Equations For Wetlands

Equation 7.1 CO2 EMISSIONS FROM WETLANDS

Where:

CO2_W = CO2 emissions from Wetlands, Gg CO2 yr-1

CO2_Wpeat = CO2 emissions from peatlands managed for peat production, Gg CO2 yr-1 CO2_Wflood = CO2 emissions from (lands converted to) Flooded Land, Gg CO2 yr-1

Equation 7.2

CO2 EMISSIONS IN PEATLANDS DURING PEAT EXTRACTION

C°2WWrell = (C°2 CwWpeat0jf-site + ^ ^^^n-stte ^ ' ^^^

Where:

CO2 WWpeat = CO2 emissions from land undergoing peat extraction, Gg CO2 yr-1

CO2-CWW peatoff site = off-site CO2-C emissions from peat removed for horticultural use, Gg C yr-1

CO2-Cwwpeat on = on-site CO2-C emissions from drained peat deposits, Gg C yr"

Equation 7.3 CO2 -C EMISSIONS FROM MANAGED PEATLANDS (TIER 1)

2 WWpeat 2 peatoff -site 2 WWPeaton-site

Where:

CO2-CWWpeat = CO2 -C emissions from managed peatlands, Gg C yr-1

CO2-C WW peat on = on-site emissions from peat deposits (all production phases), Gg C yr-1

CO2-C WW peat off ite = off-site emissions from peat removed for horticultural use, Gg C yr-1

Equation 7.4

On-site soil CO2-C emissions from managed peatlands (Tier 1)

z " " peaton-site

(ApeatRich • EFcO2peaRich ) + (ApeatPoor • EFCO2pealPc»r )

peatB

CO2-C ww peat t = on-site CO2—C emissions from peat deposits (all production phases), Gg C yr ApeatRich = area of nutrient-rich peat soils managed for peat extraction (all production phases), ha ApeatPoor = area of nutrient-poor peat soils managed for peat extraction (all production phases), ha EFCO2peatRich = CO2 emission factors for nutrient-rich peat soils managed for peat extraction or abandoned after peat extraction, tonnes C ha-1 yr-1 EFCO2peatPoor = CO2 emission factors for nutrient-poor peat soils managed for peat extraction or abandoned after peat extraction, tonnes C ha-1 yr-1

ACWW peat B = CO2-C emissions from change in carbon stocks in biomass due to vegetation clearing, Gg C

yr-1

ACWW peat B = CO2-C emissions from change in carbon stocks in biomass due to vegetation clearing, Gg C

yr-1

Where:

CO2-C WW peat = off-site CO2-C emissions from peat removed for horticultural use, Gg C yr-1 Wtdry_peat = air-dry weight of extracted peat, tonnes yr-1 Voldry_peat = volume of air-dry peat extracted, m3 yr-1

Cfractionwt_ peat = carbon fraction of air-dry peat by weight, tonnes C (tonne of air-dry peat)-1 Cfractionvol_peat = carbon fraction of air-dry peat by volume, tonnes C (m3 of air-dry peat)-1

Equation 7.6

On-site CO2-C emissions from managed peatlands (Tiers 2 and 3)

pc^conversion Pz^extracüon

^ ^ ™ ^stockpiling Peatpost J

2 WWpeaton -site

CO2—CWW peat . = on-site CO2-C emissions from peat deposits, Gg C yr-

Where:

CO2—CWW peat . = on-site CO2-C emissions from peat deposits, Gg C yr-

CO2-CWW peat = on-site CO2-C emissions from lands conversion for peat extraction, Gg C yr-1

conversion

CO2-CWW peat , = CO2-C emissions from the surface of peat extraction area, Gg C yr-1

CO2 CWW peat . ,•,• = CO2-C emissions from peat stockpiles prior to off-site removal, Gg C yr-CO2—CWW peat . = CO2-C emissions from soils of abandoned, cut-over peatlands, Gg C yr"

CO2 CWW peat . ,•,• = CO2-C emissions from peat stockpiles prior to off-site removal, Gg C yr-CO2—CWW peat . = CO2-C emissions from soils of abandoned, cut-over peatlands, Gg C yr"

N2OWWpeat Extraction = direct N2O emissions from peatlands managed for peat extraction, Gg N2O yr-1

Where:

N2OWWpeat Extraction = direct N2O emissions from peatlands managed for peat extraction, Gg N2O yr-1

ApeatRich = area of nutrient-rich peat soils managed for peat extraction, including abandoned areas in which drainage is still present, ha

EFN O-N = emission factor for drained nutrient-rich wetlands organic soils, kg N2O-N ha-1 yr-1

2 peat Rich

EFN O-N = emission factor for drained nutrient-rich wetlands organic soils, kg N2O-N ha-1 yr-1

2 peat Rich

Where:

CO2-CLWpeat_on-site = CO2-C emissions from land being converted for peat extraction, Gg C yr-1 ACWWpeat B = CO2-C emissions from change in carbon stocks in living biomass, Gg C yr-1 ACWWpeatDQM = CO2-C emissions from change in carbon stocks in dead organic matter pool, Gg C yr-1

CO2-CLWpeat drainage = CO2-C emissions from soils during drainage, Gg C yr-1

Equation 7.9

CO2 -C EMISSIONS FROM SOILS IN PEATLAND BEING DRAINED FOR PEAT EXTRACTION

\Adrained peatRich • FFCO2drained peatRich / + / \

^ peat _ lainage

\Adrained peatPoor • FFCO2drained peatFoor /

1000

CO2-CLW peat _drajnage = CO2-C emissions from soils on lands converted for peat extraction, Gg C yr-1

Adrained

Where:

CO2-CLW peat _drajnage = CO2-C emissions from soils on lands converted for peat extraction, Gg C yr-1

Adrained peatRich = area of nutrient-rich peat soils being dl^d, ha

Adrajned peatPoor = area of nutrient-poor peat soils being drained, ha

EFCo2dramed peatRich = emission factors for CO2-C from nutrient-rich peat soils being drained, tonnes C

EFCO2 drained peatpoor = emission factors for CO2-C from nutrient-poor peat soils being drained, tonnes C

h2a-1 yr-1 Poor

Equation 7.10

Annual change in carbon stocks in living biomass on land converted to

PERMANENTLY FLOODED LAND

ACLWfloodIB —

2 Ai • (BAfteri BBeforei ) i

• CF

ACLWfloodiS • 12

ACLwfiood = annual change in carbon stocks in biomass on Land Converted to Flooded Land, tonnes C

Where:

ACLwfiood = annual change in carbon stocks in biomass on Land Converted to Flooded Land, tonnes C

yr-1

A. = area of land converted annually to Flooded Land from original land use i, ha yr-1

BAfter. = biomass immediately following conversion to Flooded Land, tonnes d.m. ha-1 (default = 0)

BBefore. = biomass in land immediately before conversion to Flooded Land, tonnes d.m. ha-1

CF = carbon fraction of dry matter (default = 0.5), tonnes C (tonne d.m.)-1

CO2 LWflood = annual CO2 emissions on Land Converted to Flooded Land, tonnes CO2 yr-1

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