Table 5.
Statistically significant relationships (based on RDA analysis) between bulk and rhizosphere soil [whole community and pMENs bacterial community structure modules (marked with capital letters)], and air physical, bulk soil physic-chemical and short root morphological parameters.
| Community/Module | Air and soil parameters | Variation explained % | Root morphology parameters | Variation explained % |
|---|---|---|---|---|
| BULK SOIL | ||||
| Whole | (RH+AT)*** | 29.3 | Dia*** | 15.6 |
| A | (RH+pH)*** | 32.9 | Dia** | 16.5 |
| B | (RH+SWP)** | 39.6 | Dia** | 25.3 |
| C | (RH+AT+SOM)*** | 37.0 | Dia* | 13.0 |
| D | (pH+AT)* | 22.7 | TipW* | 11.8 |
| E | RTFL* | 15.9 | ||
| F | totN* | 11.0 | SRA* | 12.5 |
| G | (RH+SWP+pH)*** | 50.9 | Dia*** | 24.0 |
| H | RH*** | 29.0 | Dia*** | 26.5 |
| I | (RH+AT)*** | 29.3 | TipW* | 13.5 |
| RHIZOSPHERE SOIL | ||||
| Whole | (RH+AT+SOM)*** | 40.6 | Dia*** | 20.7 |
| J | AT*** | 52.1 | Dia*** | 45.0 |
| K | (SWP+ST)*** | 43.6 | TipW** | 20.2 |
| L | RH*** | 28.2 | (Dia+RTFL)*** | 35.7 |
| M | (pH+ST+AT)*** | 56.5 | ||
| N | AT* | 21.8 | ||
| O | (AT+SWP)*** | 32.4 | (Dia+TipL)*** | 31.3 |
| P | (AT+RH)*** | 36.7 | Dia** | 22.7 |
| Q | RH*** | 31.6 | Dia* | 12.3 |
| R | (RTD+RTFL)** | 24.2 | ||
The means of the study years vegetation periods air relative humidity (RH), atmospheric temperature (AT), soil water potential (SWP), and soil temperature (ST) were used in the analyses. SOM, soil organic matter; totN, total nitrogen content; Dia, short root diameter; TipW, short root tip weight; TipL, root tip length; RTFL, root tip frequency per unit of length; SRA, short root area; RTD, root tissue density.
*
p < 0.05;
**
p < 0.01;
***
p < 0.001.