CNC Report 08.26.24 8.5x11 - Flipbook - Page 53
Path to On-Site Sequestration
Process:
CO2 fixation g Biomass
Process:
CO2 fixation g Biomass g SOC (partial
decomposition) + Reduces Anaerobic
Decomposition as in landfills
Process:
CO2 fixation g Biomass
Aerobic Decomposition:
2CH2O + O2 g 2 CO2 + H2O
(most common in nature)
Anaerobic Decomposition:
2CH2O g CH4 + CO2
(1 kg of CH4 is equivalent to 25 kg CO2e)
Vegetation
Soil
soil component – large
soil depths when possible
More Dedicated Green
Spaces Carved
Out On-Site
(1) Roofs, (2) street
landscaping + street trees,
(3) empty lots temporarily
before development
(4) permanent infill lots
transformed into gardens/parks
Choose Local And High
Sequestration Species
Turfgrass: 3,600 lbs C / acre-yr
Switchgrass: 10,000 lbs C / acre-yr
Maple Trees: 13,740 lbs C / acre-yr
Sedum (Memphis perennial):
950 – 1270 gC/m²-yr
Sea Heath (hot, humid):
2.09 kg C / m²-yr etc.
Keep
Excavated Soil
For Use
on-site
Biochar
Occupy Urban
Brownfields
Calcium
availability too
Organic Waste Material
(from yard waste, leaf litter,
biodegradable municipal
waste, etc.)
Transition to
Permeable
Parking Lots
Pyrolysis Reaction
Maintain Minimal Soil
Disturbances & Planting
Rotations
(low temperature burning onsite supplied by yields from the
biochar – circular process)
Store in Ground
Can Store More When
Compost Added
(from yard waste, leaf litter, food)
104
196*
0.3*
lbs C sequestered/
acre-yr
lbs C sequestered/
acre-yr
Mt C sequestered
/Mt of dry biomass
* Tacoma reference.
Urban sequestration
amount is similar to no-till
agriculture rates
* Biomass quantity
depends on quantities
from the city and people
TOOLKIT | STREETS AND SITES FOR PEOPLE TOWARD A CARBON NEUTRAL CORRIDOR
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