Table 2 The assignment of functional groups at different chemical-shift regions and their proportions in the total spectral area determined by 13C NMR.

From: Effects of changes in straw chemical properties and alkaline soils on bacterial communities engaged in straw decomposition at different temperatures

Group

190–220 ppm

165–190 ppm

142–165 ppm

110–142 ppm

93–110 ppm

60–93 ppm

45–60 ppm

0–45 ppm

Assignment

ketones/aldehydes

COO/N–C = O

aromatic C–O

aromatic C–C + /H

alkyl O–C–O

O–alkyl

NCH/OCH3

alkyl

L30

1.4 ± 0.2cd

6.2 ± 0.1d

3.9 ± 0.1d

9.4 ± 0.1c

9.8 ± 0.2a

42.8 ± 1.0a

8.4 ± 0.1d

18.2 ± 1.2a

M30

1.0 ± 0.1d

6.7 ± 0.1d

3.9 ± 0.0d

9.7 ± 0.1c

8.5 ± 0.1b

38.1 ± 0.1b

10.9 ± 0.1b

21.2 ± 0.1ab

H30

2.0 ± 0.4bc

8.7 ± 0.3c

5.5 ± 0.3c

11.9 ± 0.3b

7.9 ± 0.1b

30.7 ± 0.2c

11.9 ± 0.3a

21.5 ± 1.1ab

L120

2.9 ± 0.0ab

9.9 ± 0.1b

5.8 ± 0.1bc

11.7 ± 0.1b

7.3 ± 0.1c

31.1 ± 0.1c

9.8 ± 0.1c

21.5 ± 0.2a

M120

3.0 ± 0.1a

9.9 ± 0.1b

6.2 ± 0.0b

12.5 ± 0.1ab

7.0 ± 0.0d

30.2 ± 0.1c

9.9 ± 0.1c

21.2 ± 0.1ab

H120

3.0 ± 0.1ab

10.8 ± 0.2a

7.4 ± 0.1a

12.9 ± 0.2a

6.5 ± 0.0cd

24.8 ± 0.2d

11.7 ± 0.2a

23.0 ± 0.4a

  1. L30: low temperature (15 °C) on day 30 (early stage of decomposition); M30: moderate temperature (25 °C) on day 30; H30: high temperature (35 °C) on day 30; L120: low temperature on day 120 (late stage of decomposition); M120: moderate temperature on day 120; H120: high temperature on day 120.
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