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. Author manuscript; available in PMC: 2016 Dec 29.
Published in final edited form as: Soil Biol Biochem. 2016 Dec;103:300–307. doi: 10.1016/j.soilbio.2016.09.003

Table 1.

SOM chemistry of control and warming plots at 0–10 cm soil depth (n = 3). Values for carbohydrates, lipids and waxes, N-bearing compounds, aromatic compounds, lignin and phenolic compounds are derived from Py-GC/MS and are given in relative peak area. Bold numbers and asterisks indicate a statistically significant difference between control and warming treatments (* P-value < 0.05, ** P-value < 0.01). The plus and minus signs show whether warming caused an increase or a decrease in the respective parameter.

0–10 cm soil depth Bulk
 fPOM
 oPOM
 MaOM
Control Warming Control Warming Control Warming Control Warming
% of bulk soil weight 5.70 ± 1.34 5.15 ± 1.20 18.0 ± 5.18 18.1 ± 3.88 69.1 ± 5.79 71.3 ± 5.59
Organic C content (% dry weight) 8.68 ± 1.62 6.43 ± 0.69 28.4 ± 0.64 30.5 ± 0.50 17.3 ± 0.77 16.5 ± 0.17 4.82 ± 0.79 4.29 ± 0.57
Total N content (% dry weight) 0.59 ± 0.11 0.44 ± 0.05 1.01 ± 0.04 1.09 ± 0.05 1.07 ± 0.02 0.97 ± 0.03 –* 0.40 ± 0.06 0.36 ± 0.05
C:N ratio 14.6 ± 0.15 14.7 ± 0.30 28.1 ± 0.61 28.0 ± 0.78 16.1 ± 1.01 17.1 ± 0.56 11.9 ± 0.34 11.9 ± 0.07
δ13C −25.9 ± 0.02 −26.2 ± 0.06 −26.8 ± 0.11 −26.7 ± 0.16 −26.4 ± 0.14 −26.7 ± 0.10 −25.8 ± 0.08 −26.0 ± 0.06 −*
Δ14C 49.8 ± 9.4 57.6 ± 4.7 94.8 ± 7.8 80.1 ± 2.7 69.3 ± 9.0 78.5 ± 6.6 11.4 ± 12.5 31.0 ± 2.9
δ15N 4.98 ± 1.68 1.27 ± 0.22 −1.43 ± 0.05 −1.28 ± 0.45 0.17 ± 0.44 −0.38 ± 0.14 1.54 ± 0.23 2.08 ± 0.21
Carbohydrates 24.3 ± 0.37 21.6 ± 1.45 28.0 ± 0.87 30.5 ± 3.26 25.4 ± 0.66 24.5 ± 1.42 29.0 ± 0.95 24.8 ± 2.1
Lipids and waxes 17.1 ± 0.94 21.7 ± 2.62 16.0 ± 0.64 15.8 ± 0.71 15.8 ± 0.24 16.2 ± 0.34 16.1 ± 0.10 16.6 ± 0.61
N-bearing compounds 27.4 ± 0.69 28.9 ± 0.27 21.7 ± 0.24 20.4 ± 0.90 28.6 ± 1.28 27.2 ± 0.32 29.6 ± 1.48 35.1 ± 1.61
aromatic compounds 9.55 ± 0.46 11.0 ± 1.11 6.22 ± 0.02 5.69 ± 0.32 6.85 ± 0.05 6.95 ± 0.36 8.96 ± 1.90 6.99 ± 0.21
Lignin 7.40 ± 0.61 4.75 ± 0.74 11.1 ± 0.35 13.0 ± 0.46 7.07 ± 0.05 8.07 ± 0.86 3.51 ± 0.42 2.73 ± 0.26
Phenolic compounds 14.3 ± 0.19 12.0 ± 0.93 17.1 ± 0.43 14.6 ± 1.48 16.3 ± 0.86 17.0 ± 0.39 12.8 ± 0.32 13.8 ± 0.23