Table 2.

Coefficients of determination (R²) for species-specific regression equations fitting aboveground woody carbon and basal area to topographic, vegetation, soil and landscape variables (see methods)

Biomass Ranking	Species	Carbon - R2	Basal Area - R2
1	Quercus kelloggii	0.203	0.262*
2	Q. wislizenii	0.103	0.118
3	Q. lobata	0.143	0.176
4	Q. douglasii	0.385***	0.379***
5	Arbutus menziesii	0.279**	0.300**
6	Acer negundo	0.307**	0.359***
7	Populus species	0.307**	0.350***
8	Salix species	0.515***	0.538***
9	Umbellularia californica	0.113	0.119
10	Q. species	0.103	0.069
11	Q. chrysolepis	0.217	0.221*
12	Pseudotsuga menziesii	0.051	0.079
13	Aesculus californica	0.186	0.186
14	Alnus rhombifolia	0.278**	0.310**

p-values: * < 0.05; ** < 0.01; *** < 0.001

Listed by rank are the 14 tree species that contribute most to total aboveground woody biomass estimated for sample plots in wildlands surrounding vineyards on five ranches in Mendocino County, California.