Fig. 1: Characterization of the Hainich CZE groundwater transect, nitrification activity, and distribution of nitrifying prokaryotes.
From: Differential contribution of nitrifying prokaryotes to groundwater nitrification
A Schematic cross-section of the Hainich groundwater monitoring transect showing two superimposed aquifer assemblages accessible by 10 wells with various depths. B Overview of the concentrations of dissolved oxygen, ammonium, and nitrate from oxic (blue) and hypoxic/ anoxic (green) groundwater wells (n = 24 per well). Single dots represent one measurement, the crossbar indicates the mean of all values, and the error bars show the variation from the mean. Outliers are beyond the error bars. Lowercase letter code indicates significant differences based on Dunn’s multiple comparison test (p < 0.05). C Nitrification rates assessed by 15N based labeling of groundwater from five days incubation close to in situ conditions (n ≥ 3 per well; n.d. = not detected; n.a. = not available). D Gene abundances of amoA per L and E fractions of amoA genes in groundwater from different groups of ammonia-oxidizing prokaryotes in 10 groundwater wells (n ≥ 3).
