Relative importance of abiotic variables on hourly measured CH 4 fluxes determined with an RF model for lichen, shrub and tussock measured with automated chambers at Trail Valley Creek. For relative importance of variables for data aggregated to different timescales see Extended Data Fig. 3 and for the direction of the responses see Extended Data Fig. 4. The RF analysis used data from years 2019 and 2021 (36,782 observations; Supplementary Table 8). The RF model for all vegetation types (n = 18 chambers) includes only CH 4 uptake, whereas for the individual vegetation types (n = 6 chambers), all data were included. The three most important variables are indicated by vertical dashed lines. Note that 'PAR chamber' denotes measurements in opaque and transparent chambers (PAR set to 0 mol m -2 s -1 in opaque chambers), whereas 'PAR met station' was measured at the nearby weather station. T Soil (surface) denotes surface soil temperature, measured at the soil surface below the vegetation or lichen layer.
