Table 13 Data dictionary for ecosystem fluxes (dataset x).

Variable name	Description	Variable type	Variable range or levels	Units	How measured
date_time	Date and time of observation		2023-12-05T08:45:15Z - 2023-12-16T21:00:27Z	yyyy-mm-dd hh:mm:ss	defined
unique_location_id	Concatenated site_id, elevation, aspect, and plot_id	character	2000_east_1 - 2800_west_5		defined
day_night	Measurement performed at daytime or nighttime	categorical	day - night		defined
flux_type	Flux measured or calculated, including cue, evap_day,evap_night, evapotrans, gpp, nee, npp, resp_day, resp_night, soil_evap, soil_resp, transpiration, wue	character	cue - wue		defined
clean_flux_type	Full name and units of the flux	character	Carbon Use Efficiency (GPP/NPP) - Water Use Efficiency (Transpiration/NPP)		defined
flux_value	Flux readings	numeric	−17.879–28.546	µmolm⁻² s⁻¹ (carbon fluxes) or mmolm⁻² s⁻¹ (water fluxes)	recorded
flux_category	Carbon or water fluxes	categorical	Carbon - Water		defined
r_squared	Model fit	numeric	0–0.999		recorded
device	What equipment was used to measure the microclimate value	character	calculated - LI-8100		defined
flag	Quality flag	character	manual_flux_time_selection - okay		defined

Ecosystem CO₂ and H₂O fluxes at different aspects on an elevation gradient in Witsieshoek, South Africa. Variable names, description, variable type, range or levels, units and short description are given for all variables. Note that variables that are shared across datasets are reported in Table 2. Abbreviations used in the flux_type column: cue (carbon-use efficiency), evap_day and evap_night (evaporation at day and night respectively), evapotrans (evapotranspiration), gpp (gross primary productivity), nee (net ecosystem exchange), npp (net primary productivity), resp_day and resp_night (ecosystem respiration and day and night respectively), soil_evap (soil evaporation), soil_resp (soil respiration), transpiration (ecosystem transpiration), wue (water-use efficiency).

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