Fig. 2: Linear regression between change in discharge and Leaf Area Index (LAI).
From: Arctic riparian shrub expansion indicates a shift from streams gaining water to those that lose flow
The change in downstream discharge where losing and gaining discharge is shown as negative and positive values, respectively, was normalized to stream length (% change in discharge per 1 km). The mean LAI related linearly to the change in discharge, where gaining-stream sections show lower riparian LAI values than losing-stream sections. Included are the linear fit (P < 0.01, R2 0.81) and the 95% confidence band (red shading) for seven (black dots) of the eight stream sections. The downstream-measurement location of the eighth stream section (gray square), here seen as an outlier, was within 100 m (upstream) of an aufeis field on Oksrukuyik Creek and was therefore likely to be disproportionately influenced by recent rain events as a temporary upwelling zone (referred to as “outlier” and also OLD, Supplementary Figs. 3 and 5).
