Seasonal CH4 flux dynamics measured with automated chambers at Trail Valley Creek during 2019 (a) and 2021 (b). Fluxes were measured between DOY 172-236 in 2019 and DOY 150-243 in 2021. Also shown is the probability density distribution of the data. Flux data show daily sums of hourly measured fluxes and are microsite means +- s.e. of transparent and opaque chambers combined (n = 6 for lichen and tussock, n = 5 for shrub). Insets show diel variation in CH4 uptake, measured hourly, from lichen and shrub for two selected 4 day periods (2-6 July 2019 and 24-28 June 2021; date labels start at 00:00 of the labelled day). Negative flux values denote net CH4 uptake. Dashed lines in the probability density plots indicate the median flux. Note that positive CH4 fluxes (emissions) are shown on a log scale.
