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Table 1 Productions of labeled-N2 species by \({}^{15}{\text{NO}}_{3}{^{ -}}\) amendment

From: A potential nitrogen sink discovered in the oxygenated Chukchi Shelf waters of the Arctic

Station Depth (m) \({}^{15}{\text{NO}}_{3}{^{ -}}\) amendment (nmol N2 L−1 h−1)
14N15N SD 15N15N SD \({F}^{\text{a}}_{{\text{NO}_3^{-}}}\) N2 production SD
R02 2.8 0.3 0.2 1.8 0.1 0.95 2.0 0.1
10.0 0.18 0.01 bdb bd 0.80 bd
22.0 10.3 4.7 8.4 2.0 0.48 36.8 8.8
30.4 27.1 2.5 11.5 0.9 0.49 47.0 3.7
47.2 31.6 1.5 18.4 2.1 0.49 75.9 8.7
CC03 3.1 bd bd bd bd 0.94 bd
9.9 0.4 0.2 2.1 0.7 0.94 2.4 0.8
19.8 9.8 3.8 27.3 10.8 0.89 34.6 13.7
30.6 4.2 0.6 8.5 0.9 0.83 12.2 1.3
48.8 bd bd bd bd 0.83 bd
CC07 4.6 1.2 0.2 13.2 0.1 0.95 14.5 0.1
10.6 bd bd bd bd 0.95 bd
20.8 0.2 0.1 3.2 1.2 0.95 3.5 1.3
33.7 0.2 0.1 4.1 1.2 0.94 4.6 1.4
R04 3.6 bd bd bd bd 0.96 bd
10.5 bd bd bd bd 0.96 bd
25.5 bd bd 1.7 0.4 0.96 1.8 0.4
29.9 bd bd 2.1 0.9 0.96 2.2 0.9
48.5 bd bd bd bd 0.96 bd
  1. aFractions of 15N-labeled \({\text{NO}}_{3}{^{ -} }\) in the incubated system; the final concentration of \({}^{15}{\text{NO}}_{3}{^{ - }}\) was 11 μmol L−1
  2. bbd here denotes below detection; only N2 accumulated within 48 h was adopted in our study (slope > 0, p < 0.05)