TreeLodi Shade Tree Program
Shade Tree Species
The species of shade trees TreeLodi has delivered to Lodi homes, season by season, and estimates of the carbon dioxide (CO2) those trees take out of the air and store in their wood.
Species delivered, all seasons
Species delivered this season
CO2 impact
Trees pull CO2 from the air as they grow and store the carbon in their trunks, branches and roots. These are model estimates from Forest Service measurements of street trees in Sacramento and Modesto, not measurements of TreeLodi's trees. Three ways of counting are shown so TreeLodi's arborists can recommend one.
Assumptions Pending arborist recommendation
CO2 for the season
CO2 absorbed by program trees, all seasons
Option C. Each season, every tree delivered in that season or earlier keeps growing. Bars show the CO2 those trees absorbed during the season; the line shows the total stored in all program trees at the end of the season.
Future CO2 storage
Option B. CO2 the trees would hold in their wood when they reach each age, for all trees delivered so far and for the selected season's trees.
Option D: the CUFR Tree Carbon Calculator
The arborist memo also listed the Forest Service Center for Urban Forest Research Tree Carbon Calculator (CTCC). California's Air Resources Board describes it as the only tool approved by the California Climate Action Registry Urban Forest Project Reporting Protocol (Cool California). The calculator is no longer offered: the Center for Urban Forestry Research has discontinued it, and NCASI provides copies on request (NCASI, 2024). The Forest Service's page for the tool has no download (Climate Change Resource Center).
The CTCC was a spreadsheet that took one tree at a time by species and trunk size or age. This page cannot run it. Options A, B and C use the Forest Service's Urban Tree Database, which publishes the reference-city street-tree measurements of the kind the CTCC was built on (Urban Tree Database). The current Forest Service tool for planting projects, i-Tree Planting, is entered by hand one species at a time and asks for a mortality rate (NCASI, 2024).
How the estimates are made
- Each species uses a growth curve (trunk diameter by age) from the Forest Service Urban Tree Database, Sacramento first, then Modesto (Urban Tree Database).
- Wood weight comes from the database's biomass equations. CO2 = dry weight × 1.28 (roots) × 0.5 (carbon share) × 3.67 (CO2 per unit of carbon) (Forest Service General Technical Report PSW-GTR-253, p. 73).
- Species the database did not measure use a stand-in: a measured species of the same genus and tree type, or the most-measured species of the same leaf type and mature height class. The Basis column names the stand-in.
- Option A: CO2 absorbed in one year once the trees reach age 10. Option B: CO2 stored at tree age 20 and 40. Option C: CO2 absorbed during each season by every program tree in the ground. Absorption in a year is the stored amount at that age minus the stored amount a year earlier.
- Survival: "Sacramento rate" keeps 96.2% of trees each year, the rate measured in a 22-year follow-up of Sacramento's shade tree program (Forest Service, Sacramento Shade monitoring).
- Tree age at delivery: age 0 counts the season of delivery as the tree's first year of growth. Nursery trees are usually older; a higher age gives larger yearly numbers.
- Estimates stop at the oldest age measured for the growth species (40 years at most). Palms, shrub-form plants and records named only by genus have no estimate.
- 1 metric ton = 2,204.6 lb.