Species specific mean live tree carbon stocks varied as a function
of GCM and emission scenario projection (Tables 1 and 2).
White fir and ponderosa pine are the dominant species on the west
and east sides of the Basin, respectively, and had the largest
changes in live tree carbon stocks of the five species modeled.
Mid-century, both white fir and ponderosa pine had declines in live
tree carbon, relative to the baseline, for GFDL-A2 and PCM1-A2.
During the same period, both species had increases, relative tobaseline, for PCM1-B1 and CNRM-A2. The increases for CNRM-A2
were the largest mid-century, ranging from 4.43 to 8.99 Mg C ha1
for white fir and 9.52 to 10.49 Mg C ha1 for ponderosa pine
(Table 1). GFDL-B1 had declines in mid-century live tree carbon
for the two fir species and incense-cedar, while both pine species
had increases in live tree carbon (Table 1). By late-century, both
white fir and ponderosa pine showed declines in live tree carbon
for GFDL and PCM1 under the B1 emission scenario; yet under
the A2 emission scenario, white fir live tree carbon increased under
both GCMs and ponderosa pine declined. The mid-century increases
in live tree carbon for both species under CNRM-A2 both
became small decreases in live tree carbon, relative to baseline,
by late-century. Given the limited contribution to total basal area,
in general the changes from baseline were much smaller for red fir,
incense-cedar, and sugar pine (Tables 1 and 2). In most cases, red
fir and incense-cedar live tree carbon stocks tended to decrease relative
to baseline and sugar pine tended to increase regardless of
GCM, emission scenario, or time period