International Journal of Forestry Research / 2016 / Article / Tab 2

Research Article

Bark Thickness Equations for Mixed-Conifer Forest Type in Klamath and Sierra Nevada Mountains of California

Table 2

Comparison of bark thickness (BT; mm) as a function of DBH (cm) across latitudinal gradient (north, central, and south) and among crown classes (dominant, codominant, intermediate, and suppressed) for red fir (ABMA) and white fir (ABCO) at Klamath National Forest (KNF), Tahoe National Forest (TNF), and Sequoia National Forest (SNF). Coefficients and fit statistics for region and crown class dummy variable (d) in nonlinear regression.

SpeciesRegion/crown classCoefficient (d)s.e.Appr. 95% confidence limits
LowerUpper

ABMA ()
(RMSE = 6.22 mm)North (KNF)0.8750.0320.8120.938
Central (TNF)0.9410.0310.8801.003
South (SNF)0.9170.0300.8580.976

(RMSE = 6.75 mm)Dominant0.9640.0420.8811.047
Codominant0.9730.0510.8721.074
Intermediate1.0120.0590.8961.128
Suppressed1.0410.0680.9061.176

ABCO ()
(RMSE = 6.15 mm)North (KNF)0.8560.0560.7450.967
Central (TNF)0.8880.0290.8310.945
South (SNF)0.8650.0280.8100.921

(RMSE = 6.20 mm)Dominant0.9240.0360.8530.995
Codominant0.9470.0430.8611.033
Intermediate0.9640.0510.8631.065
Suppressed0.9960.0600.8771.116