Table 1 Effect of N subsidies on cumulative net N mineralization (NetNMin), and C sequestration in forest vegetation (VegCNEW) and soils (TotSOCNEW) over the 21st century

From: Future nitrogen availability and its effect on carbon sequestration in Northern Eurasia

Factor

RCP8.5

RCP4.5

 

NetNMin (Tg N)

VegCNEW (Pg C)

TotSOCNEW (Pg C)

NetNMin (Tg N)

VegCNEW (Pg C)

TotSOCNEW (Pg C)

Permafrost

 Degradationa

   Young forests

84

2.3

−1.6

32

0.3

−1.4

   Old forests

110

3.9

−11.0

112

3.3

−10.7

   All forests

194

6.2

−12.6

144

3.6

−12.1

Cropland

 Abandonmentb

   Unfertilized

     Young forests

32

1.2

0.3

318

11.6

2.3

     Old forests

0

0.0

0.0

0

0.0

0.0

     All forests

32

1.2

0.3

318

11.6

2.3

  Pre-2001

    Young forests

17

0.1

−0.2

77

0.9

−0.5

    Old forests

0

0.0

0.0

0

0.0

0.0

    All forests

17

0.1

−0.2

77

0.9

−0.5

   Post-2000

    Young forests

8

0.0

0.0

145

0.5

−2.3

    Old forests

0

0.0

0.0

0

0.0

0.0

    All forests

8

0.0

0.0

145

0.5

−2.3

  Total

    Young forests

57

1.3

0.1

540

13.0

−0.5

    Old forests

0

0.0

0.0

0

0.0

0.0

    All forests

57

1.3

0.1

540

13.0

−0.5

Pasture

 Abandonmentb

   Young forests

41

1.8

0.4

235

8.5

1.8

   Old forests

0

0.0

0

0

0.0

0.0

   All forests

41

1.8

0.4

235

8.5

1.8

Atmospheric N

 Depositionc,d

   Young forests

16

1.2

0.2

28

0.8

0.3

   Old forests

98

2.9

1.3

89

1.9

1.1

   All forests

114

4.1

1.5

117

2.7

1.4

Total N Subsidiesd

  Young forests

198

6.6

−0.9

835

22.6

0.2

  Old forests

208

6.8

−9.7

201

5.2

−9.6

  All forests

406

13.4

−10.6

1036

27.8

−9.4

Enhanced

 Metabolisme

   Young forests

1935

13.7

−3.4

1593

5.7

0.6

   Old forests

2650

24.8

3.8

2598

15.5

9.0

   All forests

4585

38.5

0.4

4191

21.2

9.6

Total

  Young forests

2133

20.3

−4.3

2428

28.3

0.8

  Old forests

2858

31.6

−5.9

2799

20.7

−0.6

  All forests

4991

51.9

−10.2

5227

49.0

0.2

  1. aResponses based on the differences in TEM estimates described in the Permafrost degradation section of Methods
  2. bResponses based on the differences in TEM estimates described in the Land-use legacies including fertilizer applications section of Methods
  3. cResponses based on the differences in TEM estimates described in the Atmospheric N deposition section of Methods.
  4. dEstimates for VegCNEW and TotSOCNEW also include the effects of the direct inputs from atmospheric N deposition in addition to the N deposition-enhanced net N mineralization
  5. eEstimates include the effects of climate change and land-use change on N recycling from enhanced metabolism of vegetation and microbes
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