Table 2 Results of regression analyses to investigate the influence of soil properties and landform on τ14C, τi and DOC.

From: Temperature and moisture are minor drivers of regional-scale soil organic carbon dynamics

SOC dynamics

ANOVA structure

Significance of drivers

pH

Clay

Slope

Orientation

log τ14

Driver + BGR + MI × TI

*

n.s.

n.s.

n.s.

BGR + Driver + MI × TI

*

n.s.

n.s.

BGR + MI × TI + Driver

*

n.s.

n.s.

log τi

Driver + BGR + MIxTI

***

***

n.s.

BGR + Driver + MI × TI

***

***

n.s.

n.s.

BGR + MI × TI + Driver

***

***

n.s.

n.s.

DOC

Driver + BGR + MI × TI

*

***

*

n.s.

BGR + Driver + MI × TI

*

***

*

n.s.

BGR + MI × TI + Driver

**

***

*

n.s.

  1. Soil organic carbon (SOC) dynamics: τ14C and τi are respectively the log-transformed 14C and incubation-based turnover times (years). DOC is the cumulative dissolved organic carbon produced during the 181-day incubation relative to the total organic carbon content of the bulk mineral soil (0–20 cm depth) at the beginning of the experiment (g kg−1OC). Drivers: pH, clay (%), slope (%) and orientation (degrees). Symbols refer to p-values: ***<0.001, **<0.01, *<0.05, <0.1, ‘n.s.’ not significant. Crossed out values indicate that significance is not meaningful because it is not consistent across the three model structures tested for each indicator of SOC dynamics. For extended results, refer to Table S2.
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