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Table 2 Sediment physicochemical variables of Jinshui River and Qi River

From: N2O emission and its influencing factors in subtropical streams, China

Sampling season River Sampling area s-NO3− (mg kg−1) s-NH4(mg kg−1) SOC (g kg− 1) SOC/NO3
High flow season Jinshui River Downstream 6.04 ± 2.12a 5.74 ± 1.95 7.42 ± 1.87b 1.30 ± 0.39
Midstream 5.97 ± 4.47b 4.83 ± 0.98 3.14 ± 0.48c 2.09 ± 1.66
Upstream 6.70 ± 2.34a 5.99 ± 1.39 10.06 ± 0.80a 1.80 ± 0.49
Qi River Downstream 6.79 ± 0.42ab 6.17 ± 1.24b 5.55 ± 2.39 1.35 ± 0.39
Midstream 7.98 ± 0.74a 8.61 ± 1.05a 7.93 ± 6.14 0.65 ± 0.68
Upstream 5.33 ± 1.74b 5.52 ± 0.55b 4.38 ± 0.72 1.03 ± 0.49
Normal flow season Jinshui River Downstream 1.34 ± 0.09 0.80 ± 0.47 3.47 ± 2.05 2.62 ± 1.61
Midstream 0.82 ± 0.25 0.89 ± 0.55 5.74 ± 4.53 4.85 ± 4.71
Upstream 1.22 ± 0.07 0.60 ± 0.10 9.48 ± 3.88 5.09 ± 2.83
Qi River Downstream 0.98 ± 0.22 1.19 ± 0.46 2.58 ± 3.43 7.01 ± 3.11
Midstream 0.83 ± 0.32 1.13 ± 1.02 1.79 ± 1.13 5.32 ± 2.34
Upstream 1.06 ± 0.73 1.26 ± 0.79 5.50 ± 3.53 7.50 ± 6.14
Low flow season Jinshui River Downstream 0.60 ± 0.16 3.43 ± 0.97 2.64 ± 1.11 4.59 ± 2.29
Midstream 1.00 ± 0.07 2.19 ± 1.14 5.21 ± 3.46 3.32 ± 3.25
Upstream 1.03 ± 0.37 2.44 ± 1.92 2.72 ± 0.40 5.36 ± 0.75
Qi River Downstream 1.81 ± 1.43 2.89 ± 0.67 2.87 ± 1.75 5.16 ± 1.21a
Midstream 0.94 ± 0.25 2.10 ± 0.72 1.47 ± 0.64 5.06 ± 0.27a
Upstream 0.58 ± 0.32 1.73 ± 0.59 3.26 ± 1.00 2.74 ± 4.39b
  1. Values are presented as mean ± SD (n = 3); different letters indicate significant differences among sampling areas by linear mixed modeling (P < 0.05). Abbreviations: the NO3 and NH4+ concentration of sediment are denoted by s-NO3 and s-NH4+. Sediment organic carbon concentration is denoted by SOC. The ratio of sediment organic carbon to NO3 in sediment is denoted by SOC/NO3