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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 2.

SOM chemistry of control and warming plots at 10–20 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.

10–20 cm soil depth Bulk
 fPOM
 oPOM
 MaOM
Control Warming Control Warming Control Warming Control Warming
% of bulk soil weight 2.35 ± 0.36 2.47 ± 0.16 22.6 ± 6.94 9.00 ± 2.20 69.1 ± 7.77 83.1 ± 3.15
Organic C content (% dry weight) 4.96 ± 0.75 4.74 ± 0.67 32.7 ± 0.58 30.0 ± 0.44 14.9 ± 0.44 15.6 ± 1.31 3.61 ± 0.58 3.65 ± 0.53
Total N content (% dry weight) 0.38 ± 0.05 0.34 ± 0.05 1.08 ± 0.04 0.96 ± 0.05 −** 0.98 ± 0.11 0.87 ± 0.05 0.33 ± 0.05 0.30 ± 0.05
C:N ratio 13.0 ± 0.28 13.7 ± 0.12 30.5 ± 0.71 31.5 ± 1.14 15.7 ± 1.31 18.0 ± 0.76 10.9 ± 0.59 12.1 ± 0.11
δ13C −25.8 ± 0.07 −26.1 ± 0.05 −26.8 ± 0.21 −27.0 ± 0.31 −26.2 ± 0.17 −26.7 ± 0.14 −25.6 ± 0.12 −26.0 ± 0.07 −*
Δ14C −11.1 ± 7.9 13.5 ± 6.6 57.3 ± 0.77 61.1 ± 7.1 23.4 ± 11.6 49.3 ± 3.3 −48.7 ± 12.6 −14.0 ± 8.6
δ15N 2.3 ± 0.26 2.03 ± 0.25 −0.6 ± 0.20 −0.73 ± 0.33 1.04 ± 0.39 0.12 ± 0.18 2.81 ± 0.17 2.19 ± 0.28
Carbohydrates 20.9 ± 0.77 19.0 ± 1.04 25.1 ± 0.58 26.3 ± 0.22 37.4 ± 0.40 25.6 ± 1.34 −** 24.8 ± 0.75 25.4 ± 0.75
Lipids and waxes 20.5 ± 0.46 22.8 ± 2.25 16.1 ± 0.51 17.0 ± 1.03 15.5 ± 0.76 16.2 ± 0.97 16.1 ± 0.18 15.7 ± 0.40
N-bearing compounds 33.5 ± 1.33 31.4 ± 1.34 22.0 ± 0.42 21.1 ± 0.50 24.1 ± 1.56 27.3 ± 0.33 37.3 ± 0.28 34.6 ± 0.59 −*
Aromatic compounds 8.75 ± 0.35 9.26 ± 0.73 7.03 ± 0.32 6.48 ± 0.14 6.27 ± 0.11 7.01 ± 0.23 7.84 ± 0.25 8.20 ± 0.43
Lignin 3.79 ± 0.29 4.46 ± 0.92 12.5 ± 0.47 12.9 ± 0.37 3.27 ± 0.52 6.93 ± 0.59 +* 2.78 ± 0.23 3.21 ± 0.25
Phenolic compounds 12.5 ± 0.92 13.1 ± 0.73 17.3 ± 0.17 16.4 ± 0.63 13.4 ± 1.24 16.9 ± 0.46 11.2 ± 0.92 12.9 ± 0.30