Figure 3
From: The chemical succession in anoxic lake waters as source of molecular diversity of organic matter
Susceptibility of DOM-C (DOC) pools to biological and photochemical processing for each lake. (a) DOC photolability as determined from DOC mineralization during 24 h of light exposure in a photoreactor. Considering diel light cycles and the natural light intensity in northern regions, this would roughly correspond to 6 days of natural light exposure. Values from assays are summarized as boxplots per lake (boxes indicate interquartile range, line shows the median, black points indicate samples away from the interquartile range by more than 1.5-fold). (b) DOC biolability measured in bioassays that retain the ambient redox condition [epilimnion: oxic (left), hypolimnion: anoxic (right)]. Colored points show samples from oxic waters after lake mixis introduced hypolimnetic DOC to the epilimnion. (c) Biolabile DOC in anoxic bioassays (y-axis) related to the DOC of anoxic samples from the hypolimnion (x-axis). The line indicates a broad average of labile DOC in samples from aquatic environments (models in45 Fig. 1a and Fig. S1).
