Fig. 3
From: Current forest carbon fixation fuels stream CO2 emissions
Mass controls on 14C-CO2 and 14C-DOC in groundwater and stream water. Scatterplot showing the groundwater and stream water 14C-CO2 and 14C-DOC in %modern as a function of their respective concentrations in mg C L−1. The solid line represents the least square linear regression model 14C-DOC = DOC × −0.31 + 116.6, R2 = 0.45, p = 0.01, excluding the two severely depleted 14C-DOC values from the upslope deep location in August and October identified with the white cross. The grey line indicates the range in atmospheric 14C-CO2 content in the northern hemisphere during 2015–2016, according to Graven et al. 68
