Fig. 4

Time series of hydro-climatic conditions and C concentrations across the transect. a–c Time series of water table position (black line) with its annual mean and standard deviation (full and dotted red lines, respectively) and the water temperature (grey line) in a the stream water, b riparian groundwater, and c upslope groundwater. The groundwater ¹⁴C sampling occasions are identified by red circles. d–f Time series of CO₂ concentration and DOC concentration in the d stream water, e riparian groundwater, and f upslope groundwater. Time series are presented for the period from May 2015–June 2016