Vertical distribution characteristics and source apportionment of nitrogen in the Longyangxia Reservoir in the upper reaches of the Yellow River.

The Chl-a content exhibited an increasing trend within the water depth range of 0–20 m, reaching a maximum concentration of 2.31 μg/L at a depth of approximately 10 m.

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The δ 15 N-NO 3 - value of the middle water body (20–40 m) exhibited a decreasing trend with increasing depth, while the δ 15 N-NO 3 - value of the bottom water body (40–100 m) showed an increasing trend with depth ( Fig 7a ).

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