Variables of a) abiotic soil properties, b) soil biota abundance/biomass/concentration and c) soil biota diversity, measurement unit, data range and method.

Soils are classified according to [44], for further details see material and methods or supporting information S1.
Classification of groups for follow-up models after obtaining a significant overall model for the relationship between abiotic soil properties and soil biota abundance:
1bacteri.
2total biomass of saprotrophic fungi.
3arbuscular mycorrhizal fungi.
4yeasts.
5soil fauna or diversity.
6yeasts.
7extracellular proteins.
8soil fauna.
Abbreviations: Acidobact. = Acidobacteria, bact. = bacteria, tot. = total.