Table 4 Contributions of different factors to the variation in the community structure of AOA and AOB as revealed by canonical correspondence analysis or redundancy analyses
Variables | AOA | AOB | ||
|---|---|---|---|---|
Variance explained (%) | P value | Variance explained (%) | P value | |
Climate | ||||
 MAT (°C) | 5.53 | 0.01 | 2.00 | 0.30 |
 MAP (mm) | 7.68 | 0.00 | 1.00 | 0.36 |
Catchment land use | ||||
 Agriculture (%) | 2.00 | 0.50 | 22.00 | 0.00 |
 Built-up land (%) | 4.76 | 0.02 | 2.00 | 0.23 |
 Vegetation (%) | 3.68 | 0.15 | 0.00 | 0.63 |
 Water bodies (%) | 0.00 | 0.55 | 3.00 | 0.09 |
Water quality | ||||
 pH | 3.38 | 0.13 | 1.00 | 0.54 |
 Depth (m) | 3.38 | 0.13 | 2.00 | 0.11 |
 DO (mg L‒1) | 3.53 | 0.13 | 3.00 | 0.11 |
 TOC (mg L‒1) | 2.15 | 0.51 | 1.00 | 0.36 |
 NH4 + (mg L‒1) | 7.06 | 0.00 | 1.00 | 0.31 |
 NO3 − (mg L‒1) | 4.14 | 0.06 | 3.00 | 0.06 |
 TP (mg L‒1) | 3.22 | 0.24 | 12.00 | 0.01 |
 Chl-a (mg m−3) | 3.07 | 0.20 | 22.00 | 0.00 |
Sediment properties | ||||
 Moisture (%) | 3.07 | 0.16 | 2.00 | 0.37 |
 Density (g cm−3) | 1.84 | 0.55 | 1.00 | 0.19 |
 STC (mg g−1) | 2.92 | 0.24 | 1.00 | 0.38 |
 STN (mg g−1) | 2.30 | 0.38 | 2.00 | 0.15 |
 C/N | 7.06 | 0.00 | 0.00 | 0.58 |
Vegetation characteristics | ||||
 Richness | 2.46 | 0.40 | 1.00 | 0.44 |
 Biomass (g m‒2) | 1.23 | 0.78 | 1.00 | 0.35 |
 PTN (mg g−1) | 3.99 | 0.04 | 1.00 | 0.41 |
 PTP (mg g−1) | 2.76 | 0.24 | 0.00 | 0.63 |
All variables | 81.21 | Â | 84.30 | Â |