Table 2 Summary of belowground soil measurements from soil cores collected in 2014

From: Large emissions of CO2 and CH4 due to active-layer warming in Arctic tundra

Treatment

Date

Depth (cm)

%C

%N

MBC (mg/g)

Warming

8-Sep

0−10

12.1 ± 8.39

0.689 ± 0.556

–

  

10–20

8.68 ± 6.05

0.499 ± 0.390

0.940 ± 1.05

  

20–30

9.22 ± 8.07

0.527 ± 0.524

–

 

20-Sep

0–10

–

–

–

  

10–20

7.82 ± 4.98

0.415 ± 0.294

0.999 ± 1.19

  

20–30

5.66 ± 2.65

0.312 ± 0.175

–

Control

8-Sep

0–10

16.5 ± 10.8

0.658 ± 0.161

–

  

10–20

10.4 ± 4.57

0.564 ± 0.291

0.818 ± 0.537

  

20–30

11.5 ± 5.79

0.611 ± 0.368

–

 

20-Sep

0–10

14.1 ± 4.39

0.688 ± 0.208

–

  

10–20

8.96 ± 3.43

0.472 ± 0.206

0.830 ± 0.662

  

20–30

10.0 ± 6.56

0.551 ± 0.404

–

  1. Values are averaged across cores collected from six polygons, (N = 6), including the four polygons used in this experiment. Uncertainty ranges are standard deviations.
  2. As described in the text, the warming plots received a low-level glucose addition in 2014, which could not be detected in soil carbon, nitrogen, microbial biomass or 13C that year or in 2015 when the warming experiment started.
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