Nitrogen removal in freshwater sediments of riparian zone: N-loss pathways and environmental controls.

Along the vertical direction of the riparian zone, conductivity (EC) and total dissolved solids (TDS) showed a decreasing trend, Fe(II) gradually increased, and oxidation reduction potential (ORP) gradually decreased, and the reducibility of the sedimentary environment in the riparian zone gradually increased.

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We also observed that under different carbon-nitrogen ratios (DOC: NO 3 − ), the content of NO 3 − -N in the reaction system showed a downward trend ( Figure 6C ), while the content of NH 4 + -N showed a trend of rapid increase and then gradual decrease ( Figure 6D ), and at the same time, the higher the value of DOC: NO 3 − , the more dramatic the changes in the NO 3 − -N and NH 4 + -N content ( Figures 6C , D ).

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With the increase of sediment depth in the riparian zone, TN showed a downward trend, DON showed an increasing trend ( Figure 2A ), and dissolved organic nitrogen (DIN) content gradually decreased ( Figure 2A ), which confirmed that the riparian zone had a removal effect on inorganic nitrogen pollution.

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