019* | 0.26 | 0.019 | 0.019* |
| DSR | 6.67% (2019) | Null | 7.26E-04 | 4.52E-03 | 0.00 | 0.874 | Null | Null | Null |
| SOX | 5.47% (1713) | Yes | −2.16E-02 | 7.60E-03 | 0.34 | 0.012* | 0.29 | 0.012 | 0.012* |
| Hemicellulose | 27.50% (5140) | Null | 2.19E-01 | 7.66E-01 | 0.01 | 0.779 | Null | Null | Null |
| Starch | 41.47% (7620) | Yes | 2.99E+00 | 1.24E+00 | 0.27 | 0.028* | 0.22 | 0.028 | 0.028* |
| Aromatics | 1.00% (181) | Yes | 2.74E-01 | 1.08E-01 | 0.29 | 0.021* | 0.24 | 0.021 | 0.021* |
| Chintin | 8.04% (1532) | Null | −1.07E+00 | 7.26E-01 | 0.12 | 0.159 | Null | Null | Null |
| Lignin | 0.03% (6) | Null | −2.60E-02 | 1.35E-02 | 0.19 | 0.072 | Null | Null | Null |
| Cellulose | 21.97% (4109) | Yes | −2.38E+00 | 1.01E+00 | 0.26 | 0.031* | 0.21 | 0.031 | 0.031* |
| 3HP/4HB | 23.86% (26699) | Yes | −1.12E-02 | 3.96E-03 | 0.34 | 0.012* | 0.29 | 0.012 | 0.012* |
| 3HP | 25.78% (28819) | Yes | −1.34E-02 | 3.73E-03 | 0.45 | 0.002** | 0.41 | 0.002 | 0.002** |
| DC/4HB | 36.16% (40311) | No, HtV | 2.05E-02 | 7.41E-03 | 0.32 | 0.014* | 0.28 | 0.029 | 0.029* |
| rTCA | 45.55% (50766) | No, HtV | 1.88E-02 | 7.46E-03 | 0.28 | 0.023* | 0.24 | 0.046 | 0.046* |
| rAcCoA | 10.89% (12227) | Yes | 3.27E-02 | 1.06E-02 | 0.39 | 0.008** | 0.31 | 0.008 | 0.008** |
| Calvin cycle | 27.87% (31093) | Null | −3.55E-01 | 2.60E-01 | 0.10 | 0.191 | Null | Null | Null |
The relative abundances of gene function category were averaged for each site (n = 18). The variance explained (R2), regression slope, and parametric p-value (p-param) of the linear regression, normality test, homogeneity test for variance, and permutation test p value (p-perm) with different weathering times were shown in the table (* indicates p < 0.05, ** indicates p < 0.01, and ***indicates p < 0.001). HmV, homogeneity of variance; HtV, heterogeneity of variance; p-sign, significance value of p.