Table 1.
Summary statistics for partial Mantel tests of correlation between functional genes and environmental factors
| Gene category | pH | Conductivity (μs/cm) | TP (g/kg) | TN (g/kg) | TC (g/kg) | C/N |
|---|---|---|---|---|---|---|
| Nitrogen-cycling pathway | ||||||
| Anammox | − 0.124 (0.792) | − 0.311 (0.954) | 0.104 (0.263) | − 0.035 (0.578) | − 0.320 (0.956) | 0.110 (0.313) |
| Assimilatory nitrate reduction | 0.254 (0.055) | 0.347 (0.017) | − 0.220 (0.919) | − 0.438 (0.990) | 0.050 (0.412) | 0.512 (0.006) |
| Denitrification | 0.184 (0.094) | 0.380 (0.014) | 0.009 (0.428) | − 0.027 (0.560) | 0.299 (0.019) | 0.425 (0.008) |
| Dissimilatory nitrate reduction | 0.421 (0.020) | 0.446 (0.007) | − 0.198 (0.932) | − 0.086 (0.723) | 0.322 (0.016) | 0.372 (0.019) |
| Nitrification | 0.040 (0.384) | 0.206 (0.109) | 0.266 (0.100) | − 0.076 (0.642) | 0.284 (0.077) | 0.085 (0.274) |
| Nitrogen fixation | 0.453 (0.007) | 0.476 (0.003) | − 0.270 (0.968) | 0.207 (0.151) | 0.321 (0.024) | 0.049 (0.304) |
| Organic degradation and synthesis | − 0.081 (0.681) | 0.093 (0.294) | 0.127 (0.248) | − 0.256 (0.915) | − 0.004 (0.505) | 0.331 (0.049) |
| Sulfur-cycling pathway | ||||||
| Assimilatory sulfate reduction | 0.122 (0.222) | 0.331 (0.028) | − 0.208 (0.922) | − 0.361 (0.987) | 0.007 (0.511) | 0.603 (0.005) |
| Dissimilatory sulfate reduction and oxidation | 0.180 (0.120) | 0.257 (0.069) | − 0.191 (0.838) | − 0.273 (0.961) | − 0.050 (0.603) | 0.346 (0.013) |
| Link between inorganic and organic sulfur transformation | − 0.142 (0.812) | 0.066 (0.389) | − 0.056 (0.536) | − 0.285 (0.906) | − 0.104 (0.703) | 0.426 (0.050) |
| Organic sulfur transformation | 0.026 (0.475) | 0.147 (0.238) | − 0.212 (0.878) | − 0.301 (0.946) | − 0.091 (0.703) | 0.463 (0.021) |
| SOX systems | − 0.090 (0.717) | 0.059 (0.413) | 0.038 (0.364) | − 0.349 (0.968) | − 0.012 (0.535) | 0.456 (0.016) |
| Sulfur disproportionation | − 0.016 (0.559) | 0.069 (0.342) | 0.088 (0.268) | − 0.074 (0.676) | 0.064 (0.331) | − 0.061 (0.594) |
| Sulfur oxidation | 0.132 (0.167) | 0.286 (0.024) | − 0.110 (0.751) | − − 0.060 (0.650) | 0.097 (0.306) | 0.379 (0.026) |
| Sulfur reduction | 0.077 (0.354) | 0.137 (0.227) | 0.122 (0.209) | -0.226 (0.849) | 0.128 (0.292) | 0.222 (0.139) |
| Methanogenesis | ||||||
| Core methanogenesis | − 0.295 (0.977) | − 0.084 (0.692) | 0.164 (0.214) | − 0.221 (0.871) | − 0.122 (0.71) | 0.313 (0.101) |
Values are correlation coefficients with p values in brackets (p < 0.05 in bold)
TP: Total phosphorus; TC: Total carbon; TN: Total nitrogen; C/N: Total carbon/Total nitrogen