Country

Country

Plot

The plots in the sites

Exploratory country

Treatment

Control (kept at 80% of the carrying capacity during the experiment) or DRW (2 drying and rewetting cycles; dried to wilting point; drought duration and wilting point varied by country)

Experiment information

Repetition

3 repetitions per treatment and per control for each plot

Experiment information

Field_ID

Plot-treatment-repetition (eg. FIN07-c-1)

Experiment information

Group

The vials were divided by country and by drying speed (group 1 à 8)

Experiment information

Chamber

The Chamber where the samples spent the experiment (the vials from treatment 2 were moved from Chamber 6 to Chamber 0 due to a problem with Chamber 6, see tab 'Comments' for more details)

Experiment information

Drought_duration

Drought duration by country

days

Experiment information

DOC

Quantity of dissolved organic carbon by kg of soil

mg C * kg-1 [dry soil]

Soil information

TDN

Quantity of total dissolved nitrogen by kg of soil

mg N * kg-1 [dry soil]

Soil information

Basal_respiration

The flux in µg de C in the form of CO2 by hour by gram of soil (µg [C-CO2] * h^-1* g^-1 [dry soil]) without the addition of glucose; these results are from the dataframe 'Flux_Brute' Flux 4 (Rewetting 2)

µg [C-CO2] * h^-1* g^-1 [dry soil]

Gas flux

SIR

The flux in µg de C in the form of CO2 by hour by gram of soil (µg [C-CO2] * h^-1* g^-1 [dry soil]) with the addition of glucose

µg [C-CO2] * h^-1* g^-1 [dry soil]

Gas flux

Biomass

Microbial biomass unit calculated here following Anderson and Domsch 1978: SIR rate (µl C–CO2 g−1 dry soil h−1) × 40.04 + 0.37

mg [microbial C] g^-1 [dry soil]

Gas flux

qCO2

The metabolic quotient (respiration-to-biomass ratio) or qCO2 (respiration rate ratio : microbial biomass unit calculated here by the basal respiration / Biomass) and gives and idea of the microbial efficiency

μg [C-CO2] mg [microbial C]^-1 h^-1

Gas flux

Cumulative_CO2

Gillespie et al 2020 Comm Bio: we multiplied the CO2 and N2O flux rates, estimates of gas flux at a single point in time, by the duration of the experimental period preceding that mea- surement (Supplementary Fig. 3; the post-drought measurement by the drought period duration, and the post-rewetting measurement by the rewetting duration). The beginning flux measurement was multiplied by the buffer period (Supple- mentary Fig. 3, m0). Since we did not measure gas fluxes directly after the drying periods (when the soils dried from 80% WHC down to the drought intensity threshold before the start of the drought period), we averaged the gas flux mea- surement before the drying period and the measurement at the end of the drought period and then multiplied it by the drying period duration. We then summed these period cumulative flux estimates yielding an estimate of the total CO2 and N2O fluxes during the entire experiment.

µg [C-CO2] * g^-1 [dry soil]

Gas flux

Cumulative_N2O

Gillespie et al 2020 Comm Bio: we multiplied the CO2 and N2O flux rates, estimates of gas flux at a single point in time, by the duration of the experimental period preceding that mea- surement (Supplementary Fig. 3; the post-drought measurement by the drought period duration, and the post-rewetting measurement by the rewetting duration). The beginning flux measurement was multiplied by the buffer period (Supple- mentary Fig. 3, m0). Since we did not measure gas fluxes directly after the drying periods (when the soils dried from 80% WHC down to the drought intensity threshold before the start of the drought period), we averaged the gas flux mea- surement before the drying period and the measurement at the end of the drought period and then multiplied it by the drying period duration. We then summed these period cumulative flux estimates yielding an estimate of the total CO2 and N2O fluxes during the entire experiment.

µg [N-N2O] * g^-1 [dry soil]

Gas flux