Article Figures & Data
Figures
- Figure 1.
Sixteen Tasmanian blue gum (Eucalyptus globulus Labill.) and 5 Scotch elm (Ulmus glabra Huds.) were evaluated for decay in Burlingame, California. Trees were removed and sectioned following decay assessments.
- Figure 2.
Wood decay being evaluated by research team members using the Resistograph (M300) and the portable drill. Four drill operators provided decay assessments at 3 sites on each tree, while 2 Resistograph units were used.
- Figure 3.
A template was used on all trees to consistently mark the location of Resistograph and drill measurements. Wood between measurement sites was sectioned and used for density analyses.
- Figure 4.
Wood sections between Resistograph and drill test sites were measured for density and arranged in sequence (as they occurred in the tree) for visual inspection.
Tables
- Table 1.
Soundwood depth evaluations for blue gum and elm using the Resistograph. The depth of soundwood using the Resistograph was compared to that value determined by wood density measurements. Resistograph deviations from density measurements were placed in 3 categories: 0 to 5 cm, 6 to 10 cm, and 11 to 15 cm. Cases in the first category indicate very good agreement between the methods, while those in the second and third categories indicate lesser agreement. R1 = Resistograph 1, R2 = Resistograph 2. Values indicate the number of cases in each deviation class and the percentage in each category.
Species R1 % R2 % Mean (%) Blue gum Deviation group 0 to 5 cm 38 85 41 86 85.5 6 to 10 cm 5 11 5 10 10.5 11 to 15 cm 2 4 2 4 4 Total 45* 100 48 100 100 Elm Deviation group 0 to 5 cm 14 100 14 100 100 ↵* Only 45 readings are reported for R1 because 2 charts were excluded (interpretation of Resistograph chart was equivocal) and 1 chart was lost.
- Table 2.
Soundwood depth evaluations for blue gum and elm using the drill technique. The depth of soundwood using the drill was compared to that value determined by wood density measurements. Drill deviations from density measurements were placed in 3 categories: 0 to 5 cm, 6 to 10 cm, and 11 to 15 cm. Cases in the first category indicate very good agreement between the methods, while those in the second and third categories indicate lesser agreement. Dl = Drill 1, D2 = Drill 2, etc. Values in columns indicate the number of cases in each deviation class and the percentage in each category.
Species Dl % D2 % D3 % D4 % Mean (%) Blue gum Deviation group 0 to 5 cm 27 56 34 75 40 83 37 78 73 6 to 10 cm 8 17 6 13 5 11 4 8 12 11 to 15 cm 7 15 3 6 3 6 5 10 10 > 15 cm 6 12 3 6 0 0 2 4 5 Total 48 46* 48 48 Elm Deviation group 0 to 5 cm 10 72 11 79 12 86 12 86 81 6 to 10 cm 1 7 3 21 2 14 2 14 14 11 to 15 cm 1 7 0 0 0 0 0 0 2 > 15 cm 2 14 0 0 0 0 0 0 3 Total 14 14 14 14 ↵* Only 46 readings are reported because 2 drill charts were excluded (readings were equivocal).
- Table 3.
Correlations between depth of soundwood as determined from laboratory density determinations and depth of soundwood determined by the Resistograph and portable drill.
Test Correlation coefficient (r) Elm Blue gum Resistograph 1 0.993*** 0.982*** Resistograph 2 0.975*** 0.977*** Drill 1 0.344ns 0.729*** Drill 2 0.913*** 0.887*** Drill 3 0.972*** 0.930*** Drill 4 0.926*** 0.820***
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