table : area-carbon-pool-net-ecosystem-exchange-of-carbon-and-methane-emissions-from-wetlands-in-north-america

Area, Carbon Pool, Net Ecosystem Exchange of Carbon, and Methane Emissions from Wetlands in North America (a-c)

table 13.1


This table appears in chapter 13 of the Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report report.

Notes
(a) Positive emissions indicate net gains to the atmosphere, and negative emissions indicate net gains or sequestration into the ecosystem.
(b) Citations and assumptions in calculations are in the text of this chapter and in Appendices 13A, and 13B
(c) Key: C, carbon; NEE, net ecosystem exchange; CH4, methane; Pg C, petagrams of carbon; Tg C, teragrams of carbon.
(d) Includes freshwater and nontidal terrestrial wetlands. Accuracy of wetland area estimates: Canada: >66% (Tarnocai 2009), conterminous United States: >90% (Nichols 1994), Alaska: 95% (Clewley et al., 2015), Puerto Rico: >90% (Nichols 1994), Mexico: <75% (this report); see Appendix 13A, for more information.
(e) Includes soil and plant carbon; soil carbon accounts for approximately 93% of the total pool.
(f) Includes net exchange of CO2 from the wetland; it does not include lateral fluxes or CH4 fluxes.
(g) The values here are mean values plus or minus 2 times the standard errors to approximate the minimum and maximum values of a 95% confidence interval.
(h) E = 10x.

This table is composed of these arrays :
1068bc70 (7x8)
Wetland Type Aread (km^2) Carbon Pool (e) (Pg C) NEE (f) CH4 Emissions CH4 Emissions
Net Balance (Tg C per Year) (g) CH4-C (Tg C per Year) (g) CH4 (Tg per Year)
Canada Peatland Nonforested 415,450 37.8 –6.9 ± 3.5 9.4 ± 2.4 12.6
Canada Peatland Forested 703,785 76.7 –33.6 ± 5.9 6.3 ± 7.4 8.4
Canada Mineral Nonforested 103,932 9.5 –10.6 ± 7.2 2.7 ± 0.7 3.6
Canada Mineral Forested 268,337 5.1 –12.9 ± 6.8 7.2 ± 4.3 9.6
Total 1,491,504 129 –64.0 ± 12.0 25.6 ± 8.9 34.2
29f930d9 (7x8)
Wetland Type Aread (km^2) Carbon Pool (e) (Pg C) NEE (f) CH4 Emissions CH4 Emissions
Net Balance (Tg C per Year) (g) CH4-C (Tg C per Year) (g) CH4 (Tg per Year)
Conterminous United States Peatland Nonforested 42,903 3.9 –5.8 ± 3.6 1.0 ± 0.3 1.3
Conterminous United States Peatland Forested 40,823 4.4 –4.9 ± 3.8 0.4 ± 0.4 0.5
Conterminous United States Mineral Soil Nonforested 138,381 1.9 –14.1 ± 9.5 3.6 ± 1.0 4.8
Conterminous United States Mineral Soil Forested 173,091 3.3 –11.6 ± 8.2 4.7 ± 2.8 6.2
Total 395,197 13.5 –36.5 ± 13.6 9.6 ± 3.0 12.8
37887d0b (7x8)
Wetland Type Aread (km^2) Carbon Pool (e) (Pg C) NEE (f) CH4 Emissions CH4 Emissions
Net Balance (Tg C per Year) (g) CH4-C (Tg C per Year) (g) CH4 (Tg per Year)
Alaska Peatland Nonforested 73,836 5.5 –4.2 ± 4.7 1.7 ± 0.4 2.2
Alaska Peatland Forested 5,747 0.4 –0.3 ± 0.4 0.1 ± 0.1 0.2
Alaska Mineral Soil Nonforested 192,013 9.3 –10.9 ± 12.3 5.0 ± 1.4 6.7
Alaska Mineral Soil Forested 40,162 2 –2.3 ± 2.6 1.1 ± 0.6 1.4
Total 311,758 17.3 –17.6 ± 13.5 7.9 ± 1.6 10.5
4b0209ae (7x8)
Wetland Type Aread (km^2) Carbon Pool (e) (Pg C) NEE (f) CH4 Emissions CH4 Emissions
Net Balance (Tg C per Year) (g) CH4-C (Tg C per Year) (g) CH4 (Tg per Year)
Puerto Rico Peatland Nonforested 8 –0.003 ± 0.003 3.38E-04h ± 2.88E-04 0.0
Puerto Rico Peatland Forested 1 0.000 0.000 ± 0.000 2.68E-05 ± 2.28E-05 0.0
Puerto Rico Mineral Soil Nonforested 252 0.006 –0.030 ± 0.110 1.36E-02 ± 0.488E-02 0.0
Puerto Rico Mineral Soil Forested 50 0.001 –0.006 ± 0.022 2.70E-03 ± 0.966E-03 0.0
Total 311 0.008 –0.039 ± 0.110 1.67E-02 ± 0.500E-02 2.22E-02
58feee3e (7x8)
Wetland Type Aread (km^2) Carbon Pool (e) (Pg C) NEE (f) CH4 Emissions CH4 Emissions
Net Balance (Tg C per Year) (g) CH4-C (Tg C per Year) (g) CH4 (Tg per Year)
Mexico Peatland Nonforested 17,191 0.43 –5.33 ± 5.25 0.69 ± 0.59 0.9
Mexico Peatland Forested 3,394 0.24 –1.05 ± 1.04 0.14 ± 0.12 0.2
Mexico Mineral Soil Nonforested 10,320 0.35 –1.25 ± 4.51 0.56 ± 0.20 0.7
Mexico Mineral Soil Forested 5,288 0.16 –0.64 ± 2.31 0.29 ± 0.10 0.4
Total 36,193 1.17 –8.27 ± 7.37 1.67 ± 0.640 2.22
6770e1ab (7x8)
Wetland Type Aread (km^2) Carbon Pool (e) (Pg C) NEE (f) CH4 Emissions CH4 Emissions
Net Balance (Tg C per Year) (g) CH4-C (Tg C per Year) (g) CH4 (Tg per Year)
North America Peatland Nonforested 549,388 47.7 –22.2 ± 17.1 12.8 ± 3.7 17
North America Peatland Forested 753,749 81.8 –39.9 ± 11.0 6.9 ± 8.0 9.2
North America Mineral Soil Nonforested 444,898 21.1 –36.9 ± 33.6 11.9 ± 3.3 15.9
North America Mineral Soil Forested 486,928 10.4 –27.4 ± 19.9 13.3 ± 7.8 17.7
Total 2,234,963 161 –126.4 ± 23.8 44.8 ± 9.5 59.8
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